Re: RPGLE Socket Communication with Modbus

[Alan Campin <alan0307d@xxxxxxxxx>]

Don't know if it would be of interest to you but I have a socket client at
www.think400.dk/downloads.htm. It is written in C and RPG. The RPG wrappers
the C functions.

It might be helpful to look at the socket code.

On Wed, Jul 10, 2019 at 12:55 PM Russell Wesh <russell.wesh@xxxxxxxxx>
wrote:

> 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
>
>
> [cid:image001.png@01D53737.D9A202A0]
>
>
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