Comtrol Building Custom Cables - Manual (Page 4)

4 Pinouts for DB25 Connectors
Building Custom Cables
RS-422 DTE to DTE Cables
Most RS-422 communication links usually do not use hardware
handshaking or signal ground lines. The following figure shows
twisted-pair transmission lines that work in most cases.
Pinouts for DB25 Connectors
Use the following table and figure for pinout information for all
interface boxes and DB25 connectors on the Quadcable and Octacable.
Note: The Quadcable, Octacable, and the RJ45 Rack Mount do not
support RS-422 mode.
Table 1. DB25 Connector Pinouts
Pin RS-232 Signal RS-422 Signal
1 Not used Not used
2 T x D Not used*
3 R x D Not used*
4 RTS Not used*
5 CTS Not used*
6 DSR Not used*
7 Signal ground Signal ground*
8 DCD Not used*
9 through 14 Not used Not used
15 Not used R x D +
16 Not used Not used
17 Not used R x D -
18 Not used Not used
19 Not used T x D +
RocketPort Connector
TxD+
RxD+
Name
DB25
19
15
Signal
RxD+
TxD+
Name Pins
Remote Connector
TxD- 25
RxD- 17
Signal
RxD-
TxD-
GND 7 GND