User guide

IOLAN+, IOLAN+ Rack & IOLAN+ 102/104 User guide
Hardware Changes
Page 175
RS-422 Serial Port Connections
Functionally, the difference between the RS-232 and the RS-422 versions is the absence of
support for hardware flow control lines (RTS and CTS) and modem control lines (DSR and
DCD). The performance and support for 115.2k baud are unaffected by the different serial
ports.
Pin Signal Direction Description
1 Not used No connection
2 S/GND Signal ground
3 RXA - In Receive Data A
4 TXA - Out Transmit Data A
5 TXB + Out Transmit Data B
6 RXB + In Receive Data B
7 Not used No connection
8 S/GND Signal ground