Despatch Protocol Plus Modbus Communications Manuale Utente Scaricare il pdf (Pagina 40)

Chromalox Instruments and Controls

A-51643 Rev. 6 10/06/03 34

Data hi

$00

Data hi

$00

Data lo

$00

Data lo

$03

CRC

$----

CRC

$----

5.3.2 [17] Report Slave ID

Requests the slave to return its ID code. The ID code identifies the product line of which the slave is a

member. The Slave ID for Protocol

Plus is 1. Besides the ID code, the slave‘s software version

number is also returned as an ASCII string. The version number will be sent in the format ―VXX.X‖.

Query

Example: Report Slave ID from slave address 15 whose software version is 5.0.

Field Name

Data

Slave address

$0F

Function

$11

CRC

$----

Response

The normal response is to echo the slave address and function code, supply a data byte count, return the

slave ID code, and return the software version number string.

Example: Response.

Field Name

Data

Comment

Slave address

$0F

Function

$11

Byte Count

$06

Slave ID

$01

Protocol

Plus ID code

Version number hi byte

$56

‗V‘

$30

‗0‘

$35

‗5‘

$2E

‗.‘

Version number lo byte

$30

‗0‘

CRC

$----

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 52 53

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