Re: RPGLE Socket Communication with Modbus -- RPG400-L

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]

Russell Wesh | Applications Supervisor
Sumitomo Drive Technologies
Sumitomo Machinery Corp. of America
Tel: +1-757-485-3355 ext. 8633
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