pH ARC SensorsModbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 21/ 67
2.5.2.3 Reading the measurementvalue of PMC1
Register 2090is also used to read the measurement values of PMC1.
Start
reg. Num-
ber of
reg.
Reg1 /
Reg2 Reg3/
Reg4 Reg5/
Reg6 Reg7/
Reg8 Reg9/
Reg10 Modbus
function
code
Read
access Write
access
2090 10 Selected
physical
unit
Measure
-ment
value of
PMC1 (1)
Measure
-ment
status(2)
Min
allowed
value (1)
Max
allowed
value (1)
3, 4 U/A/S none
Figure 2.5.2.3.1:Definition of register 2090. Measurement value of PMC1.
(1) Value is alwaysin the physical unit defined in register 2090.
(2) Definitionof the status see chapter 2.5.4. All bits set to zero means: no problem.
Command: PMC1read Modbusaddress: 2090 Length: 10 Type: 3Read
Parameter: Unit Value Status Min limit Max limit
Format: Hex Float Hex Float Float
Value: 0x1000 4.02503 0x00 0 14
Figure 2.5.2.3.2:Example to read register 2090. Physical unit is set to pH (0x1000), PMC1 is pH
4.02503, Status is 0x00, Min allowedv alueis pH 0, Maxallowed value is pH 14.
Command: PMC1read Modbusaddress: 2090 Length: 10 Type: 3Read
Parameter: Unit Value Status Min limit Max limit
Format: Hex Float Hex Float Float
Value: 0x200000 175.9922 0x00 0 954.6541
Figure 2.5.2.3.3: Examplet o read register 2090. Physical unit is set to mV (0x200000), PMC1 is
175.9922m V, Status is 0x00, Min allowed value is -414.0028 mV, Max allowed value is
414.0028m V.
For the definitionof the measurement status see chapter 2.5.4.
Attention:
You cannot readselectively the registers 3 and 4 for the measurement value only. You have toread the
entire length oft hecommand (10 registers) and extract the desired information.