> I am looking for a driver which would work with Palm Pilot devices for communication with Modbus RTU.
I am not sure if this is what you are looking for, but I have used pocketHMI by narly software to browse and edit the data tables in Allen-Bradley SLC's.
Depends on what you need, but some SCADA softwares from the market that supports Windows CE already have the Modbus driver developped. Such as P-CIM for Windows CE from Afcon (www.afcon-inc.com), currently supports the following communication drivers:
For Serial type connections - Modbus
For TCP/IP type protocols - Modbus TCP/IP
You can find at the website the distributor nearest from you.
You could implement a simple Modbus RTU master and download it to your palmpilot using the freewares available at different sites. If you require programming and other assistance, contact me outside the list.
I have written a simple application to read modbus registers. Screen shots can be seen at http://www3.sympatico.ca/rob.deb/mbcom.html along
with contact info to get the software. If you are interested in obtaining my source code to date, please drop me a line.