pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)

2.5.5.2Reading the measurement value of SMC

The registers defined here are used to read the measurement values of each SMC.

Start reg.

Num-

Reg1 / Reg2

Reg3 / Reg4

Reg5 / Reg6

Modbus

Read

Write

 

ber of

 

 

 

function

access

access

 

reg.

 

 

 

code

 

 

Address

6

Physical unit

Measurement

Standard

3, 4

U/A/S

none

 

 

 

value of SMC

deviation

 

 

 

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

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Hamilton Electronics EPHUM011 manual Reading the measurement value of SMC, 0x8000 247.56