94 - Connecting Serial Devices DeviceMaster Installation and Configuration Guide: 2000594 Rev. F
Connecting Serial Devices
Four Screw Terminals (DM-2202)
This subsection discusses the following topics for the DM-2202 with 4 serial screw terminals. See Eight Screw
Terminals (DM-2402) on Page 97 if the DeviceMaster has eight serial terminals.
• Serial Terminal (4) Connectors on Page 94
• Serial Terminal (4) Null-Modem Cables (RS-232) on Page 95
• Serial Terminal (4) Null-Modem Cables (RS-422) on Page 95
• Serial Terminal (4) Straight-Through Cables (RS-232/485) on Page 96
• Serial Terminal (4) Loopback Signals on Page 96
• Connecting Serial Devices on Page 96
Serial Terminal (4) Connectors
Use the following table or drawings for signal information. The signals for SERIAL2 are the same as
SERIAL1.
RS-232† TxD RTS RxD CTS
RS-422/RS-485
Full-Duplex
TxD- TxD+ RxD- RxD+
RS-485
Half-Duplex
TRxD- TRxD+
† RS-232 ground must be connected to the signal ground terminal.
CTSRxDRTSTxD
RS-232
RxD+
RxD-
TxD+
TxD-
RS-422
RS-485 Full-Duplex
TRxD+
TRxD-
RS-485 Half-Duplex
† Ground must be connected to the appropriate signal ground terminal.
† Wire gauge: AWG 12-22
Signal
Ground
Not connected
Positive†
Return†
6-30VDC
Signal
Ground†
Chassis
Ground†
RS-232: Connecting the Ground
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