Query; Response - Honeywell UDC2800 Product Manual

Query

Example: Internal slave error reading 2 registers starting at address
1820h from slave at slave address 02.
02 03 18 20 00 02 CRC CRC

Response

Example: Return MSB in Function Code byte set with responder
Device Failure (04) in the data field.
02 83 04 CRC CRC
Table 13-1: Modbus RTU Data Layer Status Exception Codes
Exception
Definition
Code
01 Illegal
Function
02 Illegal Data
Address
03 Illegal Data
Value
Chapter 13 - Modbus Communication Exception Codes
Description
The message received is not an allowable action for the
addressed device.
The address referenced in the function-dependent data
section of the message is not valid in the addressed device.
The value referenced at the addressed device location is no
within range.
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