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DeviceMaster PNIO | UP User Guide
: 2000639 Rev. A
Connecting Serial Devices - 47
Connecting Serial Devices
Eight Screw Terminals
This subsection discusses the following topics for the DeviceMaster with 8 serial
screw terminals.
•
•
Screw Terminal (8) Null-Modem Cables (RS-232)
•
Screw Terminal (8) Null-Modem Cables (RS-422)
•
Screw Terminal (8) Straight-Through Cables (RS-232/485)
•
Screw Terminal (8) Loopback Signals
•
Screw Terminal (8)
Connectors
Use the following drawings or table for signal information. The signals for
SERIAL2
are the same as
SERIAL1
.
RS-232
CD
DSR RI
DTR TxD
RTS
RxD
CTS
RS-422/RS-485
Full-Duplex
N/A N/A
N/A N/A TxD-
TxD+
RxD- RxD+
RS-485 Half-
Duplex
N/A N/A
N/A N/A TRxD-
TRxD+
N/A
N/A
† RS-232 ground must be connected to the appropriate signal ground
terminal.
RS-232†
RS-422
RS-485 Full-Duplex
RS-485 Half-Duplex
CD
DSR
RI
TxD
RTS
RxD
CTS
DTR
TxD-
TxD+
RxD-
RxD+
TRxD-
TRxD+
†
RS-232
ground
must
be
connected
to
the
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