DeviceMaster Installation and Configuration Guide: 2000594 Rev. F Connecting Serial Devices - 99
Connecting Serial Devices
Screw Terminal (8) Straight-Through Cables (RS-232/485)
RS-232 or RS-485 straight-through cables are used to connect modems and other DCE devices.
Screw Terminal (8) Loopback Signals
Use the drawing below to wire a loopback, which is used in conjunction with application software (Test
Terminal or minicom) to test serial ports.
Wire the terminals together to create a loopback.
• TxD to RxD
• RTS to CTS to RI
• DTR to CD to DSR
Note: You can use Test Terminal (Windows) or minicom
(Linux) to test the serial port. You can refer to
Testing
Ports Using Test Terminal on Page 154 for Windows
systems.
Connecting Serial Devices
Use the following information to connect the DeviceMaster with 8 serial screw terminals.
1. Connect your serial devices to the appropriate serial port on the DeviceMaster using the appropriate
cable.
Note: Refer to the hardware manufacturer’s installation documentation if you need help with connector pin
outs or cabling for the serial device.
2. You can refer to Network and Device LEDs on Page 167 for information about the LEDs.
RS-232/485 Straight-Through Cable
CD DSR RI DTR RTSTxD RxD CTS
DCD DSR RI DTR RTSTxD RxD CTS
169 72 8
62220 4235
DB9
DB25
3
4
8
or
TRxD-
or
TRxD+
TxD RxDRTS CTSCD DSR RI DTR
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