Control Microsystems SCADAPack 32P - Two Wire Mode

+T
X
–
T
X
–
R
X
+R
X
+T
X
–
T
X
–
R
X
+R
X
+T
X
–
T
X
–
R
X
+R
X
+T
X
–
T
X
–
R
X
+R
X
M A ST ER
SLAVE
SLAVE
SLAVE
Last station in network
may require terminations.
First station in network
may require termination.
RS-485 network
4000 feet (1200 m)
maximum length
4.5.2 Two wire mode
Two wire operation uses one pair of wires for transmitting and receiving data. +Tx must be
connected to +Rx and –Tx must be connected to the –Rx. This pair of wires becomes the
transmitting and receiving pair. The following diagram shows the wiring details for a two wire
connection.
SCADAPack 32P Controller Hardware Manual
May 26, 2006
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