MR-BusIO-DCINTM BusIO DC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
GRAVITECH.US
uResearch
GRAVITECH GROUP
MR-BusIO-DCINTM BusIO DC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
The MR-BusIO-DCIN is an experiment
board for receiving 5V, 12V or 24VDC
input and translates into TTL 5VDC level.
It is using PC817 Photo-coupler IC to
isolate high current and low current. It is
best for monitoring the present of DC
voltage.
The board can be use with MR-BusIO-
MAIN board or stand-alone. PCB size is
0.63” x 2.80”
The PC817 require at least 5mA to drive
input photo-coupler LED. It can take up to
6V in reverse bias. For an output
(between collector and emitter), it can
drive up to 35V with 50mA continuous
current.
The operation of this board starts when
it’s receiving input DC voltage from 2-PIN
terminal block. The current will be limited
around 9-10mA (enough to turn on
PC817). The output of photo-coupler then
pulls the I/O pin LOW then an indicator
LED is illuminated. In case of user need to
apply input voltage beyond 5V, 12V or
24V, the new current limited resistor can
be calculate by I=V/R when I=9mA.
User must set the jumper to appropriate
input voltage. This board can be use to
detect DC voltage.
The MR-BusIO-MAIN is available for
purchase via our website. If you don’t see
the item you need, please contract our
sales department at sales@gravitech.us
• MR-BusIO-MAIN
Experiment board which receives output
signals from any microcontrollers. The
signals then distribute to daughter boards
for each experiment. It designed to
connect directly with 10PIN MRconnect©.
It is a quick and easy way to control up to
8 daughter boards.
Description
MR-BusIO-MAIN
Operation:
MR-BusIO-DCINTM BusIO DC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
FIG 1: MR-BusIO-DCIN Board Layout
FIG 2: MR-BusIO-DCIN Schematic
MR-BusIO-DCINTM BusIO DC INPUT BOARD
User Manual
Copyright © 2007 MicroResearch
GRAVITECH GROUP WWW.GRAVITECH.US
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