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" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Sunday, May 23, 2010 3:56 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
----- Original Message ----
From: Jeff Hook <[email protected]>
To: Discussion of precise time and frequency measurement
<[email protected]>
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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