
MODCELL Multiloop Processor
COMMUNICATIONS CONNECTIONS
Figure 4-3. Typical Modbus Connections for 2032N RS-485, 2-Wire Module used as a Slave
+5Vdc
Personal Computer
Modbus Master
RXTX-
RXTX+
S32
BASE INSTRUMENT
LOWER
TERMINAL
HOUSING
2032N RS-485 MODULE
(Module Location 32)
DATA
PLCC
SEL
CLK
GND
+5V dc
75LBC176D
3
6
4
7
5
1
2
A
B
2
1
10
12
11
Xmit Enab
XMIT
RCV
560
Ohm
120 Ohm
Other Slaves
Modbus Slave
RXTX-
RXTX+
120
Ohm
Last Slave
560
Ohm
Note: All resistors are 0.25W
RS485
Interface
Isolated
Common
Isolated
+5V dc
53
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