What is an RS-232 transceiver?

[Robin]

Hello All,
I am trying to do some work with embedded systems, but have no
background in EE. Can anyone tell me what an RS-232 transceiver does,
and what are its input and output pins for?

Thanks in advance.

 

[Peter Bennett]

On 20 Mar 2004 09:03:17 -0800, Robin@HimalayanHandicraft.org (Robin)
wrote:

Hello All,
I am trying to do some work with embedded systems, but have no
background in EE. Can anyone tell me what an RS-232 transceiver does,
and what are its input and output pins for?

Thanks in advance.

An RS-232 transceiver, such as a MAX-232, is a level translator and
inverter. The serial I/O on a microcontroller is TTL levels, with a
logic 1 being 3-5 volts, and a 0 being near zero volts. RS-232 levels
are inverted, and typically +/-12V or so (I think the spec allows 3 -
25 volts). An RS-232 "1" is a negative voltage, and a "0" is a
positive voltage, so the transceiver has to invert the signal, and
increase the voltage swing.


--
Peter Bennett, VE7CEI
peterbb (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
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[CFoley1064]

Subject: What is an RS-232 transceiver?
From: Robin@HimalayanHandicraft.org (Robin)
Date: 3/20/2004 11:03 AM Central Standard Time
Message-id: <af190b62.0403200903.568517ec@posting.google.com

Hello All,
I am trying to do some work with embedded systems, but have no
background in EE. Can anyone tell me what an RS-232 transceiver does,
and what are its input and output pins for?

Thanks in advance.

http://www.arcelect.com/rs232.htm

http://www.lvr.com/serport.htm

Good luck
Chris