232LPTTLxx-0712-1/2
www.bb-elec.com orders@bb-elec.com support@bb-elec.com
International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
PRODUCT INFORMATION B&B ELECTRONICS
Models: 232LPTTL, 232LPTTL33
Four Channel RS-232 to
TTL/CMOS Converters
Description
Model 232LPTTL converts RS-232 to 5VDC TTL/CMOS compatible levels. Model 232LPTTL33 converts RS-232 to
3.3VDC TTL/CMOS compatible levels. Two channels are used to convert from RS-232 to TTL/CMOS signals and two
channels are used to convert from TTL/CMOS signals to RS-232. These converters support TD, RD, RTS, and CTS.
DB9S female connector on the RS-232 side. DB9P male connector on the TTL/CMOS side. This unit is powered from
the RS-232 data and handshake lines, whether the lines are high or low.
Pins used are:
RS-232 DB9S Female Pin Function TTL/CMOS DB9P Male Pin
3 (input) ................................. TD .............................. 3 (output)
2 (output) .............................. RD.............................. 2 (input)
7 (input) ............................... RTS............................. 7 (output)
8 (output) ............................. CTS............................. 8 (input)
5 (signal gnd)……………….GND...…………………..5 (signal gnd)
Pin 5 is signal ground for both connectors. Both models are powered by the signals on pins 7(RTS), 4(DTR), and 3(TD).
These handshake lines can be in either the high or low condition, but must be present to power the converter. The unit
can work at baud rates up to 115.2 kbps.
It is important that TTL/CMOS logic, and only TTL/CMOS logic (0 to +5 VDC for the 232LPTTL, and 0 to +3.3VDC for
the 232LPTTL33) is used for the TTL/CMOS side of the converter. The maximum sinking current for one TTL/CMOS
output is 3.2 mA. The maximum source current for one TTL/CMOS is 1 mA. Signal levels are inverted by the
converters. Please refer to table below.
Polarity
5VDC TTL/CMOS Input
3.3VDC TTL/CMOS Input
RS-232 Output
Low (< .8V)
Low (< .8V)
+5V minimum, +9V typical
High (> 2V)
High (> 2V)
-5V minimum, -+9V typical
5VDC TTL/CMOS Output
3.3VDC TTL/CMOS Output
RS-232 Input
+3.45V minimum, +4.6V typical
+2.4V minimum, +3.0V typical
Low (< .2V)
+.55V maximum, +.1V typical
+.55V maximum, +.1V typical
High (> 2.4V)
Model Number
Decription
232LPTTL
Four Channel RS-232 to 5VDC TTL/CMOS Converter
232LPTTL33
Four Channel RS-232 to 3.3VDC TTL/CMOS Converter
232LPTTLxx-0712-2/2
www.bb-elec.com orders@bb-elec.com support@bb-elec.com
International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax 433-5104
European Office: Westlink Commercial Park Oranmore Co. Galway Ireland +353 91 792444 Fax +353 91 792445
PRODUCT INFORMATION B&B ELECTRONICS
Specifications
Supply Voltage: Port-powered
Temperature Range: 0 to 70°C
Data Rates: Up to 115.2 kbps
DECLARATION OF CONFORMITY
Manufacturer’s Name: B&B Electronics Manufacturing Company
Manufacturer’s Address: P.O. Box 1040
707 Dayton Road
Ottawa, IL 61350 USA
Model Numbers: 232LPTTL, 232LPTTL33
Description: 4-Channel RS-232 to TTL/CMOS Converters s
Type: Light industrial ITE equipment
Application of Council Directive: 89/336/EEC
Standards: EN 55022
EN 61000-6-1
EN 61000 (-4-2, -4-3, -4-4, -4-5, -4-6, -4-8, -4-11)
Michael J. Fahrion, Director of Engineering
