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

Jeff Hook jeffhook at comcast.net
Sun May 23 23:09:24 UTC 2010


Bob,
Serial ports have always been tough to get working right.
I guess I shouldn't call a serial cable, a straight cable.
I just want to differentiate it, from a null modem cable.

I made up my own cables when I got my Z3805A's
9pin on computer end and 25 pin on 3805
I wired 2-2, 3-3, and 5-7 and it worked.

Their is also a program called GPS-dos2 that you can download from 
http://www.realhamradio.com/gps-satstat-software.htm
It runs thru all baud rates, trying to communicat with the 38xx
You could give that a try.

Jeff

----- Original Message ----- 
From: "Robert Benward" <rbenward at verizon.net>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Sunday, May 23, 2010 4:41 PM
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)


> 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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