Sensor Electronics SEC 3000, Instruction And Operation Manual

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SEC 3120 16-bit Modbus Manual Page 42 Of 46 Sensor Electronics Corporation
For Version 1.2 and above December 2012 P/N 1580282, Rev. 1, 20121228
Response
Here is an example of a response to the query on the previous page:
If the register address in the query is not valid for a multiple register write
function, the SEC 3120 unit will issue an Exception 2 as a response. If the multiple
register write enable password register in the query did not include the proper 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, and an attempt to write to ALL sensors (address
range 42001 to 42100, except 42011- Zone ID & 42040- Self Test) it will generate an
Exception 3 response.
Write Multiple Holding Registers Response
Field Name Example (Hex)
Slave Address
11
Function Code 10
Address High 08
Address Low 46
Item Count High 00
Item Count Low 03
CRC Low Byte 61
CRC High Byte 2D
Response Exception 2
Field Name Example (Hex)
Slave Address 01
Function Code 86
Exception Code 02
CRC Low Byte C3
CRC High Byte A1
Response Exception 3
Field Name Example (Hex)
Slave Address 01
Function Code 86
Exception Code 03
CRC Low Byte 02
CRC High Byte 61
Response Exception 8
Field Name Example (Hex)
Slave Address 01
Function Code 86
Exception Code 08
CRC Low Byte 43
CRC High Byte A6