
MODCELL Multiloop Processor
COMMUNICATIONS CONNECTIONS
Figure 4-6. Typical Modbus Connections for 2034N RS-485, 4-Wire Module used as a Slave
Isolated +5Vdc
+5Vdc
Personal Computer
Modbus Master
TX-
TX+
S32
BASE INSTRUMENT
LOWER
TERMINAL
HOUSING
2034N RS-485 MODULE
(Module Locations 31 & 32)
1
22
1
560 Ohm
120 Ohm
Other Slaves
Modbus Slave
TX-
TX+
120 Ohm
Last Slave
560 Ohm
Note: All resistors are 0.25W
RS485 Interface
RX-
RX+
S31
13
142
1
560 Ohm
TERM
Switch
NO
560 Ohm
120 Ohm
RX-
RX+
120 Ohm
560 Ohm
Isolated
Common
57
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