Digi Connect Wi ME 9210 Hardware Reference Manual page 19

Pin 1 Pin 2
— RXD
— Receive Data
RS232-Enable Pin Header, P5
P5 is used to enable or disable serial port RS232s transceiver. Shorting P5 pins 1 and 2 will enable
the RS232 transceiver. Shorting P5 pins 2 and 3 will disable the RS232 transceiver.
GPIO Port, P7
The GPIO port is a 9-pin male right-angle connector that is labeled as P7 on the development board.
See the following figure for pin orientation; see the following tables for pin assignments. For input
and output threshold specifications, see "DC Characteristics" on page 36. Note that each signal has a
220 ohm series resistor between the P7 pin and the module (except GND).
Note:
GPIO Port Pin Orientation
Pin 1
Signal GPIO-1
Secondary Serial Port Pin Assignments
Pin 3 Pin 4
TXD —
Transmit Data —
The development board is shipped with a 9-pin screw-flange plug attached to the GPIO
port.
GPIO Port Pin Assignments
Pin 2 Pin 3 Pin 4
GND GPIO-2 GND
Pin 5 Pin 6 Pin 7
GND —
Signal/
Chassis —
Ground
Pin 1 Pin 9
Pin 5 Pin 6 Pin 7
GPIO-3 TXD_TTL GPIO-4
Pin 8 Pin 9
— — —
— — —
Pin 8 Pin 9
RXD_TTL GPIO-5
      
1 9