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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 25 / 67
2.5.5.2 Reading the measurement value of SMC
The registers defined here are used to read the measurement values of each SMC.
Start reg. Num-
ber of
reg.
Reg1 / Reg2 Reg3 / Reg4 Reg5 / Reg6 Modbus
function
code
Read
access
Write
access
Address 6 Physical unit Measurement
value of SMC
Standard
deviation
3, 4 U/A/S none
Figure 2.5.5.2.1: Definition of register at Address. Measurement value of each SMC.
Description Address Text Unit Min value Max value
SMC1 2472 R glass MOhm 30 600
SMC2 2504 R reference kOhm 0.25 100
SMC3 2536 R auxiliary kOhm 0.25 100
SMC4 2568 E pH vs. ref mV -900 900
SMC5 2600 E SG vs. ref mV -900 900
SMC6 2632 E aux vs. ref mV -50 50
SMC7 2664 E reference mV -900 900
SMC8 2696 pH act pH -0.5 14
SMC9 2728 T act K 253 403
Figure 2.5.5.2.2: Full list of register addresses for the measurement values of SMC1 to SMC9
Example:
Command: SMC1 read
Modbus address: 2472 Length: 6 Type: 3
Read
Parameter: Unit Value Standard dev.
Format: Hex Float Float
Value:
0x8000 247.56 0.02
Figure 2.5.5.2.3: Example to read register 2472. Physical unit is MOhm (0x8000), the measurement
value of SMC1 is 247.66 MOhm, standard deviation of SMC1 is 0.02 MOhm