Omron 3G3RX2-A2 Series Instruction Manual page 78

Control circuit
■RS485 Communication Terminal
CM1 SP
(+)
Connect CM1 to the SG
(signal ground) of an
external device.
SP and SN terminals with the same names are internally connected respectively, so they can be used
for wiring multiple terminals.
Serial
RS485 com-
communi-
munication
cation
34
Modbus communication
SN SP SN RP
(-)
When enabling the terminating
resistor, short RP-SN.
Terminal Terminal
symbol name
RS-485
SP
terminal
SN
for Modbus
RP
communi-
(CM1)
cation
Control circuit terminal area
Description
SP terminal: RS-485 differential (+) signal
SN terminal: RS-485 differential (-) signal
RP terminal: Connect to SP via tile terminating
resistor
CM1 terminal: Connect with the signal ground
of an external communication device.
(also used by FM terminal)
There are two SP terminals and SN terminals
each, which are connected internally.
Maximum baud rate is 115.2kbps.
Electrical character-
istics
Equipped with termi-
nating resistor
(120Ω)
Enable: Short RP-SN
Disable: Open RP-SN