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Communication with Modbus

2CMC48001M0201 105 A43/A44

Revision: C User Manual

Error check (CRC), high byte

0x62

Error check (CRC), low byte

0xDE

Response frame Using function code 6, the response frame is an echo of the request frame.

9.2.3.1 Exception Responses

General If an error should occur while processing a request, the meter gives an exception

response that contains an exception code.

Exception frame An exception frame has the following structure:

Slave Address

Function Code

Exception Code

Error Check

In the exception response the function code is set to the function code of the

request plus 0x80.

Exception codes The exception codes that are used are listed in the following table:

Exception code

Exception

Definition

Illegal function

A function code that is not supported has

been used.

Illegal data address

The requested register is outside the

allowed range.

Illegal data value

The structure of a received message is

incorrect.

Slave device failure

Processing the request fail due to an

internal error in the meter.

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