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On 7/10/2019 3:54 PM, Russell Wesh wrote:
I am hoping to get some assistance to communicate in RPGLE with a pick to light device that uses Modbus protocol
My personal experience with low level communications is that there are
two learning curves that need to be climbed:
1) How does the protocol work?
2) How to make RPG implement the protocol?
I myself have not had any experience starting with (2) before finishing
(1). If you have experience with other communications, set up a working
environment with the vendor's application and sniff the communications.
Wireshark is one such sniffer.
Modbus is an old protocol. The canonical reference is at
http://modbus.org/ In particular look under Technical Recources and try
the TCP Toolkit. That should get a 'known working' bit of code running
with your device. This will enable you to sniff out what a working
exchange looks like.
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