I just bought a three of these boards from Taobao. I'm running them at 12VDC input (which had been suggested on the time-nuts list), though the board seemed OK at 9V, too. The oven uses 5V, and I couldn't find any regulated voltages above 5V. Someone had written 9V on the power input connector.
Example GETVER strings:
| $GETVER | OCXO | GPS | Note |
| $GETVER 12.0.1 0.4850266.0.1 19 fbde 7437 06162200B0000A2004183ACC | Bliley NV47A1282 | GT-8031A | My board #1 |
| $GETVER 12.0.1 0.4850266.0.2 19 fbde 7437 06162200C1000A200442A35F | Bliley NV47A1282 | GT-8031B | My board #2 |
| $GETVER 12.0.1 0.4850266.0.5 19 fbde 7437 06162200C2000A2009350093 | CTS 1960017 | GT-8031F | My board #3 |
| $GETVER 10.1.2 BOOT 10 9e05 7437 06162200C1000A2005411C55 | Bliley NV47A1282 | GT-8031F | Packrat Board |
I put together a quick control program for Windows, for ease of debugging. I thought that I should post the commands that I've discovered, as I've not seen any list other than the PackRat PPT which was for older firmware.
// Based on FW 12.0.1
// Commands:
//
// $PROCEED [Send at startup to get past the bootloader]
//
// $FACT [Factory preset]
// $GETBDELAY [returns board delay, nanoseconds]
// $GETDELAY [returns cable delay, nanoseconds]
// $GETPOS [return position ]
// $GETSCALEFACTOR [Returns a float, such as 3.742106e-3]
// $GETVER [returns version info]
// $KALDBG <0|1> [Enable reporting of Kalman filter parameters]
// $PPSDBG <0|1> [Enable or disable timing information every second]
// $RESET [Unit software reset]
// $SETBDELAY <n> [-32 <= n <= 32, Set board delay, PPS4 units (roughly 5 or 6 ns). PPS4 is controlled to equal this value]
// $SETDELAY <n> [-32768 <= n <= 32767Set cable delay, nanoseconds]
// $SETPOS <n> <n> <n> [set position to Lat/Long/Elevation_MSL, send value returned by survey]
// $SURVEY <n> [survey for n hours, default is 8]
// $TRAINOXCO [Start OXCO Training. This restarts the board ($PROCEED needed), and measures freq
// change with 500 ADC count]
// $UPDATE FLASH [update flash memory settings]
//
// Other unknown commands:
// $GETA [returns -1; Attenuator?]
// $GETP [returns -1 255; Potentiometer?]
// $SET1PPS ["$SET1PPS 0"/"$SET1PPS 1"] seems to go to a manual holdover mode, and status changes to 3]
// [Seems to return to normal a few minutes after "$SET1PPS 1 1"
(Status goes 8,16,17,18,0]
//
// Messages:
// $STATUS
// 1: (Maybe 10 MHz bad, based on packrat docs)
// 2: (Maybe PPS bad, based on packrat docs)
// 3: Antenna is bad? 0=good
// 4: Holdover duration (secs)
// 5: Number of sats tracked (different than, but within 2 of $EXTSTATUS, perhaps only counts channels 0-7???, range is 0-8)
// Status [Locked = 0, Recovery = 1, (Forced holdover?)=3, Train OXCO=7, Holdover = 8,
// [Startup A/B/C/D = 10/11/2/19 ]
// [ (transition from 1 to 0) = (14,15,16,17,18) ] Wait states when transitioning
// [ (transition from 0 to 1) = (20,21,22) ] Wait states when transitioning
// (6 = locked, but unknown location?)
//
// $PPSDBG 1187153266 3 25.28081e3 -253 -6 2 2 0.0
// 1: same as clock (GPS Time)
// 2: Same as $STATUS status, but updates much more often (and seems to skip states less often)
// 3: Floating point number. Output voltage. Tends towards 29e3 on my board. Proportional to the DAC voltage
// On my RevC CTS board, Vbias ~= 6.25e-5*PPS3. This may make sense for a 4.096 V reference: 4.096/2^16=6.25e-5
// During startup, it is not put in the result string (this field is blank, so two sequential space characters are in the string)
// 4: Measured phase offset? Units seem something like 6.5*ns
// 5: Looks like a saw-tooth between -15 and 15 (or so). Perhaps the quantization error reported by the GPS module?
// 6: Normally 0, but sometimes 2 (related to holdover/startup?)
// 7: Normally 0, but sometimes 1 or 2 (related to holdover/startup?)
// 8: Always 0.0?
//
// $EXTSTATUS
// 1: SurveyStatus [0=normal, 1=surveying]
// 2: Number of sats (different than, but within 2 of $STATUS, perhaps only counts channels 0-9, range is 0-10)
// 3: DOP (maybe TDOP?)
// 4: Temperature (close to FPGA? close to oven?) (my board reads about 45C)
//
// $GETPOS (sent after setting position, or requesting position
// Latitude
// Longitude
// Elevation_MSL
// Correction to MSL to get WGS elevation (add this value to MSL to get WGS ellipsoid)
// Status flag [(Normal?)=0 on 196 board or =2 on Bliley board, Surveying=3], or maybe a FOM?
//
// $SURVEY 40448488 -86915296 225 -34 7129
// [sent during a survey]
// 1: Latitude
// 2: Longitude
// 3: Elevation_MSL
// 4: Correction to MSL to get WGS elevation (add this value to MSL to get WGS ellipsoid)
// 5: Number of seconds remaining
//
// $SAT
// Channel # (0-based, seems to only return channel 0 through 7)
// GPS Sattelite number
// Elevation (degree)
// Azimuth (degree)
// SNR (dB*Hz)
//
// $CLOCK 1187156731 18 3
// GPS UNIX-timestamp (secs since 1970), but my board is off by 10 years (reporting 2007 while it is 2017)
// Count of leap-seconds
// Time figure-of-merit (1=good, 7=bad)
//
// $GETVER 12.0.1 BOOT 10 fbde 7437 06162200B0000A2004183ACC
// $GETVER 12.0.1 0.4850266.0.1 19 fbde 7437 06162200B0000A2004183ACC
// [version information, I used this to know if I need to send the PROCEED command, String contains BOOT when in bootloader mode]
// [During boot, only terminated with LF but not CR(or maybe other-way around?)]
// 1: Bootloader version?
// 2: ("BOOT" during boot) or (software or perhaps GPS version info?)
// 3: Status code (same as $STATUS)
// 4: CRC of something?
// 5: Always 7437?
// 6: (Part number: 06162200)(Board Rev: B)(Assembly version: 0000)(Delimeter: A)(Year: 2004)(Week?: 18)(SN?: 3ACC)
//
// $WSAT 4 138 209 38 0
// [WAAS Satellite info, same format as $SAT]
//
// $SET1PPS
// [Sent at boot, but also in response to a $SET1PPS command. Sent every 20 seconds.]
//
// $KALDBG 1187203779 0.08 29.59241e3 0.120e-3 0.568 0 0
// [Only be sent when reference is locked (state=0)]
// 1: GPS UNIX-timestamp (secs since 1970), but my board is off by 10 years (reporting 2007 while it is 2017)
// 2: Floating point number.
// Resets to 0 at time of lock (and at end of holdover).
// 3: Floating point number. Magnitude is similar to PPS3, but does not track it so well.
// 4: Floating point.
// Resets to 0 at time of lock (and at end of holdover).
// 5: Floating point. Smoothed version of PPS3, seems like ~6.5*(PPS phase in ns)?
// Resets to 0 at time of lock (and at end of holdover).
// 6: Flag, always zero?
// 7: Flag, always zero?
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