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Modbus Programming Manual ABOUT THIS MANUAL

Version 2 11

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Function 23 Hex - Read / Write Multiple Registers (0x17 hex)

Reads and writes the requested number of consecutive words (two-bytes) starting at the specified

addresses.

QUERY

Function

Read

Address

Number of

Words to

Read

Write

Address

Number of

Words to Write

Values to Write

Word

etc

Last Word

→

RESPONSE

Function

Number of Bytes

Read Data

Word

etc

Last Word

→

Note:

The number of data bytes that can be read and written in one message is 253 bytes.

Exception Responses

When a QUERY is sent that the instrument cannot interpret, an Exception RESPONSE is

returned. Possible exception responses are:

Exception Code

Error Condition

Interpretation

Unused

None.

Illegal function

Function number out of range.

Illegal Data Address

Write functions: Parameter number out of range or not

supported. (for write functions only).

Read Functions: Start parameter does not exist or end

parameter greater than 65536.

Illegal Data Value

Attempt to write invalid data / required action not executed.

The format of an exception response is:

RESPONSE

Function

Exception Code

Original Function code with its Most

Significant Bit (MSB) set.

as detailed above

Note:

In the case of multiple exception codes for a single QUERY the Exception code returned is

the one corresponding to the first parameter in error.

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