Experimental Physics and
Industrial Control System

Folks,

 

I have made a major re-write of the EPICS “modbus” module.  This is from the Release Notes:

 

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Release 3-0

 

June XXX, 2019

 

This is a major rewrite of the driver, changing from C to C++ inheriting from asynPortDriver. The major reason for the change is to be able to invoke the class methods such as drvModbusAsyn::doModbusIO() from other drivers. This allows drivers that communicate with Modbus devices to call methods to perform the Modbus I/O directly, which was not possible with the previous C API.

 

The new driver should be completely backwards compatible with previous versions, so no changes to IOC startup scripts or OPI displays are required.

 

A new example program, testClient.cpp, has been added. This program demonstrates how to instantiate a drvModbusAsyn object and use it to perform Modbus I/O to an external device. This example is a pure C++ application running without an IOC. The same code could be used in a driver in an IOC.

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The new code is in the asynPortDriver branch on Github.   https://github.com/epics-modules/modbus/tree/asynPortDriver

 

I have also tagged the current version as R3-0-RC1.

 

I have tested the new version with the Modbus Slave simulator, and it appears to work just like R2-11.

 

However, before I release R3-0 with this new code I would really like to have more testing done.  If you have an existing installation with real hardware and can test the new version I would really appreciate it.

 

Thanks,

Mark