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Instruction Manual
IM-105-4000, Rev 1.3
October 2008
Appendix C
MODBUS
COMMUNICATIONS
Table C-1. Modbus Addresses
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ModBus Communications
The OPM 4000 is capable of Modbus communications. To communicate with
the OPM 4000 via Modbus, connect the Modbus signal wires to the Isolated
RS 485 terminals 1, 2, and 3 on the back of the Control Room Unit. These
terminals are shown in Figure 2-11. The Modbus addresses used by the OPM
4000 are shown in Table C-1.
Read Block
Address
Function
40150
0% to 100% instantaneous opacity output (analog 4-20 mA)
40151
0% to 100% average opacity output (analog 4-20 mA)
00100
Cal zero check
00101
Cal span check
00140
Cal zero fail alarm
00141
Cal span fail alarm
00042
Loss of 120 VAC transceiver power
00075
Dust/Zero shift alarm
00097
High opacity alarm
00098
Common fault
Write Block
Address
Function
45
Remote Cal Initiate
Note 1: Air purge low, No stack power, T2 4-20 mA lost/low, Maintenance mode, Window dust, Zero cal
fail, Span cal fail, and Manual cal
(Note 1)
OPM 4000
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