Point of clarification, on a PC RS-232 port, expect to find TxD (output) on pin 2 of a 25-pin D-sub, and on pin 3 of on a 9-pin D-sub.
This is a sign of terminal configuration (DTE), and a PC is conventionally a terminal. It would be surprising if your PC isn't. If you don't have a scope, a dc measurement can help clear the air. The resting state of the PC RS-232 TxD pin will be a negative voltage, expect anywhere between -5 and -12 (beyond that would be a little surprising). Easily measured because you can get right on the male pins. The RxD pin wont have much if any on it compared to the TxD. A RS-422 pin should generally not measure negative at all. Don't know the Z38xx family, but my tbolt is DCE, and hooks up with a straight 9-pin cable, which is very convenient as it can be a neat molded straight extension cable or mass-terminated ribbon. For this, you need to find negative resting TxD on pin 2 (so it goes to RxD on the PC). The original Mac had RS-422 (unipolar differential) characteristics that a lot of folks successfully wired directly to RS-232 (bipolar singe-ended), driving one of the differential RxD pins and choosing the right polarity of TxD. Success is mainly a matter of polarity, thresholds, length, and noise margins. Do the Z- boxes look for hardware handshaking? Ed -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of jmfranke Sent: Saturday, May 22, 2010 5:04 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) Have you looked at the serial connector with an oscilloscope? Pin 2 should be the output data. Pin 3 is for data going into the GPS. And pin 7 is ground. I use Z3801A systems which have a 25-pin connector. Other systems use a 9-pin serial connector. The only difference should be the ground which is on pin 5 for the 9-pin connector. Have you looked at: http://www.realhamradio.com/GPS_Frequency_Standard.htm John WA4WDL -------------------------------------------------- From: "Robert Benward" <rbenw...@verizon.net> Sent: Saturday, May 22, 2010 3:07 PM To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com> Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) > Hi All, > I hooked everything up and I still get nothing. I can't seem to establish > communications with the Z3805. I tried a null modem as well, in case the > cable (supplied) was wired with the wrong connector gender. I see a green > blinking light inside, it he left rear corner of the box. Everything is > warm, but nothing else. Any ideas? > > Bob > > > ----- Original Message ----- > From: "Robert Benward" <rbenw...@verizon.net> > To: "Discussion of precise time and frequency measurement" > <time-nuts@febo.com> > Sent: Saturday, May 22, 2010 9:49 AM > Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject) > > >> Hi Ulrich, >> Thank you for your response. I hope to try it today if I can get away >> from household duties. Will I need to leave the computer hooked up, or >> will it run stand alone once I set it up? >> >> Thanks, >> Bob >> >> >> ----- Original Message ----- >> From: "Ulrich Bangert" <df...@ulrich-bangert.de> >> To: "'Discussion of precise time and frequency measurement'" >> <time-nuts@febo.com> >> Sent: Saturday, May 22, 2010 5:50 AM >> Subject: [time-nuts] Z3805 utility, Was: AW: (no subject) >> >> >>> Bob, >>> >>> everything you need for the Z3805 is included in my Z38XX utility, that >>> has >>> already been mentioned. This includes sending commands to the receiver, >>> you >>> do not need another terminal program. I own a Z3805 myself and basically >>> I >>> have written the software for myself. A Z3801 manual in conjunction with >>> Z38XX should take you pretty far in either get it to run or otherwise >>> diagnose a fault. >>> >>> Best regards >>> Ulrich Bangert >>> >>>> -----Ursprungliche Nachricht----- >>>> Von: time-nuts-boun...@febo.com >>>> [mailto:time-nuts-boun...@febo.com] Im Auftrag von Robert Benward >>>> Gesendet: Samstag, 22. Mai 2010 03:15 >>>> An: time-nuts@febo.com >>>> Betreff: [time-nuts] (no subject) >>>> >>>> >>>> Hi, >>>> I just purchased a Z3805A at the Dayton hamfest this past >>>> weekend. How do I >>>> get it to work? Do I need software to run this, or can it >>>> run stand alone. >>>> I have turned it on, but only the power light comes on, the >>>> GPS lock, and >>>> more importantly, the enable light is not on. There is an >>>> 10MHz output, but >>>> the holdover light is not on. Is there any freeware available? Any >>>> recommendations? >>>> >>>> Any opinions on this one: >>>> >>>> http://cgi.ebay.com/GPS-Receiver-Program-HP-Z3801A-Z3805A-Z381 >>> 6A-58540A-/250566043297?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item3a56e666 >>> a1 >>> >>> Thank you in advance. >>> >>> Bob >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
