Sensor Electronics SEC Millenium Series Instruction And Operation Manual page 376

If the register address in the query shown previously is not valid for a preset
register function, the SEC 3120 unit will issue an Exception 2 as a response. If the preset
data in the query does not include the password, the SEC 3120 unit will issue an
Exception 8 as a response. If the SEC 3120 unit is not operating in identical sensor role
mode (for setting threshold values), it will generate an Exception 3 response.
Response Exception 2
Field Name
Slave Address
Function Code
Exception Code
CRC Low Byte
CRC High Byte
Response Exception 8
Field Name
Slave Address
Function Code
Exception Code
CRC Low Byte
CRC High Byte
SEC 3120 16-bit Modbus Manual
For Version 1.2 and above
Example (Hex)
01
86
02
C3
A1
Example (Hex)
01
86
08
43
A6
Page 37 Of 46
December 2012
Response Exception 3
Field Name Example (Hex)
Slave Address
Function Code
Exception Code
CRC Low Byte
CRC High Byte
Sensor Electronics Corporation
P/N 1580282, Rev. 1, 20121228
01
86
03
02
61