Re: [Elecraft] Long RS232 Runs - RS422

2016-01-22 Thread David Woolley
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

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-22 Thread Cliff Frescura
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

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread Jim Brown
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

[Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread Michael Walker
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.

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread Michael Walker
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

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread WILLIS COOKE via Elecraft
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

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread Cliff Frescura
, 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

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread Clay Autery
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

Re: [Elecraft] Long RS232 Runs - RS422

2016-01-21 Thread Michael Walker
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