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Hamilton Electronics EPHUM011 User Manual

Page 34

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pH ARC Sensors Modbus RTU Programmer

s Manual (EPHUM011)

624300/01

page 34 / 67

Command: Read calibration stability

Modbus address:

5128

Length:

4

Type:

3

Read

Parameter:

Max drift pH
[pH/min]

Max drift Temp
[K/min]

Format:

Float

Float

Value:

0.1

0.5

Figure 2.7.2.1.5: Example to read the calibration stability.

Command: Set calibration stability

Modbus address:

5128

Length:

4

Type:

16

Write

Parameter:

Max drift pH
[pH/min]

Max drift Temp
[K/min]

Format:

Float

Float

Value:

0.2

0.5

Figure 2.7.2.1.6: Example to set the calibration stability.

Attention:

The stability criteria defined in register 5128 is valid for CP1 and CP2 only, but NOT for CP6.

2.7.2.2

Calibration Point 6 (Product Calibration)

The limits for calibration point 6 are given in register 5312.

Start
register

Number of
registers

Reg1 / Reg2

Reg3 / Reg4

Reg5 / Reg6

Modbus
function code

Read
access

Write
access

5312

6

Physical unit
currently
active for
CP6

Min value for
CP6 (in the
physical unit
as defined in
Reg1 and 2)

Max value for
CP6 (in the
physical unit
as defined in
Reg1 and 2)

3, 4

U/A/S

none

Figure 2.7.2.2.1: Definition of register 5312 for CP6.

Command: Calibration limits CP6

Modbus address:

5312

Length:

6

Type:

3

Read

Parameter:

Unit

Min value

Max value

Format:

Hex

Float

Float

Value:

0x01000

0

14

Figure 2.7.2.2.2: Example to read the limits of CP6. The active physical unit is pH, the min value is pH

0 and the max value is pH 14.

Note: the definition of min and max is different than the one for CP1 / CP2, because CP6 can be

set to any pH value.