DCP200 Profile Controller & Recorder - Product Manual

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.

Function

17

 

 

 

 

 

 

 

 

 

QUERY

 

 

 

 

 

 

 

 

 

 

 

 

1st Read

 

Number of

 

1st Write

 

Number of

 

 

 

 

Values to Write

 

 

 

 

Address

 

Words to

 

Address

 

Words to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Read

 

 

 

 

Write

 

1st Word

 

2nd Word

 

etc

 

Last Word

 

HI

LO

 

HI

LO

 

HI

LO

 

HI

LO

 

HI

LO

 

HI

LO

 

 

HI

LO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESPONSE

 

Function

 

Number of

Bytes

17

1st Word

HI

LO

 

 

 

Read Data

 

2nd Word

 

 

etc

HI

 

LO

 

 

 

 

 

 

 

Last Word

HI

LO

 

 

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

00

Unused

None.

 

 

 

01

Illegal function

Function number out of range.

02

Illegal Data Address

 

 

03

Illegal Data Value

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.

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.

Page 82

Serial Communications

51-52-25-150, Issue 1 – April 2009

Page 82
Image 82
Honeywell DCP200 Function 23 Hex Read / Write Multiple Registers 0x17 hex, Exception Responses, Function Exception Code

DCP200 specifications

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