Modbus settings
Modbus settings
isoNAV685-D_D00215_02_M_XXEN/04.2017
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18.2.3 Modbus response
The response consists of 2 bytes per register. The byte sequence is defined with the Most
Significant Bit (MSB) first.
18.2.4 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
18.3 Measuring value information
18.3.1 High-byte test status
18.3.2 Low-byte alarm status
18.3.3 High-byte range
18.3.4 Low-byte unit
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
Value
Description
0
Invalid
1
None
2
Ohm
3
Ampere
4
Volt