I have Modbus Slave protocol Library for QNX in C++, I have written code to communicate with slave server, It is connecting to server properly but when I am sending data through RS232/RS485, here I am not sure whether server is recieving data or not. Can anyone help me what should I do to send & receive data from slave server.

I have overridden all the methods of MbusDataTableInterface, When this method is being called by server I am not getting. Can you help me?

 

Hello,
Download the free MODBUS slave from http://www.peakhmi.com/ and test your master.

This will validate your master code and then you can address the slave code.

Good luck,

Mark

 

We have a modbus RTU master that you can download at ftp://ftp.icpdas.com/pub/cd/8000cd/napdos/modbus/modbus_utility/ as part of a utility package that goes with our hardware. The RTU master is MBRTU.exe. With this tool you can issue commands and see what the response is. There is no charge. For support on the tools you would need to purchase some of our hardware, but using it is pretty self evident.

Eric Ratliff
www.icpdas-usa.com