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

[Jeff Hook]

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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