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Modbus settings
Modbus settings
isoNAV685-D-B_D00264_03_M_XXEN/06.2017
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17.2.3 Modbus response
The response consists of 2 bytes per register. The byte sequence is defined with the Most
Significant Bit (MSB) first.
17.2.4 Structure of exception code
Byte
Name
Example
…
…
…
Byte 7
Modbus function code
0x03
Byte 8
Byte count
0x04
Byte 9,10
Value in Register 0
0x1234 (fictitous value)
Byte 11,12
Value in Register 1
0x2345 (fictitous value)
Byte
Name
Example
…
…
…
Byte 7
Modbus function code
0x83
Byte 8
Exception code
0x01 or 0x02
17.3 Measuring value information
17.3.1 High-byte test status
17.3.2 Low-byte alarm status
17.3.3 High-byte range
Value
Description
0
No test
1
Internal test
2
External test
Value
Description
0
No alarm
1
Pre-warning
2
Fault
3
Reserved
4
Warning
5
Alarm
Value
Description
0
=
1
<
2
>
3
Invalid