Hi, I am working with PIC16F887 MODBUS COMMUNICATION. HERE THE PIC16F887 AS A MASTER AND COMTEST PRO TOOL AS A SLAVE.
I AM TRYING TO READ THE MODBUS FRAME FROM THE SLAVE. AFTER ESTABLISHING THE CONNECTION THE COMTEST PRO TOOL SHOWING NO RESPONSE RECEIVED MESSAGE IS SHOWING. HOW TO FIX THIS ONE. I CHECK THE BAUD RATE ,SLAVE ID,PARITY,DATA BITS ALSO. THE BELOW ATTACHED ONE IS THE CODE PLEASE CHECK.

 

A quick read of Baseblock's Comtest Pro software shows that it functions as Modbus Master/client, not as a slave server.

To test your your master you need to use Modbus server/slave software.

Here's some options for Modbus slave/server simulator Windows apps

1. PeakHMI Modbus TCP/IP slave simulator
PeakHMI Modbus serial RTU slave simlator
https://hmisys.com/

2. EasyModbusTCP/UDP/RTU .NET
Modbus TCP, UDP and Modbus RTU client/server library
https://sourceforge.net/projects/easymodbustcp/

3. ModRSsim2
https://sourceforge.net/projects/modrssim2/files/latest/download

4. Pepperl+Fuchs Modbus TCP/IP Client software (large 42Mb)
https://www.pepperl-fuchs.com/global/en/classid_1805.htm?view=productdetails&prodid=119716#software

5. Modsak_ Modbus test program - Wingpath (Master or slave) licensed app with 3 day trial 330 UK
https://wingpath.co.uk/modbus/modsak.php