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Connecting Serial Devices
Nine Screw Terminals (EIP-2201)
This subsection discusses the following topics for the EIP-2201 with 9 serial screw terminals.
•
Screw Terminal Connectors (9)
•
Screw Terminal (9) Null-Modem RS-232 Cables
•
Screw Terminal (9) Null-Modem RS-422 Cables
•
Screw Terminal (9) RS-232/485 Straight-Through Cables
•
Screw Terminal (9) Loopback Signals
•
Connecting Serial Devices
Screw Terminal Connectors (9)
Use the following table or drawings for signal information.
RS-232
RI
CD
DSR
DTR
† Ground must be connected to the signal ground terminal.
RS-232
CD
RS-422/RS-485
N/A
Full-Duplex
RS-485 Half-
N/A
Duplex
† Ground must be connected to the signal ground terminal.
Screw Terminal (9) Null-Modem RS-232 Cables
An RS-232 null-modem cable is required for connecting DTE devices.
48 - Connecting Serial Devices
on Page 48
on Page 50
on Page 50
RS-485 Full-Duplex
RxD
Signal
TxD
Gnd
CTS
RTS
DSR
RI
DTR
N/A
N/A
N/A
N/A
N/A
N/A
RS-232 Null-Modem Cable
CD
DSR
RI
DCD DTR
RI
1
4
9
DB9
8
20
22
DB25
DeviceMaster EIP | UP Hardware Installation and Configuration Guide: 2000633 Rev. C
on Page 48
on Page 49
on Page 49
RS-422
RS-485 Half-Duplex
Signal
RxD-
TxD-
Gnd
TxD+
RxD+
TxD
RTS
RxD
TxD-
TxD+
RxD-
TRxD-
TRxD+ N/A
DTR
TxD
RTS
RxD CTS
DSR
RxD
CTS
TxD RTS
6
2
8
3
6
3
5
2
TRxD-
Signal
Gnd
TRxD+
CTS
Signal GND
RxD+
Signal GND
N/A
Signal GND
Sig Gnd
Gnd
7
5
4
7
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Troubleshooting
