[time-nuts] Z3805 utility, Was: AW: (no subject)

Robert Benward rbenward at verizon.net
Sun May 23 21:41:10 UTC 2010


Jeff,
A plain serial cable will have 2&3 swapped, a "straight through" is 2-2 and 3-3.  There were a lot of DB25 to DB25 that 
were NOT serial cables, they were just 25 pin cable using DB9.

Bob


----- Original Message ----- 
From: "Jeff Hook" <jeffhook at comcast.net>
To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Sunday, May 23, 2010 5:24 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)


> Receive  data is pin 2 on DB9 and 3 on DB25
> Transmit data is Pin 3 on DB9 and 2 on DB25
> A straight thru cable with DB9 on one end and DB25 on the other will have pins 2 and three crossed
> A null modem cable, that is required for a Z3805A, will be pin 2 to pin 2 and pin 3 to pin 3
>
> Jeff
> ----- Original Message ----- 
> From: "Stanley Reynolds" <stanley_reynolds at yahoo.com>
> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
> Sent: Sunday, May 23, 2010 3:56 PM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
>
>
>
>
>
> ----- Original Message ----
> From: Jeff Hook <jeffhook at comcast.net>
> To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
> Sent: Sun, May 23, 2010 12:42:45 PM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
> Bob
> My 3805 cables look like this
>
> DB9 DB25
> 2 2
> 3 3
> 5 7
> (Null Modem)
>
> Jeff
>
> <snip>
>
> straight cable is 2 to 2 to 3 to 3
>
> null modem would be
>
> 2 3
> 3 2
>
> normal usage would be:
>
> terminal (straight cable) modem (phone line) modem (straight cable) computer
> computer (straight cable) modem (phone line) modem (straight cable) computer
>
> or if no modems :
>
> terminal (null modem) computer
>
> As has been mentioned many exceptions to the rule.
>
> Stanley
>
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