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SCADA-Modbus® System Guidelines
Appendix E
Table 34 Channels’ Read Holding Register Addresses
Name Type Size (bits) # of Registers
Start Address
Hi
Start Address
Lo
Registers
Temperature Float 32 2 00 00 40001-40002
Rainfall Float 32 2 00 02 40003-40004
pH (or ORP) Float 32 2 00 04 40005-40006
Level 1 Float 32 2 00 06 40007-40008
Velocity 1 Float 32 2 00 08 40009-40010
Channel 1 Float 32 2 00 0A 40011-40012
Channel 2 Float 32 2 00 0C 40013-40014
Channel 3 Float 32 2 00 0E 40015-40016
Channel 4 (D.O.) Float 32 2 00 10 40017-40018
Channel 5 (D.O. Temp.) Float 32 2 00 12 40019-40020
Channel 6 (Conductivity) Float 32 2 00 14 40021-40022
Channel 7 (Cond. Temp.) Float 32 2 00 16 40023-40024
Flow 1 Float 32 2 00 20 40033-40034
Power Float 32 2 00 26 40039-40040
Table 35 Channels’ Units of Measure Read Holding Register Addresses*
Name Type Size (bits) # of Registers
Start Address
Hi
Start Address
Lo
Registers
Temperature Integer 16 1 00 31 40050
Rainfall Integer 16 1 00 32 40051
pH (or ORP) Integer 16 1 00 33 40052
Level 1 Integer 16 1 00 34 40053
Velocity 1 Integer 16 1 00 35 40054
Channel 1 Integer 16 1 00 36 40055
Channel 2 Integer 16 1 00 37 40056
Channel 3 Integer 16 1 00 38 40057
Channel 4 (D.O.) Integer 16 1 00 39 40058
Channel 5 (D.O. Temp.) Integer 16 1 00 3A 40059
Channel 6 (Conductivity) Integer 16 1 00 3B 40060
Channel 7 (Cond. Temp.) Integer 16 1 00 3C 40061
Flow 1 Integer 16 1 00 41 40066
* The addresses shown above return a code that represents the appropriate unit of measure.
Table 36 Flow Totalizer Read Holding Register Addresses
Name Type Size (bits) # of Registers
Start Address
Hi
Start Address
Lo
Registers
Total Flow 1 Float 32 2 00 4A 40075-40076
Total Flow Units Integer 16 1 00 50 40081
Total Flow Multiplier Float 32 2 00 51 40083-40084