> Le 7 oct. 2018 à 03:16, Matthew D'Asaro <[email protected]> a écrit : > > Fellow time nuts, > Thanks to a very helpful (and generous) member of this list I now have a > Motorola VP Oncore for my 58503A. Unfortunatly, there appears to be another > problem somewhere with my 58503A. With the receiver installed it now appears > to pass its self test, at least it behaves as the manual says it should with > the power indicator illuminating immediately, followed a few seconds later by > the other lights each flashing in turn, and then the power light alone > remaining lit. At this point it should (again according to the manual) > present an 'scpi>' prompt on the serial port, but it does not. I am sure I > have the correct wiring between my computer and the unit because I can > measure the RS-232 TX line voltage coming from the 58503A on my PC's RX line.
What voltage are you finding? IIRC RS232 leaves a logic 1 i.e. -ve voltage on the line if not transmitting. You could try putting a scope on the RS232 chip TX driver input to see if the CPU is sending anything during startup. > I have tried the default serial port settings (9600 8N1) as well as other > baud rates with no success. > > Figuring that, if it will lock, I really don't care if it talks to my PC I > have left it outside connected to an antenna for the last five hours or so, > but I still haven't gotten it to lock. > It may not lock if it has a saved position which is far away. That happened for my Z3801A which is pretty much the same box and had come from China. I had to force it into survey mode. But that needs RS232 working. > Questions: > 1) Has anyone else experienced problems with these HP units failing to > communicate with the PC? Any solutions? > 2) Is there a service manual available anywhere? > 3) Does anyone know what the internal LEDs on the back of the board mean? > After powering it up and letting it sit for a few minutes the two red ones on > the far left (with the front of the receiver facing me) are on along with the > green one on the far right. The three red ones in the middle all flash on > momentarily every 15 seconds or so, then they go off again. > 4)Do you have any other hints? > > -Matthew > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. People have only as much liberty as they have the intelligence to want and the courage to take. Emma Goldman _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
