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Old February 21st, 2003, 01:08 AM   #1
seppoalanen
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abbreviations as RS232C

Hello World !

RS232C comes from Recommended Standard nr. 232 version C.

In this forum have peoples from diffrend time zones and that is very helpful becourse somone have allways awake so answer can come soon if we understand all 3-letter abbreviations.

Please explain those abbreviations, sometimes they don't tell me anything, but when somone explain them I understand what was the point.

Some drawing or ladder list can also help much more than 1000 word for my limited English, maybe someone else have same kind of problems even they speak English very well.
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Old February 21st, 2003, 01:30 AM   #2
ndzied1
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The Classic definitions are:
pin listed is for 25 pin connector, number in brackets [] is for 9 pin connector

Pin 1.[5] Ground
Pin 2.[3] TD Transmitted Data
Pin 3.[2] RD Received Data
Pin 4.[7] RTS Ready to Send (RS232 "standard" dfinition)
RFR Ready For Receiving (when flow control active)
Pin 5.[8] CTS Clear to Send (in a full duplex setup usually always asserted or tied to DCD)
Pin 6.[6] DSR Data Set Ready
Pin 8.[1] DCD Data Carrier Detect
Pin 20.[4] DTR Data Terminal Ready
Pin 22.[ ] RI Ring Indicator

At a minimum, TD, RD and ground are required to set up communications.

I'm sure there are many online sites you can search for more definition of each of the signals. Here is one I just found with a google search on RS232 Definitions:
http://www.camiresearch.com/Data_Com..._standard.html

It really depends on what devices you are communicating between as to what you need to do. The "standard" applied by different vendors to suit their own needs so it really can be device dependant which signals are required.

If you are programming your own interface to something, an invaluable reference is the "C Programmer's Guide to Serial Communications" Published by Sams Publishing ISBN 0-672-30286-1

Hope this helps
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Last edited by ndzied1; February 21st, 2003 at 01:33 AM.
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Old February 21st, 2003, 04:05 AM   #3
jvdcande
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Seppo,

I can understand your frustations about abbreviations. I'm involved in a European co-operation for vocational training called EVTA (European Vocational Training Association) and I have noticed that even the abbreviation PLC is not known everywhere in Europe. I was asked some time agoo by a German what PLC ment. They use a different name over there.

As far as I know these are the different abbreviations used for PLC in Europe (sorted by language):
[list][*]Dutch: VPS for "Vrij Programmeerbare Sturing"[*]English: PLC for "Programmable Logic Controller" (for those among us who didn't know or already have forgotten )[*]French: AP for "Automate Programmable"[*]German: SPS for "Speicher Programmierte Steuerung" or AG for "Automatisierungs Gerät"[/list=a]

If anybody knows more of these national terminology, I'm always interested because I often communicate with people from other countries. Maybe someone knows a dictionary with technical terminology. Every info about this is always very welcome !
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