Micromod MOD: MODCELL Multiloop Processor 2002N Model C and Associated Hardware User Manual
Page 63
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
2
2
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
14
2
1
560
Ohm
TERM
Switch
NO
560
Ohm
120
Ohm
RX
-
RX+
120
Ohm
560
Ohm
Isolated
Common
5
7
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