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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
Example (Hex)
01 86 02 C3 A1
Response Exception 3
Field Name
Slave Address Function Code Exception Code CRC Low Byte CRC High Byte
Example (Hex)
01 86 03 02 61
Response Exception 8
Field Name
Slave Address Function Code Exception Code CRC Low Byte CRC High Byte
Example (Hex)
01 86 08 43 A6
SEC 3120 16-bit Modbus Manual Page 37 Of 46 Sensor Electronics Corporation For Version 1.2 and above December 2012 P/N 1580282, Rev. 1, 20121228
