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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 19 / 67
The pH ARC Sensor register structure uses the following physical units used for Primary or Secondary
Measurement Channels.
Bit # Hex code Physical unit Start register. (8 ASCII characters, length 4 registers,
Type 3, read for U/A/S)
0 (LSB) 0x00000001 none 1920
1 0x00000002 K 1924
2 0x00000004 °C 1928
3 0x00000008 °F 1932
4 0x00000010 %-vol 1936
5 0x00000020 %-sat 1940
6 0x00000040 ug/l ppb 1944
7 0x00000080 mg/l ppm 1948
8 0x00000100 g/l 1952
9 0x00000200 uS/cm 1956
10 0x00000400 mS/cm 1960
11 0x00000800 1/cm 1964
12 0x00001000 pH 1968
13 0x00002000 mV/pH 1972
14 0x00004000 kOhm 1976
15 0x00008000 MOhm 1980
16 0x00010000 pA 1984
17 0x00020000 nA 1988
18 0x00040000 uA 1992
19 0x00080000 mA 1996
20 0x00100000 uV 2000
21 0x00200000 mV 2004
22 0x00400000 V 2008
23 0x00800000 mbar 2012
24 0x01000000 Pa 2016
25 0x02000000 Ohm 2020
26 0x04000000 %/°C 2024
27 0x08000000 ° 2028
28 0x10000000 not used 2032
29 0x20000000 not used 2036
30 0x40000000 not used 2040
31 (MSB) 0x80000000 SPECIAL 2044
Figure 2.5.1.4: Definition of physical units used for PMC and SMC.
Command: Unit text
Modbus address: 1968 Length: 4 Type: 3
Read
Parameter: Text
Format: Character
Value:
pH
Figure 2.5.1.5: Example to read the physical unit in plain text ASCII in register 1968