Indunium 2i User Guide
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2.6
Connect the Modem to External Device
User can use the serial cable to connect the modem’s DB9 female connector to external controller /
computer.
PIN assignment for modem’s DB9 female connector
2.7
Connecting the I/O Device and Sensors
Digital Input Dry Contact:
PIN Assignment
DB9 Female Connector
PIN RS232 RS485
(2-wire)
I/O
1
Data- (B)
2
RXD -> Data+ (A)
3
TXD <-
4
DO
5
GND
GND
6
DI
7
RTS <-
8
CTS ->
9
IO
GND