Connecting Serial Devices - Comtrol DeviceMaster LT User Manual

DeviceMaster LT User Guide: 2000586 Rev. B

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)
• RJ45 Null-Modem Cables (RS-422)
• RJ45 Straight-Through Cables (RS-232/485)
• RJ45 Loopback Plugs
• RJ45 RS-485 Test Cable
• Connecting RJ45 Devices
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
1
2
3
4
5
6
7
8
on Page 66
on Page 66
on Page 67
on Page 67
on Page 67
RS-422
RS-232
RS-485 (4-Wire)
RTS Not used
DSR RxD-
DCD Not used
RxD RxD+
TxD TxD+
GND GND
DTR TxD-
CTS Not used
on Page 66
RS-485
(2-Wire)
Not used
Not used
Not used
Not used
TxD/RxD+
GND
TxD/RxD-
Not used
Connecting Serial Devices - 65