DCP200 Profile Controller & Recorder - Product Manual

Supported Modbus Functions

Modbus defines several function types. The following types are supported by this instrument:

Function Code (decimal)

03 / 04

06

08

16 (0x10 hex)

23 (0x17 hex)

Modbus Meaning

Read Holding/Input registers

Write Single Register

Diagnostics

Write Multiple Registers

Read/Write Multiple Registers

Description

Read current binary value of specified number of parameters at given address. Up to 64 parameters can be accessed with one Query.

Writes two bytes to a specified word address.

Used for loopback test only.

Writes up to 253 bytes of data to the specified address range.

Reads and Writes 253 bytes of data to the specified address ranges.

Function Descriptions

The following is interpreted from the Modbus Protocol Description obtainable from http://www.modbus.org/. Refer to that document if clarification is required.

In the function descriptions below, the preceding device address value is assumed, as is the correctly formed two-byte CRC value at the end of the QUERY and RESPONSE frames.

Function 03 / 04 - Read Holding/Input Registers

Reads current binary value of data at the specified word addresses.

 

 

 

 

 

QUERY

 

Function

Address of 1st Word

 

03 / 04

 

HI

 

LO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESPONSE

 

Function

 

Number of

 

First Word

 

 

 

Bytes

 

 

 

 

03 / 04

 

 

 

HI

 

LO

 

 

 

 

 

 

 

 

 

Number of Words

 

HI

 

 

LO

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Last Word

 

 

 

 

 

 

 

 

HI

 

 

LO

 

 

 

 

 

 

 

 

In the response the “Number of Bytes” indicates the number of data bytes read from the instrument. E.g. if 5 words are read, the count will be 10 (A hex). The maximum number of words that can be read is 64. If a parameter does not exist at one of the addresses read, then a value of 0000h is returned for that word.

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Serial Communications

51-52-25-150, Issue 1 – April 2009

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Honeywell DCP200 manual Supported Modbus Functions, Function Descriptions, Function 03 / 04 Read Holding/Input Registers

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