RPGLE Socket Communication with Modbus

Good Afternoon

I am hoping to get some assistance to communicate in RPGLE with a pick to light device that uses Modbus protocol
I believe I should be able to do this by following Scott Klement's Socket programming guide but I am having some issues with the communication.

Currently I have the pick to light device plugged into COM port 7 of my PC via USB.
I am then using demo version of TCP-Com software to allow my PC to act as a server to which my Socket Client program on the Iseries can connect to and communicate with.

I am using the CLIENTEX1 tutorial program as a base for my personal socket client program with the major changes being no entry parameters and no receiving of data (For now I simply want to write to a single register and get something to happen on the device).

When I run my program I have confirmed that the connection is established and program runs all the way from beginning to end but nothing is actually happening with the device.
I believe the issue is with what I am sending (request variable) and I'm unsure if I should even be performing translations to ASCII as well.

Below is a sample of my program with further details. Does anyone have any experience with this and can provide me with more direction?
I would like to send the value 1 to 16 bit input register 6302. My slave ID should be default 1.

Thank you in advance.

https://code.midrange.com/4bfa64631f.html


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Russell Wesh | Applications Supervisor
Sumitomo Drive Technologies
Sumitomo Machinery Corp. of America
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