[time-nuts] GPS-DC MK III serial IO question ...

Don Mimlitch donmeis at yahoo.com
Tue Mar 7 00:29:16 EST 2006


John:  I also recently acquired a GPS-DC on eBay and have it working.
  The XL-DC manual at this link:
  http://www.symmetricom.com/support/download_manual.aspx?DocID=463
  is very close to the GPS DC.
  
  You can use the Function 04 on the front panel to configure the RS232 port. Mine is set to 19200 Even Parity 7-Bits 1 Stop-bit.
  Configure HyperTerminal the same with Handshaking set to NONE. Also select a VT100 Terminal Emulation.
  You need a NULL Modem (to swap pins 2 and 3) and a Female-Female header since both the PC and the GPS-DC are DTE Devices.
  
  It is possible that the unit is configured for RS422. I have a TrueTime  XL-AK which has a RS422 serial port and I had to get a RS232/RS422  Converter on eBay. The manual for the XL-DC shows the pinouts for RS232  and RS422. You can probably use a Volt Meter on the pins to figure out  which way it is configured.
  
  When it is configured properly it should continuously put out The Time  Once per Second after Power Up until you hit Ctrl-C at which time it  will stop and you can enter F-Commands.
  Entering F08 will start it again. You might need to use F68 to set the  current year. Otherwise the Time might be off by about 20 Seconds.
  I hope this helps. If not, there are more things to try. 
  
  
  
  Good Luck
  Don Mimlitch
  donmeis at yahoo.com
  
  
    
    
    [time-nuts] GPS-DC MK III serial IO question ...        John Pettitt       jpp at cloudview.com         
        Mon Mar  6 20:41:50 EST 2006          
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hopefully somebody on this list has a TrueTime GPS-DC ...

I've just set up my new (to me) GPS-DC MK III.  It seems to be working
(gets a fix,  show itself as locked and the stats look fine).  The 1PPS
output works and is currently  syncing one of my NTP boxes.   However I
can't get the RS232 output to work.  What I'm seeing is anything I type
on the RS232 is ignored except <CR> which get a "?" is response.   The
book says F08<CR> should cause it to output time once a second but it
doesn't.

The data rate/parity etc is right so I'm stumped.  Is there some magic
to getting this thing to talk on the serial port?

John


                          
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