Xylem ODO RTU User Manual page 22

Optical dissolved oxygen & temperature sensor
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ODO Cap Serial Number
The serial number of the ODO cap is available for lot tracking purposes and is available as read-only using a read holding registers
command (function code 0x03) starting at address 0x0120. The value is a nine character ASCII string with a NULL character padding
as the unused last byte returned.
Address
Description
0x0120
0x0121
0x0122
ODO Cap Serial Number [0:8] + pad
0x0123
0x0124
Request
Function Code
Register Address
Number Registers
Response
Function Code
Byte Count
Register Values
Modbus Configuration & Commands
1 byte
2 bytes
2 bytes
1 byte
1 byte
10 bytes
0x03
0x0120
0x0005
0x03
0x0A
ODO Cap Serial Number [0:8] + pad
22
R/W
Type
Default
R
ASCII
N/A

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