[tacgps] TAC-2 Oncore serial

[Bill George]

@@Cg sets idle or position fix mode.

@@Cg00 sets it to idle
@@Cg01 sets it to position fix
@@Cg02 reports current mode

* Bill George, Senior Field Tech
* Day Wireless Systems Inc.
* 234 NW 14th Ave, Portland OR 97209
* phone (503)228-9292  x2519
* fax (503)228-2439
* Nextel (503)209-6933 or 112*4*28

-----Original Message-----
From: tacgps-bounces at tapr.org [mailto:tacgps-bounces at tapr.org] On Behalf Of Pete Ashdown
Sent: Tuesday, July 19, 2011 2:02 PM
To: tacgps at tapr.org
Subject: Re: [tacgps] TAC-2 Oncore serial

On 07/16/2011 05:09 AM, Thomas Laus wrote:
> Pete Ashdown [pashdown at xmission.com] wrote:
>> Thanks for your suggestion.  I am running Linux and I have a Garmin 
>> GPS-18 on COM2 (ttyS1) and it is functioning just fine.  I will try 
>> testing the cable, but I have tried two different cables to no avail.
>>
> Pete:
> The command to change modes from idle to position mode is @@Cg
>
> The Showtime DOS program made this happen when switching the 
> navigation mode from NMEA to Motorola Binary or back.  The WinOncore12 
> program can send the binary commands in a window.  You will need a 
> Windows computer with a serial port to run WinOncore or an old DOS 
> computer to load Showtime to get your receiver out of the idle mode.  
> This mode is unique to the VP vintage and was not available in the later receivers.
>
> Tom KH6ILT

Shouldn't ntpd be able to do this?  My old Linux 2.4 box had no problem communicating with the TAC-2 Oncore, but I don't see any reference to "@@Cg" in the refclock_oncore.c code.  I've been using minicom (9600/8N1) to try and communicate with it, and @@Cg doesn't appear to do anything. 
I've tried switching the TX/RX via JP1 and still can't get anything to work.  I also tested each pin on the cable today and it all looks good. 
Hair pulling problem!