JLCooper Electronics gBOX, User Manual, Page: 16 / 23

16
GPI Port Pinouts
The GPI ports on the rear of the gBOX are 25 pin D-sub
connectors. The GPI In connector has 24 TTL/CMOS compatible
inputs with internal pull-ups to +5 volts. The GPI Out connector
has 24 TTL/CMOS compatible outputs. On both connectors, pin 1
is the ground reference and pins 2-25 are the GPI signals.
When gBOXes connected together in a client/server manner
establish a connection, both client and server gBOXes will send
the state of its GPI In ports to each other so it can be shown on the
GPI Out port on the remote gBOX. After that, changes to a GPI In
port will cause a gBOX to send a GPI message to the remote
gBOX. Additionally, the gBOXes will send a GPI message every
5 seconds to keep the connection alive and to refresh the state of
the GPI outputs.
A packet is sent whenever a change to the GPI In is sensed. At
present, it is sampled about every 20 milliseconds.
MSB LSB
Byte1 Pin 9 Pin 8 Pin 7 Pin 6 Pin 5 Pin 4 Pin 3 Pin 2
Byte2 Pin 17 Pin 16 Pin 15 Pin 14 Pin 13 Pin 12 Pin 11 Pin 10
Byte3 Pin 25 Pin 24 Pin 23 Pin 22 Pin 21 Pin 20 Pin 19 Pin 18
gBOX GPI 1-24 In/Out Pinouts
MSB LSB
Byte4 Pin 9 Pin 8 Pin 7 Pin 6 Pin 5 Pin 4 Pin 3 Pin 2
Byte5 Pin 17 Pin 16 Pin 15 Pin 14 Pin 13 Pin 12 Pin 11 Pin 10
Byte6 Pin 25 Pin 24 Pin 23 Pin 22 Pin 21 Pin 20 Pin 19 Pin 18
gBOX GPI 25-48 In/Out Pinouts
Pin 1 is ground.