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

Rex rexa at sonic.net
Sun May 23 11:38:52 UTC 2010

I see Ulrich was sending the message below as I was composing the other 
message I just sent. I think we have both given information about the 
serial connection that should be helpful.

Please note one thing that I included in my other message, that I 
confirmed tonight. The Z3805A serial port defaults to 9600 8 N 1 but all 
of those parameters can be changed with commands. The PC software must 
be configured to match or there will be no communication. I didn't 
power-cycle my Z3805 but I assume if I changed the port parameters and 
then powered off/on the z3805, it would probably retain this new port 

Ulrich Bangert wrote:
> Bob,
> even without a computer connected the beast should do SOMETHING. In
> conjunction with a pc and a running communication it is easier to judge WHAT
> it currently does. 
> To establish communication first find out what pinning the RS232 connector
> has: with the negative cable (black) of a voltmeter connected to Pin 7 of
> the RS232 connector check pins 2 & 3 with the positive cable (red) for the
> presence of a NEGATIVE voltage of a few Volts. If you can measure a negative
> voltage on one of the pins, you have successfully identified the Z3805's
> TRANSMIT pin. The other pin of 2/3 is the receive pin. 
> Then solder a cable in this way
> Z3805 Transmit pin  -> Pin 2 of pc RS232 port (9 pole D-Sub assumed)
> Z3805 Receive pin   -> Pin 3 of pc RS232 port (9 pole D-Sub assumed)
> Z3805 Ground (7)    -> Pin 5 of pc RS232 port (9 pole D-Sub assumed) 
> Should you have a 25 pin connector for RS232 at your pc then the cable is
> Z3805 Transmit pin  -> Pin 3 of pc RS232 port
> Z3805 Receive pin   -> Pin 2 of pc RS232 port 
> Z3805 Ground (7)    -> Pin 7 of pc RS232 port
> No other connection is needed. With a cable like this start Z38XX and check
> that you that you choose the correct Com-Port for communication in the
> Parameters window. And yes, I know, being an owner of a Z3805 I should know
> exactly but I don't remember the day that I made the cable and I currently
> cannot access the back of my Z3805. 
> Best regards
> Ulrich Bangert 

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