RIO Remote I/O System User Guide
RTA connector pinouts
Page 203
Chapter 3 RIO Cabling information
DB25 female RTA connector pinout
Pin Signal Direction Description
1Chassis Chassis ground
2TXD In Transmit Data
3RXD Out Receive Data
4RTS In Request To Send
5CTS Out Clear To Send
6DSR Out Data Set Ready
7GND Ground
8DCD In Data Carrier Detect
20 DTR In Data Terminal Ready
22 RI In Ring Indicator
Pin 1 (looking into connector)