The +/- 3 volts levels are requirements on the driver, not the receiver.
In practice, receivers have quite a small hysteresis, and the
threshold points are set to meet the requirements of a type 1 interface
as defined in section 7 of ITU-T V.28. Whilst the specified purpose of
this is that a
olley
Sent: Friday, January 22, 2016 6:45 AM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Long RS232 Runs - RS422
The +/- 3 volts levels are requirements on the driver, not the receiver.
In practice, receivers have quite a small hysteresis, and the threshold
points are set to meet the re
On Thu,1/21/2016 10:32 AM, Michael Walker wrote:
I wanted to mention that for those that want long RS232 runs for devices
(Steppir, Rotator, Elecraft Amp),
It helps to define "long." Distance for RS232 was originally defined in
feet. Many years ago, it was redefined in terms of capacitance
All
I wanted to mention that for those that want long RS232 runs for devices
(Steppir, Rotator, Elecraft Amp),
I have been using these commercially for some time with great success.
They are made in the US and are pretty reasonably priced at about $35
each. Of course, you need a pair of them.
I agree with Jim.
I have pushed long runs of RS232 at lower baud rates (4800) out to about
1000' for some temporary commercial applications.
Some of us just try it and see if it works, and others want to do what is
know to work.
Me, I'm a just try it type of person.
Mike va3mw
On Thu, Jan
oup.com>
To: elecraft@mailman.qth.net
Sent: Thursday, January 21, 2016 12:44 PM
Subject: Re: [Elecraft] Long RS232 Runs - RS422
On Thu,1/21/2016 10:32 AM, Michael Walker wrote:
> I wanted to mention that for those that want long RS232 runs for devices
> (Steppir, Rotator, Elecraft Amp),
It
,
Cliff K3LL
-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of WILLIS
COOKE via Elecraft
Sent: Thursday, January 21, 2016 11:53 AM
To: j...@audiosystemsgroup.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] Long RS232 Runs - RS422
The old criteria
This one is rated to 1250 meters... with CAT-3 cable (TELCO). Use
better cable and proper terminations and you MIGHT be able to extend
that a bit. Add an inline amp/repeater, and the distance could be
extended to... well... a long way...
How far you need to go?
73,
__
Clay
For me at my remote, it is only 100ft, so I am using RS232 for the rotator
and the steppir.
For a big ski race in Kitzbuhel Austria, we pushed RS485 (1/2 duplex) 6000m
at 19200 without an issue.
Mike va3mw
On Thu, Jan 21, 2016 at 3:25 PM, Clay Autery wrote:
> This one is
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