Comtrol DeviceMaster LT - Manual (Page 65)

DeviceMaster LT User Guide: 2000586 Rev. B Connecting Serial Devices - 65
Connecting Serial Devices
This section discusses connecting your serial devices to the DeviceMaster LT. It
also provides you with information to build serial cables and loopback connectors
to test the serial ports.
Use the appropriate subsection to connect asynchronous serial devices to the
DeviceMaster LT ports.
This subsection provides the following information:
• Connector pin assignments (below)
• RJ45 Null-Modem Cables (RS-232) on Page 66
• RJ45 Null-Modem Cables (RS-422) on Page 66
• RJ45 Straight-Through Cables (RS-232/485) on Page 66
• RJ45 Loopback Plugs on Page 67
• RJ45 RS-485 Test Cable on Page 67
• Connecting RJ45 Devices on Page 67
You can build your own null-modem or straight-through RJ45 serial cables if you
are using the DB9 to RJ45 adapters using the following subsections.
Pin RS-232
RS-422
RS-485 (4-Wire) RS-485
(2-Wire)
1 RTS Not used Not used
2 DSR RxD- Not used
3 DCD Not used Not used
4 RxD RxD+ Not used
5 TxD TxD+ TxD/RxD+
6 GND GND GND
7 DTR TxD- TxD/RxD-
8 CTS Not used Not used