On 22/02/18 17:39,
helgayork1@gmail.com wrote:
On Thursday, July 23, 1998 at 10:00:00 AM UTC+3, Melo wrote:
I need to communicate srially between a plc (AB PLC5 - via a
Prosoft card) and a DCS (Moore Products APACS). I can do it using
either the RS422 protocol or RS485. I don't know what the
differences between these protocols are. Any information would be
appreciated. Is there an advantage in using one over the other?
Ed
Hi! RS485 is a standard for serial data transmission. Data exchanged
through RS485 interfacing primarily uses the MODBUS protocol. RS232
devices use text (ASCII) protocols. This difference implies that
needs to know about the MODBUS when using RS485 communication
devices. Learn more about RS485 and MODBUS here - https://www.eltima.com/article/modbus-vs-rs485/
I applaud your enthusiasm to help. And it's nice to see an on-topic
post in this virtually dead newsgroup. However, there are two key
problems with your post.
1. You are answering a question that was asked 20 years ago. I assume
the OP has either found the answer some where else, or given up waiting
by now.
2. Your answer is completely wrong.
If you are interested in knowing the difference between RS-485 and
RS-232, you can ask and I am sure there are a few lurkers here who will
help (or you could ask in a more lively group). If you just want to
advertise for a somewhat muddled web article, then you have succeeded.
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