15
Raveon Technologies Corp.
As you can see, the MODE pin is not grounded, which is correct for simplex. If you want,
you can wire up the RS-422 Simplex to act like an RS-485 2-wire.
3.6. GPIO
[ G ]
Uses the same IO connector as the RS-485, and has serial IO and general purpose IO
functions that are software configurable. The pin-numbers on this connector are
different than the RS-485 pin-out.
Pin #
Name
Direction
Function
Level / Specification
1
RX
In
Serial data Input
RS232
2
TX
Out
Serial Data Output
RS232
3
IO0
I/O
I/O Pin 0
Configurable General Purpose IO (GPIO).
Available Modes: A, C, E
4
IO1
I/O
I/O Pin 1
Configurable General Purpose IO (GPIO)
Available Modes: A, C, D, E
5
IO2
I/O
I/O Pin 2
Configurable General Purpose IO (GPIO).
Available Modes: A, C, D, E
6
GND
-
Ground
Connect to earth ground.
The GPIO pins have a variety of IO mode options. They are configured with the
IOPIN
command. The configuration codes for the various modes are:
A
Digital Input bit.
B
Digital output bit. (Not supported in GPIO mode)
C
Open drain MOSFET output.
D
DC switched power output.
E
Analog; voltage input
An RS232 serial cable can be connected to pins 1, 2, and 6 to
configure the internal radio modem and the MIMIC mode
