Comtrol UP 16-Port - Manual (Page 25)

DeviceMaster UP 16-Port Hardware User Guide: 2000596 Rev. B Connecting Serial Devices - 25
Connecting Serial Devices
Note: If you have a DeviceMaster UP with 1, 2, or 4-ports, use the DeviceMaster
UP Hardware Installation and Configuration Guide because the RJ45
connectors have different pin outs.
This section discusses connecting your serial devices to the DeviceMaster UP. 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 UP ports.
This subsection provides the following information:
• Connector pin assignments (below)
• RJ45 Null-Modem Cables (RS-232) on Page 26
• RJ45 Null-Modem Cables (RS-422) on Page 26
• RJ45 Straight-Through Cables (RS-232/485) on Page 26
• RJ45 Loopback Plugs on Page 27
• RJ45 RS-485 Test Cable on Page 27
• Connecting RJ45 Devices on Page 27
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