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4.6 ModBus RTU protocol
The list of commands for data transmission using the RS485 RTU Serial Port is found below
> Read Holding Register
> Write Multiple Register
> Report Slave ID
In response to the “Report Slave ID” command, the system returns the following string:
"Device"+ Firmware code + Edition
ModBus profile table Address
Description
Property
Range
Operating state
1000
pH Measure
Read 0 to 1400
Full Operating
1001
Cl Measure
Read 0 to 500
Full Operating
1002
Orp Measure
Read -2000 to +2000
Full Operating
1003
Temperature Measure
Read 0 to 1050
Full Operating
1004
Frequency Measure
Read 5 to 15000
Readable but not active
1005
Conductivity Measure
Read 0 to 10000
Readable but not active
1006
Pot1 Measure
Read 0 to 20000
Readable but not active
1007
Pot2 Measure
Read 0 to 20000
Readable but not active
1008
Status
Read See Note 1
Full Operating
1100
SetPoint pH
Read/Write 0 to 1400
Full Operating
1101
SetPoint Cl
Read/Write 0 to 500
Full Operating
1102
SetPoint Orp
Read/Write -2000 to +2000
Full Operating
1103
SetPoint Temperature
Read/Write 0 to 1050
Full Operating
Note1: STATUS (bit field 16 bit register)
1
LEVEL_0_ALARM
2
LEVEL_1_ALARM
3
HOLD_ALARM
4
REED_ALARM
5
Reserved
6
Reserved
7
Reserved
8
Reserved
9
Reserved
10 Reserved
11 Reserved
12 Reserved
13 STAT (Wieving statistics Mode)
14 Reserved
15 OFA (Over Feed Alarm)
16 PERMANENCY (Permanency Alarm)
Summary of Contents for Kontrol 800
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