------ Original Message ------
From: "Nicklas Karlsson" <[email protected]>
To: "Marius Liebenberg" <[email protected]>; "EMC developers"
<[email protected]>
Sent: 2017-09-11 17:46:49
Subject: Re: [Emc-developers] Mesa RS-422 hal example (canopen
messages?)
I have similar problem and plan to or actually already use CANopen
messages. One or more messages of the form 16 bit cob id + 8 bytes
payload and 16 bit modbus CRC at the en of the message(s). At least to
start with I implement only the parts I need. Real time communication
is usually implemented with all payload used for real time
communication and there is SDO messages for configuration or similar.
I would be happy to share the little code I have and cooperate. I have
still not checked the standards for sending CANopen messages over other
medium than CAN networks and any comments about this would be
appreciated.
That would be great.
Unless you already know it RS-422 is like ordinary UART with full
duplex communication and and differential signals which make possible
rather high communication speed although only between two nodes.
Yes I am aware of that. I will be using a very short packet message
system. The thing I cannot get my head around is how my compoenent will
interface with the mesa RS-422 port. Is it just a pin called MESA-XXX-RX
and MESA-XXX-TX and my component connect to that in hal or is it a low
level interface of sorts. For this I have ot seen any examples.
Regards Nicklas Karlsson
On Mon, 11 Sep 2017 13:40:09 +0000
"Marius Liebenberg" <[email protected]> wrote:
Hi
I asked this on the EMC list but thought it should be more relevant
here.
I need to write a custom RS-422 protocol to control a plasma cutter.
I
have a mesa 7i44 (amongst other's ) on the system.
I have never used or seen any examples of how to communicate to
custom
hardware via the RS-422 on the mesa cards. Is there anyone out there
that has some examples that I can look at to get started please?
Or some advise will do as well thanks.
-----------------------------
Regards / Groete
Marius D. Liebenberg
+27 82 698 3251
+27 12 743 6064
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