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pH ARC Sensors Modbus RTU Programmer’s Manual (EPHUM011)
624300/01 page 65 / 67
Command: Serial number
Modbus address: 1312 Length: 8 Type: 3
Read
Parameter: Text
Format: Character
Value:
0001001
Figure 2.9.2.2: Example to read register 1312.
2.9.3 Free User Memory Space
These registers can be used to store any customer specific information in the sensor. There are
different registers which can be read by everybody, but only specific operators can write them.
Start
register
Number
of
registers
Reg1 … Reg8
(16 ASCII characters)
Example of content Modbus
function
code
Read
access
Write
access
1536 8 Free user space U/A/S *FREE_USERSPACE* 3, 4, 16 U/A/S U/A/S
1544 8 Free user space U/A/S *FREE_USERSPACE* 3, 4, 16 U/A/S U/A/S
1552 8 Free user space U/A/S *FREE_USERSPACE* 3, 4, 16 U/A/S U/A/S
1560 8 Free user space U/A/S *FREE_USERSPACE* 3, 4, 16 U/A/S U/A/S
1568 8 Free user space A/S *FREE_USERSPACE* 3, 4, 16 U/A/S A/S
1576 8 Free user space A/S *FREE_USERSPACE* 3, 4, 16 U/A/S A/S
1584 8 Free user space A/S *FREE_USERSPACE* 3, 4, 16 U/A/S A/S
1592 8 Free user space A/S *FREE_USERSPACE* 3, 4, 16 U/A/S A/S
1600 8 Measuring point 242111-0001001 3, 4, 16 U/A/S S
1608 8 Free user space S *FREE_USERSPACE* 3, 4, 16 U/A/S S
1616 8 Free user space S *FREE_USERSPACE* 3, 4, 16 U/A/S S
1624 8 Free user space S *FREE_USERSPACE* 3, 4, 16 U/A/S S
1632 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1640 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1648 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1656 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1664 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1672 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1680 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1688 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1696 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1704 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1712 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1720 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1728 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1736 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1744 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
1752 8 Free user space others *FREE_USERSPACE* 3, 4 U/A/S none
Figure 2.9.3.1: Definition of registers containing user information.
An important register is 1600, as it is the description of the measuring point. The information of
this register is displayed on the ARC View Handheld in order to identify individual sensors.
Attention:
The Free User Memory Space is located in a memory which allows in total max 10’000 write
operations.