CSM_CJ1W-SCU_DS_E_7_1
1
CJ-series Serial Communications Units
CJ1W-SCU
The Serial Communications
Units That Enable High-speed
Connections with External
Devices
• Each Serial Communications Unit provides two
serial communications ports: RS-232C and
RS-422A/485, and the serial communications
mode can be set separately for each port from
Protocol Macro, Host Link, NT Link, Serial
Gateway, and No-protocol.
Features
•Mount a total of up to 16 CPU Bus Units, including these Serial Communications Units, to the CPU Rack or Expansion Racks to create systems
with up to 32 serial communications ports.
•Connect an NT-AL001 RS-232C/RS-442A Link Adapter to the RS-232C port to enable 1:N communications.
•With the CJ1W-SCU@2, you can use a faster baud rate (up to 230.4 kbps) and faster data transfer to the CPU Unit to enable connecting to
high-speed external devices.
System Configuration
CJ1W-SCU32 CJ1W-SCU42CJ1W-SCU22
Host Computer
or
Serial Communications Units
RS-232C/RS-422A Adapter
NT-AL001
Protocol Macro
General-purpose External Device
General-purpose External Device
Modbus-RTU Master
(Host computers)
No-protocol
Serial Gateway
(Host Link(FINS))
Serial Gateway
(Compoway/F)
Temperature Controller
Smart Sensor
CPU Unit
Programmable Terminal (PT)
Programing Devices
CJ-series
Controller
(Host Link slave)
2
CJ1W-SCU
Ordering Infomation
International Standards
•The standards are abbreviated as follows: U: UL, U1: UL(Class I Division 2 Products for Hazardous Locations), C: CSA, UC: cULus, UC1: cULus (Class I Division
2 Products for Hazardous Locations), CU: cUL, N: NK, L: Lloyd, and CE: EC Directives.
•Contact your OMRON representative for further details and applicable conditions for these standards.
*1. When an NT-AL001 RS-232C/RS-422A Conversion Unit is used, this value increases by 0.15 A/Unit.
*2. Sinple Backup Function and Interrupt notification function cannot be used with an NJ-system.
*3. A Serial Communications Unit with unit version 2.1 or later, a CPU Unit with unit version 1.03 orlater, and Sysmac Studio version 1.04 or higher
are required to use the SerialRcvNoClear instruction.
*4. You can activate Protocol macro trace function when the CPU Unit is set to the RUN/MONITOR mode. (MONITOR mode is not available with
the NJ-series CPU Units.)
*5. The Serial Gateway function is enabled only for Serial Communications Units of unit version 1.2 and later.
*6.
The no-protocol function is enabled only for Serial Communications Units of unit version 1.2 and later (and a CPU Unit of unit version 3.0 or later is also required).
*7. The Modbus-RTU Slave function is enabled only for Serial Communications Units of unit version 1.3 and later.
*8. This unit cannot be used, with the Machine Automation Controller NJ-series.
Accessories
Mountable Racks
Note: It may not be possible to mount this many Units to a Rack depending on the current consumption of the other Units.
*1. This is the number of Units for a CJ2H-CPU6@ CJ2H CPU Unit (without EtherNet/IP) and a CJ1W-PA205@ or CJ1W-PD025 Power Supply
Unit. (When not using NT-AL001)
*2. This is the number of Units for a CJ1W-PA205@ or CJ1W-PD025 Power Supply Unit.
*3. A CP1W-EXT01 CJ Unit Adaptor is required
*4. A total of up to 16 Units, including all other CPU Bus Units.
Unit type Product name
Specifications No. of unit
numbers
allocated
Current
consumption (A)
Model
Standards
Communications
Interface Communications functions 5V 24V
CJ1 CPU
Bus Units
Serial
Communications
Units
2 RS-232C ports
The following functions can be
selected for each port with an CJ-
system:
• Protocol macro
• Host Link
• NT Links (1:N mode)
• Serial Gateway
• No-protocol *3
• Modbus-RTU Slave
The following functions can be
selected for each port with an NJ-
system:
• Protocol macro
• Serial Gateway
• No-protocol
• Modbus-RTU Slave
1
0.28
*1 —CJ1W-SCU22 *2
UC1, N,
L, CE
2 RS-422A/485 ports 0.40 — CJ1W-SCU32 *2
1 RS-232C port and
1 RS-422A/485 port
0.36
*1 —CJ1W-SCU42 *2
CJ1 CPU
Bus Units
Serial
Communications
Units
2 RS-232C ports
The following functions can be
selected for each port:
• Protocol macro *4
• Host Link
• NT Links (1:N mode)
• Serial Gateway *5
• No-protocol *6
• Modbus-RTU Slave *7
1
0.28
*1 —CJ1W-SCU21-V1 *8
UC1, N,
L, CE
2 RS-422A/485 ports 0.38 — CJ1W-SCU31-V1 *8
1 RS-232C port and
1 RS-422A/485 port
0.38
*1 —CJ1W-SCU41-V1 *8
Model Accessories Specifications
CJ1W-SCU22 2 Serial Port (RS-232C) Connector Connector set for serial port connection (D-SUB 9-pin male connector)
CJ1W-SCU32 2 Serial Port (RS-422A/485) Connector Terminal Block Connector (FMC1.5/5-STF-3.5AU by Phoenix Contact)
CJ1W-SCU42 1 Serial Port (RS-232C) Connector Connector set for serial port connection (D-SUB 9-pin male connector)
1 Serial Port (RS-422A/485) Connector Terminal Block Connector (FMC1.5/5-STF-3.5AU by Phoenix Contact)
CJ1W-SCU21-V1
CJ1W-SCU31-V1
CJ1W-SCU41-V1
2 Serial Port (RS-232C) Connector Connector set for serial port connection (D-SUB 9-pin male connector)
Model
NJ system CJ system (CJ1, CJ2) CP1H system NSJ system
CPU Rack *4Expansion
Rack *4CPU Rack Expansion
Backplane CP1H PLC NSJ
Controller
Expansion
Backplane
CJ1W-SCU22 Unit version 2.0
10 Units
10 Units
(per Expansion
Backplane)
10 Units *1
10 Units *2
(per Expansion
Backplane)
2 Units *3 Not supported
10 Units *2
(per Expansion
Backplane)
CJ1W-SCU32 Unit version 2.0
CJ1W-SCU42 Unit version 2.0
CJ1W-SCU21-V1 Unit version 1.3
Not supported
CJ1W-SCU31-V1 Unit version 1.3
CJ1W-SCU41-V1 Unit version 1.3
High-speed type
CJ1W-SCU
3
Specifications
*1. Serial Gateway: The Serial Gateway can also be executed in protocol macro mode.
*2. No-protocol: An external interrupt task can be executed when data is received in No-protocol Mode. If the CJ2H CPU Units with unit version
1.1 or later and CJ2M CPU Units is used, the high-speed communications instructions (DRXDU(261) and DTXDU(262)) can also be used.
*3. The current consumption is for one Serial Communications Unit. When an NT-AL001 Link Adapter is connected to the Serial Communications
Unit, power is supplied to the Link Adapter from the Unit. A current consumption of 0.15A must be added for each Link Adapter that is
connected. In the above specifications, “x” indicates that 0.15A must be added for each port to which an NT-AL001 Link Adapter is connected
to provide the required 5-V power supply.
Item Description
Device name Serial Communications Unit
Classification CPU Bus Unit
Model number CJ1W-SCU22 CJ1W-SCU32 CJ1W-SCU42 CJ1W-SCU21-V1 CJ1W-SCU31-V1 CJ1W-SCU41-V1
Serial ports Port 1 RS-232C RS-422A/485 RS-422A/485 RS-232C RS-422A/485 RS-422A/485
Port 2 RS-232C RS-422A/485 RS-232C RS-232C RS-422A/485 RS-232C
Protocol
Port 1 Host Link, protocol macro, Serial Gateway, No-protocol, NT Link,
Modbus-RTU Slave, loopback test , or 1:1 Host Link can be se-
lected for each port. *1 *2
Host Link, protocol macro, NT Link, or loopback test can be
selected for each port.
• Unit Ver. 1.2 or later also supports Serial Gateway, no-proto-
col, and 1:1 Host Link modes. (Note: The Serial Gateway can
also be executed in protocol macro mode.) *1
• Unit Ver. 1.3 or later also supports Modbus-RTU slave mode.
Port 2
Number of
mountable
Units
CPU Unit None
CPU Rack A total of up to 16 Units, including all other CPU Bus Units. No
restrictions on the mounting location.
However, if an external interrupt task is used, the Unit must be
mounted in one of the following slots on the CPU Rack.
• CJ2H-CPU6@-EIP CPU Unit: Slots 0 to 3
• CJ2H-CPU6
@
, CJ2M-CPU
@@
or CJ1G/H-CPU
@@
H CPU Unit:
Slots 0 to 4
• CJ1M-CPU@@ CPU Unit: Slots 0 to 2
External interrupt tasks will not be started if the Unit is mounted to
any other slot.
A total of up to 16 Units, including all other CPU Bus Units. No
restrictions on the mounting location.
Expansion
Rack
Data exchange
with the CPU Unit
Ordinary
refreshing
of software
switches
and status
Allocated 25 words of the 25 words in the CPU Bus Unit CIO Area (constant data exchange with the CPU Unit)
Transfer
from the
CPU Unit
set by the
system
Of the CPU Bus Unit DM Area, each serial port is allocated 10 words (total 20 words).
Data is transferred from the CPU Unit at the following times:
• Startup or restart
• Ladder instruction: STUP(237)
• Port Settings Changing Flag turns ON (Auxiliary Area)
Simple Backup Function
The CPU Unit’s Simple Backup Function can be used to backup the Protocol Macro data in the Serial Communications Unit to the
CPU Unit’s Memory Card. The backed-up data can be restored or compared.
(The Simple Backup Function can be used with the CJ1-H and CJ1M CPU Units only.)
Current consumption *3280mA+x 400mA 360mA+x 280mA+x 380mA 380mA+x
Weight 160g Max. 120g Max. 140g Max. 110g Max. 110g Max. 110g Max.
General specifications Conforms to general specifications for CJ Serise.
4
CJ1W-SCU
Protocol Specifications
Host Link Specifications
*1. Confirm the baud rates and communications distance supported by connected devices.
*2. The CJ1W-SCU@2 is required for communications at 230,400 bps.
*3. The maximum cable length for RS-232C is 15 m. The RS-232C standard, however, does not cover baud rates above 19.2 Kbps. Refer to the
manual for the device being connected to confirm support.
*4. The specified frame format must be prepared on the host computer and then sent.
*5. The host computer must interpret the commands and return a response in the correct format.
Connection between the host computer and Controller must be 1:1.
Protocol Macro Function Specifications
Item Description
Communications mode Half-duplex (Full-duplex for slave-initiated communications)
Synchronous mode Start-stop synchronization (asynchronous mode)
Baud rate *1
RS-232C port and RS-422A/485 ports:
1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps *2
Default setting: 9,600 bps
Communications distance
*1
RS-232C port : 15 m max. *3
RS-422A/485 Port :
• CJ1W-SCU@1-V1
500 m max. (total cable length: 500 m max., T-branch branch lines: 10 m max.)
• CJ1W-SCU@2
1,200 m max. (total cable length: 1,200 m max., Multidrop connections are possible. However, maximum cable length is 500 m if
the NT-AL001 is used for RS-422A-485 connections.)
Connection configuration RS-232C port : 1:1 (1:N (N = 32 Units max.) is possible using an Converting Link Adapters.)
RS-422A/485 port : 1:N (N = 32 Units max.)
Number of connected Units 32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connection)
Frame structure
C-mode commands Header: @, address: (host link unit number) 0 to 31 (BCD), data: header code + text, error check
code: FCS, terminator: * +CR
FINS commands Header: @, address: (host link unit number) 0 to 31 (BCD), data: header code (always “FA”) + FINS
header + FINS command + text, error check code: FCS, terminator: * +CR
Error check codes Vertical parity: Even, odd. or none
FCS (horizontal parity converted to ASCII)
Command flow and support
Command flow Commands Contents
Host computer to Controller
C-mode commands 1:1 or 1:N communications with directly connected Controller *4
FINS commands
(in Host Link protocol) 1:1 or 1:N communications with directly connected Controller.
Controller to host computer FINS commands
(in Host Link protocol)
Communications using SEND(090), RECV(098), and CMND(490) from CPU
Unit. *5
Item Description
Number of protocols 20 max. Can be created and registered with the Protocol Support Tool (CX-Protocol).
Number of sequences 1,000 max.
Per protocol
Number of sequences 60 max.
Number of messages 300 max.
Number of reception
matrixes 100 max.
Sequence execution condition Using the CPU Unit’s PMCR (260) instruction (specifying the sequence number)
Communications mode Half-duplex or full-duplex
Synchronous mode Start-stop synchronization (asynchronous mode)
Baud rate *1
RS-232C port and RS-422A/485 ports:
1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps
Default setting: 9,600 bps *2
Communications distance *1
RS-232C port : 15 m max.
RS-422A/485 port :
• CJ1W-SCU@1-V1
500 m max. (total cable length: 500 m max., T-branch branch lines: 10 m max.)
• CJ1W-SCU@2
1,200 m max. (total cable length: 1,200 m max., Multidrop connections are possible. However, max-
imum cable length is 500 m if the NT-AL001 is used for RS-422A-485 connections.)
Connection configuration RS-232C port : 1:1 (1:N (N = 32 Units max.) is possible using a Converting Link Adapter.)
RS-422A/485 port : 1:N (N = 32 Units max.)
Number of connected Units 32 Units max. (unit numbers 0 to 31; unit number 0 is set for 1:1 connection)
Maximum number of data
exchange words between
Controller and protocol
macro function
Operand setting 250 words Including the word that specifies the number of
words (1 word)
Link word setting 500 words O1, O2, I1, and I2: 500 words total
Direct setting 500 words Maximum number of words per data attribute
CJ1W-SCU
5
Sequence contents
(step common parameters)
Number of steps per
sequence 16 max.
Transmission control
parameters
X-on/X-off flow, RS/CS flow, delimiter control, or contention control, and modem control can be
selected.
Response notification
method (operand)
Scan notification: Writes the receive data to I/O memory during CPU Unit scanning.
Scan method (fixed) Support
Interrupt notification Not support
Interrupt notification for reception case number Not suppprt
Monitoring time during
send/receive processing
Receive wait, receive completion, or send completion can be monitored.
Setting range: 0.01 to 0.99 s, 0.1 to 9.9 s, 1 to 99 s, or 1 to 99 minutes
Link word setting
Area in which data is exchanged between the CPU Unit and the Serial Communications Unit during
Communications Unit refreshing.
Two areas are possible for each device: An area for storing receive data and an area for storing send
data. *3
Step contents
Commands Send only (SEND), receive only (RECV), send and receive (SEND&RECV), wait (WAIT), reception
buffer clear (FLUSH), ER-ON (OPEN), or ER-OFF (CLOSE)
Repeat counter 1 to 255 times
Retry count 0 to 9 (Only when the command is SEND&RECV)
Send wait time 0.01 to 0.99 s, 0.1 to 9.9 s, 1 to 99 s, or 1 to 99 minutes
(Only when the command is SEND or SEND&RECV)
With or without response
write (operand)
When receive processing is completed (when the receive data is stored in the area specified in the
4th operand of the PMCR(260) instruction), whether or not to store the received messages can be
selected.
Next processing
When a step has ended normally, End (sequence completed), Next (proceed to the next step No.),
Goto (go to the specified step No.), or Abort (interrupt the step and terminate that sequence) can be
selected.
Error processing When a step has ended abnormally, End, Next, Goto, or Abort can be selected.
Send message Data sent to the specified address when the
command is SEND or SEND&RECV. Consists of a header, address, length, data,
error check code, and terminator.
Receive message Data sent from the specified address when the
command is RECV or SEND&RECV.
Reception matrix
When the command is RECV or SEND&RECV,
sets the expected receive messages (15 max.),
and switches to the next processing according to
the message received.
Specifies the receive messages and the next
processing for each of cases No. 00 to No. 15.
Of the maximum 16 cases, one case must be
set as “Other” in the receive messages (in
addition to the set receive messages).
Message unit contents
Header and
terminator data
attributes
Con-
stant ASCII data, hexadecimal data, or control code
Data attributes of
addresses and data
in send/receive
messages
Con-
stant ASCII data, hexadecimal data, or control code (with an address, no control code is possible)
Vari-
able
No conversion, conversion to ASCII data, or conversion to hexadecimal data
(the read/write direction can be specified)
Designa-
tion
method
(X, Y)
X: Effective address (where read from, or where written to)
Y: Data size (1 to 1,000) *4
X
Word
designation
Word read
(I/O memory to send
data)
Specify using the
3rd operand of the
PMCR(260) instruction.
Set leading address + n
(The linear expression
aN + b, including
repeat counter N, is
also possible for n.)
Specify using a link
word.
I/O memory direct
designation
Word write
(receive data to I/O
memory)
Specify using the
4th operand of the
PMCR(260) instruction.
Specify using a link
word.
I/O memory direct
designation
Wild card * Any data or address can be received
(only in receive messages)
Repeat
counter N
Item Description
6
CJ1W-SCU
*1. The baud rate and the communications distance sometimes depend on the remote device.
*2. A baud rate of 57,600 bps can be selected when using Unit Ver. 1.2 or later (115,200 bps is not possible). The CJ1W-SCU@2 is required for
communications at 115,200 or 230,400 bps.
*3. Unit Ver. 1.2 or later supports continuous I/O refreshing in addition to the previous on-request I/O refreshing.
*4. The data size is the number of bytes on the transmission path.
*5. The CX-Protocol can be used to register up to 96 attributes per message.
*6. A macro syntax error will occur when the protocol macro is executed if more than 31 write attributes are registered in one message.
*7. The CPU Unit is set to the RUN/MONITOR mode. (MONITOR mode is not available with the NJ-series CPU Units.)
Note: When using 2-wire RS-422A/485 communications in Protocol Macro Mode, set only modem controls for the send control parameters,
and do not use RS/CS flow controls.
Serial Gateway Specifications
*1. The reception buffer is cleared during Serial Gateway execution.
The Serial Gateway can be prohibited in protocol macro mode by turning ON the Serial Gateway Prohibit Switch in the CIO Area.
*2. When a timeout occurs, the FINS end code (0205 hex: Response timeout) is returned to the source of the FINS command and a response is
received after a timeout occurs.
*3. When a timeout occurs, the FINS end code (0204 hex: Remote node busy) is returned to the source of the FINS command. The send
processing will not be executed and the received FINS command will be discarded.
Message unit contents
Data attributes of
addresses and data
in send/receive
messages
Vari-
able Y
Linear expres-
sion including
repeat counter
aN+b a: 0 to 1000; b: 1 to 1000
N: Repeat counter value
Wild card * Can be received regardless of the length
(only in receive messages)
Word designa-
tion
Word read
(I/O memory to send
data)
Specify using the
3rd operand of the
PMCR(260) instruction. Set leading address + n
(The linear expression
aN + b, including
repeat counter N, is
also possible for n.)
Specify using a link
word.
I/O memory direct
designation
Error check codes LRC, LRC2, CRC-CCITT, CRC-16, SUM, SUM1, and SUM2 can be calculated.
Maximum length of
send/receive messages 1,000 bytes. (A maximum length between 200 and 1,000 bytes can be set in the Setup Area.)
Maximum number of data
attributes registered in one
message
96 attributes *5
Maximum number of write
data attributes registered in
one message
30 attributes *6
Trace function *7
• A total of up to 1,700 bytes (characters) of time-series data can be traced in send and receive
messages.
• Changes to the step No. and control signals such as RS and CS can also be traced.
Item Description
Conversion source FINS commands (received through network (including Host Link FINS) or CPU bus)
Conversion functions
• The received FINS command sent to the Unit’s serial port is converted according to the FINS command code as follows:
2803 hex: FIN header removed and converted to Compo-Way/F command.
2804 hex: FIN header removed and converted to Modbus-RTU command.
2805 hex: FIN header removed and converted to Modbus-ASCII command.
The converted command is sent to the serial port.
• When the received FINS command is sent to the Unit (user-specified FINS command code), the FINS command is enclosed
in a Host Link header and terminator.
Converted format
• CompoWay/F commands
• Modbus-RTU commands
• Modbus-ASCII commands
• Host Link FINS commands
Enabled serial
communications mode Serial Gateway mode or protocol macro mode
Queuing functions Up to five FINS commands can be converted and then queued for processing.
Protocol macro execution
processing
When a FINS command is received during protocol macro execution, the Serial Gateway is executed using an interrupt between
steps in the communications sequence. If the next step is a RECEIVE command, the Serial Gateway will not be executed until the
next step. For other conditions, the interrupt is executed immediately. *1
Response timeout
monitoring
The time is monitored from when the message is converted into the specified protocol using the Serial Gateway until the response is
received (in Serial Gateway mode or protocol macro mode).
Default: 5 s (setting range: 0.1 to 25.5 s) *2
Send start timeout
monitoring
The time is monitored from when the FINS command is received until it is converted into the specified protocol and starts to be sent
(in protocol macro mode only).
Default: 5 s (setting range: 0.1 to 25.5 s) *3
Send delay
The time can be set from when the message is converted into another protocol using Serial Gateway conversion until the data is
actually sent. (Serial Gateway or protocol macro mode)
Default: 0 s (setting range: 0.01 to 300.00 s)
Item Description
CJ1W-SCU
7
No-protocol Specifications
*1. The baud rate and the communications distance sometimes depend on the remote device.
*2. The CJ1W-SCU@2 is required for communications at 115,200 or 230,400 bps.
*3. The DTXDU (262) and DRXDU (261) instructions can be used only when a CJ1W-SCU@2 Serial Communications Unit is connected to the
CJ2H CPU Units with unit version 1.1 or later and CJ2M CPU Units.
*4. A Serial Communications Unit with unit version 2.1 or later, a CPU Unit with unit version 1.03 or later, and Sysmac Studio version 1.04 or higher
are required to use the SerialRcvNoClear instruction.
Modbus-RTU Specifications
*1. Modbus-ASCII mode is not supported.
*2. The CJ1W-SCU@2 is required for communications at 230,400 bps.
Item Description
Communications mode Full-duplex
Baud rate *1RS-232C port and RS-422A/485 ports: 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps *2
Default setting: 9,600 bps
Communications distance
*1
RS-232C port : 15 m max.
RS-422A/485 port :
• CJ1W-SCU@1-V1
500 m max. (total cable length: 500 m max., T-branch branch lines: 10 m max.)
• CJ1W-SCU@2
1,200 m max. (total cable length: 1,200 m max., Multidrop connections are possible. However, maximum cable length is 500 m if
the NT-AL001 is used for RS-422A-485 connections.)
Messages
(communications frame
structure)
Set either of the following types in the Setup Area in the allocation DM Area.
1. Data only (without start code and end code)
2. Start code + data
3. Data + end code
4. Start code + data + end code
5. Data + CR + LF
6. Start code + data +CR + LF
Set in allocated DM Area
(The start code can be included by setting it to between 00 and FF hex, and the end code can be included by setting it to between
00 and FF hex. To exclude the end code, set the number of receive data bytes.)
Start code None or 00 to FF hex
End code None, 00 to FF hex, or CR + LF
Number of receive data bytes
during reception
Set the number of receive data bytes between 1 and 256 bytes (according to the DM Area settings)
when frame structure 1 or 2 above is used.
Sending messages CJ: TXDU(256) instruction *3
NJ: SerialSend instruction
Receiving messages CJ: RXDU(255) instruction *3
NJ: SerialRcv or SerialRcvNoClear instruction *4
Maximum message length Sending and receiving: Up to 259 bytes including the start code and end code (up to 256 bytes excluding start/end codes)
Data conversion No conversion
Communications protocol None
Message delay time
CJ: When the TXD (236), TXDU (256) instruction is executed, after the send delay time, the data is sent from the port. *3
0 to 300 s (0 to 300,000 ms)
(Can be set in 10-ms units depending on the DM Area settings)
NJ: When the SerialSend instruction is executed, after the send delay time, the data is sent from the port.
0 to 300 s (0 to 300,000 ms)
(Can be set in 10-ms units: Set in System Studio or by using a device variable for CJ-series Unit.)
Receive counter The number of data bytes (0 to 256) received at the port can be counted.
Reception buffer clear
timing
• CJ1W-SCU@1-V1
The reception buffer is cleared immediately after executing the RXD(235)/RXDU(255) instruction
• CJ1W-SCU@2
With the DRXDU(261) instruction, you can specify whether the reception buffers will be cleared or not in a setting in the DM Area
words allocated to the Unit. *3
• NJ: SerialRcv instruction: After reading the receive data
SerialRcvNoClear instruction: When the receive data size variable (Size) is set to 0 *4
Item Description
Mode Modbus-RTU slave mode *1
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps *2
Default: 19,200 bps
Data length 8 bits
Parity Odd, even, or none
Default: Even
Stop bits Odd or even parity :1 bit
No parity : 2 bits
Address setting range 1 to 247 (broadcasting: 0)
Frame format
Slave address : 1 byte
Function code : 1 byte
Data : 0 to 252 bytes
CRC code : 2 bytes
8
CJ1W-SCU
Supported Commands
Unit Version and Manufacturing Dates/Lot Numbers
CJ1W-SCU@1-V1
* Available April, 2006
CJ1W-SCU@2
* A Serial Communications Unit with unit version 2.1 or later, a CPU Unit with unit version 1.03 or later, and Sysmac Studio version 1.04 or higher
are required to use the SerialRcvNoClear instruction.
Function code
(hexadecimal) Function Modbus name
01 Reads multiple bits from the CIO, Work, Holding, or Auxiliary Area of I/O memory. Read Coils
02 Reads multiple bits from the CIO Area of I/O memory. Read Discrete Inputs
03 Reads multiple words from the DM or EM Area of I/O memory. Read Holding Registers
04 Reads multiple words from the CIO, Work, Holding, or Auxiliary Area of I/O memory. Read Input Registers
05 Writes a bit in I/O memory. Write Single Coil
06 Writes a word in the DM or EM Area of I/O memory. Write Single Register
08 Executes an echoback test. Diagnostic
0F Writes multiple bits in I/O memory. Write Multiple Coils
10 Writes multiple words in the DM or EM Area of I/O memory. Write Multiple Registers
Classification Type Model May 2004 June 2004 November 2005
CPU Bus Units Serial Communications
Units
CJ1W-SCU21-V1 Per-Ver 1.2 Unit version 1.2
(Lot No:040617 and later) Unit version 1.3
CJ1W-SCU41-V1
CJ1W-SCU31-V1 — — Unit version 1.3 *
Support
Software
CX-Programmer — Ver.4.0 or earlier Ver.5.0 Ver.6.1
CX-Protocol — Ver.1.4 or earlier Ver.1.5 Ver.1.7
Classification Type Model September 2009 September 2012
CPU Bus Units Serial Communications
Units
CJ1W-SCU22
Unit version 2.0 Unit version 2.1 *1CJ1W-SCU32
CJ1W-SCU42
Support
Software
CX-Programmer — Ver.8.3 or higher
CX-Protocol — Ver.1.9 or higher
SysmacStudio 形SYSMAC-SE□ Ver.1.04 or higher
Machine
Automation
Controller
CPU Unit 形NJ5-□□□□ Ver.1.00 or earlier *
形NJ3-□□□□ Ver.1.01 or earlier *
CJ1W-SCU
9
Function Support by Unit Version
Function Support by Unit Version 2.1
Function Support by Unit Version 2.0
Function Support by Unit Version 1.2 and Unit Version 1.3
Note: Make sure that a CJ-series CPU Unit with unit version 3.0 or later is used when using no-protocol mode.
Unit version Unit version 2.1
CJ Series Serial Communications Units model
CJ1W-SCU22
CJ1W-SCU32
CJ1W-SCU42
Functions
No-
protocol NJ: SerialRcvNoClear instruction Supported
Product Unit version 2.0
CJ Series Serial Communications Units
CJ1W-SCU22
CJ1W-SCU32
CJ1W-SCU42
Functions
Serial gateway Supported
Host Link
1:1 links Supported
Host Link compatible device
selection Supported
No-protocol Supported
Protocol
macro
Link word specification data
exchange timing
On-request I/O refreshing
Continuous I/O refreshing
Reception buffer processing for
PMCR(260) instruction execution Select to clear or hold contents.
Baud rate (bps) 230,400 supported.
Standard system protocol additions Supported
MODBUS slave protocol added Supported
Product Earlier version
(pre-ver. 1.2) Unit version 1.2 Unit version 1.3
CJ Series Serial Communications Units
CJ1W-SCU21 CJ1W-SCU21-V1 CJ1W-SCU21-V1
— — CJ1W-SCU31-V1
CJ1W-SCU41 CJ1W-SCU41-V1 CJ1W-SCU41-V1
Functions
Serial gateway Not supported Supported Supported
Host Link
1:1 links Not supported Supported Supported
Host Link compatible device
selection Not supported Supported Supported
No-protocol Not supported Supported Supported
Protocol
macro
Link word specification data
exchange timing On-request I/O refreshing only On-request I/O refreshing
Continuous I/O refreshing
On-request I/O refreshing
Continuous I/O refreshing
Reception buffer processing for
PMCR(260) instruction execution Clearing only Select to clear or hold contents. Select to clear or hold contents.
Baud rate (bps)
38,400 max.
(57,600 and 115,200 not
supported)
57,600 supported. 57,600 supported.
Standard system protocol additions Not supported Supported Supported
MODBUS slave protocol added — — Supported
10
CJ1W-SCU
External Interface
Serial Communications Units provide two communications ports for external interface: RS-232C and/or RS-422A/485 ports.
2
ON
4
TERM
ERC
RUN
RD2
SCU41-V1RD1 TER1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
(RS422
/485)
OFF
WIRE
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
CJ1W-SCU41-V1
Port 1:
RS-422A/485
Unit number
switch
Terminating
resistance switch
2-wire/4-wire
switch
Port 2:
RS-232C
Indicators
ERC
RUN
RD2
SCU21-V1RD1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
CJ1W-SCU21-V1/SCU22
Port 1:
RS-232C
Unit number
switch
Port 2:
RS-232C
Indicators
Terminating
resistance switch
(for port 2)
2-wire/4-wire switch
(for port 2)
2
ON
4
TERM
ERC
RUN
RD2 TER2
SCU31-V1RD1 TER1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
(RS422
/485)
(RS422
/485)
OFF
WIRE
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Port 1:
RS-422A/485
Unit number
switch
Terminating
resistance switch
(for port 1)
2-wire/4-wire
switch (for port 1)
Port 2:
RS-422A/485
Indicators
CJ1W-SCU31-V1
2
ON
4
TERM
OFF
WIRE
2
ON
4
TERM
ERC
RUN
RD2 TER2
SCU32 RD1 TER1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
(RS422
/485)
(RS422
/485)
OFF
WIRE
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
Port1:
RS-422A/485
terminal-block
Connector
Unit number
switch
Terminating
resistance switch
(for port 1)
2-wire/4-wire
switch (for port 1)
Port2:
RS-422A/485
terminal-block
Connector
Indicators
CJ1W-SCU32
2
ON
4
TERM
OFF
WIRE
RDA-
RDA+
SDA-
SDA+
FG
RDA-
RDA+
SDA-
SDA+
FG
PORT1
(RS422
/485)
2
ON
4
TERM
ERC
RUN
RD2
SCU42 RD1 TER1
SD2
RDY
NO.
UNIT
ERH
SD1
RDA-
RDA+
SDA-
SDA+
FG
OFF
WIRE
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
CJ1W-SCU42
Port1:
RS-422A/485
terminal-block
Connector
Unit number
switch
Terminating
resistance switch
2-wire/4-wire
switch
Port 2:
RS-232C
Indicators
Magnified view of bottom-right
corner<CJ1W-SCU3 (-V1) only>
CJ1W-SCU
11
Specifications of the RS-232C port and RS-422A/485 port
RS-232C Port
*1. The CJ1W-SCU@2 is required for communications at 230,400 bps.
*2. High-speed NT link is only available with Serial Communications Units manufactured on or after December 20th, 1999. With earlier models,
only standard NT link is available.
*3. The maximum cable length for RS-232C is 15 m. The RS-232C standard, however, does not cover baud rates above 19.2 Kbps. Refer to the
manual for the device being connected to confirm support.
Connector Pin Layout
*1. Pin No. 1 and the shell are connected to the ground terminal (GR) of the Power Supply Unit inside of the Serial Communications Unit.
Therefore, the cable shield can be grounded by grounding the GR of the Power Supply Unit.
*2. The status of the RTS (RS), CTS (CS), DSR (DR), and DTR (ER) signals can be monitored in the words allocated in the CIO Area. For details,
refer to 2-3 I/O Memory Allocations.
*3. Pin 6 (5 V) is required when the NT-AL001 Link Adapter is connected.
*4. The DSR signal is used to monitor the signal cable. It can also be used as a CD (carrier detect) signal. (The DSR signal does not affect system
operation, and is available for use by the user.)
Note: Do not connect the 5-V power supply of Pin 6 to any external device other than an NT-AL001 Link Adapter. Otherwise, the external device
and the Serial Communications Unit may be damaged.
The following cables are provided for connection to NT-AL001 Link Adapters. We recommend that these cables be used.
NT-AL001 connecting cables: XW2Z-070T-1 (0.7 m)
XW2Z-200T-1 (2 m)
Applicable Connectors
Plug : XM3A-0921 (manufactured by OMRON) or equivalent
Hood : XM2S-0911-E (manufactured by OMRON) or equivalent
One plug and one hood are provided for each port.
Recommended Cables
UL2426 AWG28 × 5P IFS-RVV-SB (UL-approved, Fujikura Ltd.)
AWG28 × 5P IFVV-SB (not UL-approved, Fujikura Ltd.)
UL2426-SB (MA) 5P × 28AWG (7/0.127) (UL-approved, Hitachi Metals, Ltd.)
CO-MA-VV-SB 5P × 28AWG (7/0.127) (not UL-approved, Hitachi Metals, Ltd.)
Cable length: 15 m max.
Protocol Host Link Protocol macro 1:N NT Links
Communications
method Full-duplex Full-duplex or half-duplex Half-duplex
Synchronization Start-stop synchronization (asynchronous)
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps *1 Standard NT link or high-speed NT link *2
Connections 1:1 (1:N is possible using Link Adapters)
Transmission distance 15 m max. *3
Interface Complies with EIA RS-232C
Protocol No-protocol Serial Gateway Modbus-RTU
Communications
method Full-duplex — —
Synchronization ———
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/ 230,400 bps *1
Connections 1:1 (1:N is possible using Link Adapters)
Transmission
distance 15 m max. *3
Interface Complies with EIA RS-232C
Pin No. Abbreviation Signal name I/O
1 *1 FG Shield —
2 SD Send data Output
3 RD Receive data Input
4 *2 RTS (RS) Request to send Output
5 *2 CTS (CS) Clear to send Input
6 *3 5V Power supply —
7 *2 DSR (DR) Data set ready *4 Input
8 *2 DTR (ER) Data terminal ready Output
9 SG Signal ground —
Shell *1 FG Shield —
95
61
12
CJ1W-SCU
RS-422A/485 Port
*1. The CJ1W-SCU@2 is required for communications at 230,400 bps.
*2. High-speed NT link is only available with Serial Communications Units manufactured on or after December 20th, 1999. With earlier models,
only standard NT link is available.
Connector Pin Layout (CJ1W-SCU31-V1/SCU41-V1)
*1. When 2-wire connections are used, use Pins 1 and 2, or Pins 6 and 8.
*2. The shell is connected to the ground terminal (GR) of the Power Supply Unit inside of the Serial Communications Unit. Therefore, the cable
shield can be grounded by grounding the GR of the Power Supply Unit.
Note: With SDA/B or RDA/B, the signal polarity may be reversed by the remote device. Be sure to check the polarity before wiring.
Applicable Connectors
Plug : XM3A-0921 (OMRON) or equivalent
Hood : XM2S-0911-E (OMRON) or equivalent
One plug and one hood are provided for each port.
Recommended Cables
CO-HC-ESV-3P × 7/0.2 (manufactured by Hirakawa Hewtech Corp.)
Cable length: 500 m max. (The total combined cable length is 500 m max. Tbranch lines must be a maximum of 10 m long.)
Protocol Host Link Protocol macro 1:N NT Links
Communications
method Full-duplex Full-duplex or half-duplex Half-duplex
Synchronization Start-stop synchronous (asynchronous)
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/230,400 bps *1 Standard NT link or high-speed NT link *2
Connections 1:N (N: 32 Units max.) 1:N (N: 8 Units max.)
Transmission distance 500 m max. (The total combined cable length is 500 m max. Tbranch lines must be a maximum of 10 m long.)
Interface Complies with EIA RS-485
Protocol No-protocol Serial Gateway Modbus-RTU
Communications
method Full-duplex — —
Synchronization ———
Baud rate 1,200/2,400/4,800/9,600/19,200/38,400/57,600/115,200/ 230,400 bps *1
Connections 1:N (N: 32 Units max.)
Transmission distance 500 m max. (The total combined cable length is 500 m max. Tbranch lines must be a maximum of 10 m long.)
Interface Complies with EIA RS-485
Pin No. Abbreviation Signal name I/O
1 *1 SDA Send data - Output
2 *1 SDB Send data + Output
3 NC Not used —
4 NC Not used —
5 NC Not used —
6 *1 RDA Receive data - Input
7 NC Not used —
8 *1 RDB Receive data + Input
9 NC Not used —
Shell *2 FG Shield —
95
61
CJ1W-SCU
13
Connector Pin Layout (CJ1W-SCU32/SCU42)
*1. For 2-wire connections, use either pins 1 and 2 or pins 3 and 4.
*2. Pin 5 (the shield) is connected to the GR terminal on the Power Supply Unit though the Serial Communications Unit. The cable shield can thus
be grounded by grounding the GR terminal of the Power Supply Unit.
Note: The signal names SDA/B and RDA/B do not always have the same polarity as that shown above. Check the polarity of the external device
before making connections.
Applicable Connectors
Plug: FMC 1.5/5-STF-3.5AU (by Phoenix Contact)
Recommended Cable
CO-HC-ESV-3P×7/0.2 (by Hirakawa Hewtech)
Cable length: 1,200 m max. (multidrop connections)
Pin No. Abbreviation Signal name I/O
1 *1 RDA Receive data- Input
2 *1 RDB Receive data+ Input
3 *1 SDA Send data- Output
4 *1 SDB Send data+ Output
5 *2 FG Shield —
14
CJ1W-SCU
Dimensions (Unit: mm)
CJ1W-SCU22
CJ1W-SCU21-V1/SCU31-V1/SCU41-V1
Note: The appearance varies with the model.
CJ1W-SCU32
CJ1W-SCU42
ERC
RUN
RD2
SCU21-V1
RD1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
31 65
09
65
81.9
31
09
2
ON
4
TERM
ERC
RUN
RD2 TER2
SCU32
RD1 TER1
SD2
RDY
NO.
UNIT
ERH
SD1
PORT1
(RS422
/485)
(RS422
/485)
OFF
WIRE
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
2
ON
4
TERM
OFF
WIRE
RDA-
RDA+
SDA-
SDA+
FG
RDA-
RDA+
SDA-
SDA+
FG
65
81.9
31
09
PORT1
(RS422
/485)
2
ON
4
TERM
ERC
RUN
RD2
SCU42
RD1 TER1
SD2
RDY
NO.
UNIT
ERH
SD1
RDA-
RDB+
SDA-
SDB+
FG
OFF
WIRE
PORT2
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
CJ1W-SCU
15
Related Manuals
Manual name Cat. No. Model numbers Application Description
CJ-series Serial
Communications Units Operation
Manual for NJ-series CPU Unit
W494 CJ1W-SCU@2
Learning about the functions to use Serial
Communications Unit and Boards with NJ
series configuration (hardware and serial
communications mode).
Learning about the standard system protocol
with OMRON components
Describes the use of Serial Communications
Unit and Boards with NJ-series configuration
(hardware and serial communications mode),
including the usage of standard system
protocols.
Refer to the CX-Protocol Operation Manual
(Cat. No. W344) for the details of functions of
protocol macros made by users.
Serial Communications Boards
and Serial Communications
Units Operation Manual
W336
CS1W-SCB@1-V1
CS1W-SCU@1-V1
CJ1W-SCU@1-V1
CJ1W-SCU@2
Learning about the functions to use Serial
Communications Unit and Boards (hardware
and serial communications mode) .
Learning about the standard system protocol
with OMRON components
Describes the use of Serial Communications
Unit and Boards with CJ-series configuration
(hardware and serial communications mode),
including the usage of standard system
protocols.
Refer to the CX-Protocol Operation Manual
(Cat. No. W344) for the details of functions of
protocol macros made by users.
CX-Protocol Operation Manual W344 ---
Learning about the use of CX-Protocol, which
enables protocol macro creation.
Learning about the details of functions of
protocol macros made by users.
Describes 1) the use of the CX-Protocol, and
2) details on protocol macros.
Use this manual to create protocol macros for
serial communications, or to customize the
standard system protocol.
CX-Integrator CS/CJ/CP/NSJ-
series Network Configuration
Tool Operation Manual
W464
Learning how to configure networks (data
links, routing tables, Communications Unit
settings, etc.).
Describes operating procedures for the CX-
Integrator.
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you
have any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing by Omron). Omron
disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS. BUYER
ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the
Products or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at
Omron’s election, to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount
equal to the purchase price of the non-complying Product; provided that in no event shall Omron be responsible for warranty,
repair, indemnity or any other claims or expenses regarding the Products unless Omron’s analysis confirms that the Products
were properly handled, stored, installed and maintained and not subject to contamination, abuse, misuse or inappropriate
modification. Return of any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies shall
not be liable for the suitability or unsuitability or the results from the use of Products in combination with any electrical or
electronic components, circuits, system assemblies or any other materials or substances or environments. Any advice,
recommendations or information given orally or in writing, are not to be construed as an amendment or addition to the above
warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself
is not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine,
system, or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product
with respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence
thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate
it to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our
practice to change part numbers when published ratings or features are changed, or when significant construction changes are
made. However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers
may be assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at
any time to confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
2014.7
In the interest of product improvement, specifications are subject to change without notice.
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/
(c)Copyright OMRON Corporation 2014 All Right Reserved.
