B&B Electronics GW-7552 - Quick Start Guide - Manual (Page 8)

GW-7552 PROFIBUS/MODBUS GATEWAY Quick Start User Guide (Version 1.30) PAGE：8
area of Profibus master device and then set the value of the first byte from 0
to 1 to trigger the data output command.
--Send Command to read DI of the GW-7552 again
Now the user can input command (” 01 02 00 00 00 10”) in MBRTU and
click button to send Modbus command again. Then
MBRTU can receive response message (” 01 02 02 FE DC F8 41”). In this
message, the user can know the value of DI0 & DI1 have changed into
“0xFE” & “0xDC” in the GW-7552, as shown in the below.
Set output data and trigger output data command
Module Byte Data type Representation Value
Output 0 Byte Hex 0x00
→
0x01
Output 1 Byte Hex 0x00
System
module
Output 2 Byte Hex 0x00
Output 3 Byte Hex 0x00
→
0xFE
Output
module
Output 4 Byte Hex 0x00
→
0xDC
Send Modbus command to read DI of the GW-7552 and receive data (0xFE, 0xDC)