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

[Steve Rooke]

On 24 May 2010 12:48, Robert Benward <rbenward at verizon.net> wrote:
> Jeff,
> I just measured one of my " plain serial" cables, it's 2-2 and 3-3.  Now I'm
> really confused!!!
>
> "TX" and "RX" have the same pin numbers, so a DCE to DTE needs 2&3 swapped.
>  Does that mean a DCE to DTE needs a null model, or is that the other way
> around?????

Connecting a DTE to a DCE requires a pin for pin straight cable. The
labelling of the pins is DTE specific.

> I always feel like an amateur when playing with RS-232.....

More people have trouble with RS-232 than many other things so your
not on your own.

Steve

> 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 7:09 PM
> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
>
>
>> 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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>>>>
>>>>
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>>>
>>>
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>>
>>
>>
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>
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-- 
Steve Rooke - ZL3TUV & G8KVD
A man with one clock knows what time it is;
A man with two clocks is never quite sure.