Prosoft-technology 5201-MNET-ASCII Manual de usuario descargar pdf (Pagina 63)

MNET ♦ ProLinx Gateway Modbus Protocol Specification

Modbus TCP/IP Interface Module Driver Manual

ProSoft Technology, Inc. Page 63 of 78

September 1, 2010

4.7.1 Sub-function codes supported

Only Sub-function 00 is supported by the MNET gateway.

The data passed in the request data field is to be returned (looped back) in the

response. The entire response message should be identical to the request.

00 Return Query Data

Sub-function Data Field (Request) Data Field (Response)

00 00 Any Echo Request Data

Here is an example of a request to remote device to Return Query Data. This

uses a sub-function code of zero (00 00 hex in the two-byte field). The data to be

returned is sent in the two-byte data field (A5 37 hex).

Example and state diagram

Request Response

Field Name (Hex) Field Name (Hex)

Function 08 Function 08

Sub-function Hi 00 Sub-function Hi 00

Sub-function Lo 00 Sub-function Lo 00

Data Hi A5 Data Hi A5

Data Lo 37 Data Lo 27

The data fields in responses to other kinds of queries could contain error counts

or other data requested by the sub-function code.

1 2 ... 58 59 60 61 62 63 64 65 66 67 68 ... 77 78

Sin comentarios

Prosoft-technology 5201-MNET-ASCII Manual de usuario Pagina 63