Kaviarasan

You can try Modbus protocol tester (master) which is free for download from here:http://www.colwaysolutions.com/modbus-protocol-tester.php   For a slave, you can find a Modbus RTU and TCP slave implementation in 'C' source code form at http://www.colwaysolutions.com.   Since the implementation is in ANSI 'C' you can port it easily to any controller.  **Slave supports following 11 function codes. Read Coils(0x01), Read Discrete Input(0x02), Read Holding register(0x03), Read Input register(0x04), write single coil(0x05), write multiple coils(0x0F), write multiple registers(0x10), write single register(0x06), Read exception status(0x07), Report slave ID(0x11), Read/write multiple registers(0x17)**   The vendor also provides ports to a few popular microcontroller cores like 8051, ARM, Coldfire, Analog devices, Microchip, etc.    Including for some RTOS kernels (OS9, MQX, UC-OS). The library is very lightweight consuming negligible RAM and ROM space. A slave is not free but the pricing seems to be low. They also provide porting services for getting library ported to your board and working at minimal cost.     Using Modbus Protocol tester (master) and WIN32(C source code) Modbus slave, you can establish client/server Modbus communication between two different PCs.

You can try Modbus protocol tester (master) which is free for download from here:http://www.colwaysolutions.com/modbus-protocol-tester.php A free version of MPT supports only Modbus TCP.   We do have a full version of MPT which supports both TCP and RTU communication and also has a feature of Modbus Automation where multiple commands can be sent using an XML script and results gets validated automatically.   For inquiry on a full version of MPT contact : sales@colwaysolutions.com

Look for Modbus Master and slave implementation user manuals by COLWAY SOLUTIONS from here: http://www.colwaysolutions.com/usermanual.htm

You can try Modbus protocol tester (master) which is free for download from here:http://www.colwaysolutions.com/modbus-protocol-tester.php

You can try Modbus protocol tester (master) which is free for download from here:http://www.colwaysolutions.com/modbus-protocol-tester.php   For a slave, you can find a Modbus RTU and TCP slave implementation in 'C' source code form at http://www.colwaysolutions.com.   Since the implementation is in ANSI 'C' you can port it easily to any controller.  **Slave supports following 11 function codes. Read Coils(0x01), Read Discrete Input(0x02), Read Holding register(0x03), Read Input register(0x04), write single coil(0x05), write multiple coils(0x0F), write multiple registers(0x10), write single register(0x06), Read exception status(0x07), Report slave ID(0x11), Read/write multiple registers(0x17)**   The vendor also provides ports to a few popular microcontroller cores like 8051, ARM, Coldfire, Analog devices, Microchip, etc.    Including for some RTOS kernels (OS9, MQX, UC-OS). The library is very lightweight consuming negligible RAM and ROM space. A slave is not free but the pricing seems to be low. They also provide porting services for getting library ported to your board and working at minimal cost.     Using Modbus Protocol tester (master) and WIN32(C source code) Modbus slave, you can establish client/server Modbus communication between two different PCs.