11-7
IM CW120-E
Communication Functions
11
11.2 RS-485
● RS-485 Interface Connections
See the figure below for the wiring of RS-485 cables (in two-wire method)
to connect to a personal computer. When using the RS-232 port of the
PC, you need an RS-232/RS-485 converter.
RS-232/RS-485
converter
CW120/121 CW120/121 CW120/121
PC
RS-232
Ter minating resistor: On
Example: Yokogawa M&C ML1 converter
Ter minating resistor: On
Communication cable Communication cable
Pair
Up to 31 meters
+: SD +(send data) / RD +(receive data)
–: SD –(send data) / RD –(receive data)
TM: Terminating resistor (short-circuiting with the + terminal switches on
the terminating resistor).
SG: Signal ground
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