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Re: FT847 Null Modem



Pins 2 & 3 of an RS-232 cable are RXD & TXD, which stands for transmit data and
receive data.  They are NOT CTS and RTS as stated below.  They are crossed on
one end of the cable so that transmit data is sent to the receive data line on
the opposite end and vice versa.

73,

Woody
KJ4SO

-----Original Message-----
From: Fred Roberts <froberts@pe.net>
To: kf7lf@arrl.net <kf7lf@arrl.net>
Cc: amsat-bb@AMSAT.Org <amsat-bb@AMSAT.Org>
Date: May 01, 1999 01:32
Subject: Re: [amsat-bb] FT847 Null Modem


>John Johnson wrote:
>
>> Could someone explain what a "null modem" RS232 cable is when (9 pin)
>> compared to a straight cable...the info is needed for my FT 847..
>> Thanks,  I apologize if you receive two versions of this question.
>> 73   fer   now            John   KF7LF
>
>John-
>
>The pin connections you received tell you what to do, but it might help
>to have a word description to put meaning to the answer.  The concerned
>pins are labelled "Request to Send" and "Clear to Send".  By
>criss-crossing the connections, the cable always says, "I'm ready" and
>does so in both directions.
>
>73-
>Fred Roberts, W6TKV
>Riverside, CA
>
>----
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>To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>


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