RIO Remote I/O System User Guide
Installing a Long Distance Module (LDM)
Page 185
Chapter 2 Installing hardware and software
DB25 female on flying lead
Pin Signal Name Direction
1Chassis Chassis Ground —
2TXD Transmit Data O utput RS232
3RXD Receive Data Input RS232
4RTS* Request To Send Output RS232
5CTS* Clear To send Input RS232
6N/C Not Connected —
7GND Ground —
8DCD* Data Carrier Detect Input RS232
9DCD+ Data Carrier Detect Input RS422
10 RXD- Inverse RXD Input RS422
11 RXD+ Receive Data Input RS422
12 TXD- Inverse TXD Output RS422
13 TXD+ Transmit Data O utput RS422
14 CTS- Inverse CTS Input RS422
15 TXC Transmit Clock Input RS232
16 CTS+ Clear To Send Input RS422
17 RXC Receive Clock Input RS232
18 RTS- Inverse RTS Output RS422
19 RTS+ Request To Send Output RS422
20 DTR* Data Terminal ready Output RS232
21 DCD- Inverse DCD Input RS422
22 DTR+ Data Terminal Ready Output RS422
23 DTR- Inverse DTR Output RS422
24 RXC- Inverse RXC Input RS422
25 RXC+ Receive Clock Input RS422