RIO Remote I/O System User Guide
RTA connector pinouts
Page 204
Chapter 3 RIO Cabling information
RS422 DB25 female RTA connector pinout
Note
The pinout for cables connected to the RTA8/RS422 variant depends on
the device being connected to. For further details refer to the
documentation supplied with the product to be connected to.
Pin Signal Direction Description
1CHASSIS Chassis
2RXD+ In Receive Data
3TXD+ Out Transm it Data
4RTS+ In Receive Hardware Flow Control
5CTS+ Out Transmit Hardware Flow
Control
6DCD+ In Data Carrier Detect
7GROUND Connects to logic 0V
8DTR+ Out Data Terminal Ready
10 DTR- Out Inverse DTR
13 CTS- Out Inverse CTS
14 RXD- In Inverse RXD
16 TXD- Out Inverse TXD
18 DCD- In Inverse DCD
19 RTS- In Inverse RTS
20 DSR+ In Data Set Ready
21 RI- In Inverse Ring Indicator
22 RI+ In Ring Indicator
23 DSR- In Inverse DSR
Pin 1 (looking into connector)