Synergy Systems, LLC产品说明书

15 January 2014

Revision L - 16 March 2019

Oncore Receiver - 1024 Week Roll-Over Dates

Except as noted, all receivers were manufactured by Motorola

Disclaimer – This App-Note was originally created on January 15, 2014 in anticipation of the first 8

channel VP Oncore receivers reaching their internal, 1024 week limit later in that year. Subsequent

revisions included additional Motorola Oncore products. During the process of compiling this data, it

became clear that the most accurate way to define a specific receiver’s 1024 week roll-over date, is to

issue the binary @@Cj Receiver ID Command to the specific receiver of interest and observe the

“Software Date.” Add 1024 weeks to that number to derive the roll-over date. In some cases (notes on

last page) even the Software Date returned by the @@Cj Receiver message is not always accurate!

Summary - The following information was partially derived from the original Motorola Firmware Release

App-Notes. If information was not available from Motorola, roll-over dates were determined either by

customer inputs or testing of various Oncore receivers in Synergy’s tech-support lab.

When it is not possible to query the receiver directly, this App-Note is intended to be used as a guide

only for the various Oncore receiver’s roll-over dates. Differences from the listed ”Software Date” in the

tables below, have been noticed for Motorola’s internal customers and house accounts (like iDEN and

OnStar, etc.) and those who purchased Receivers through domestic and international distributors. In

addition, many Oncore receivers have been re-flashed to upgrade receiver features over the years.

Those receivers, usually with the letter “R” placed anywhere in the part number, are not included here.

Motorola’s published App-Notes did not always include VP, GT, GT+, UT, UT+, M12 and M12+ Oncore

firmware “Base Dates” that matched the receiver’s assigned Software Date as shown in the receivers

@@Cj ID message. Firmware dates for the GT+ navigation receivers were not always announced in

Motorola’s firmware update App Notes, so, where available, the dates listed in the table below are from

engineering samples. Because of the above, and some firmware App-Notes not released by Motorola,

this Oncore receiver Week Roll-Over information is presented as guide only.

Note that an Oncore receiver’s 1024 Week Roll-Over date is completely separate from the NavStar GPS

Satellite constellation’s GPS End of Week (EOW) Roll-Over coming on April 6, 2019. A GPS World article

on the first, 1999 GPS EOW is here: /gpsworld/.

Notes for April 6 2019 are here: /cgsic/meetings/2017/ and here:

/sites/default/files/documents/Memorandum_on_GPS_

Motorola either did not test, or did not disseminate test results for distribution, on any of the PVT-6,

Basic, VP, UTUT+, GTGT+ or M12+ receivers for the April 2019 GPS End of Week roll-over.

Details - All Motorola Oncore series GPS receivers, contain an internal, 1024 week counter that is based

on the receiver’s firmware compile date. A receiver’s “Software Date,” as displayed in the receiver’s

@@Cj ID Message, were defined by Motorola’s software engineering staff. The Software Date, starting

on row 6 column 16 of the below Receiver ID matrix, should reflect the firmware’s final compile date

from which a week roll-over date can be calculated but deviations from this standard have been noted.

© Synergy Systems, LLC 2008 - 2019 All rights reserved.

SynPaQ® and Time Proven Products and Support® are registered trademarks of Synergy Systems, LLC

Web: - Email: - Phone: (858) 566-0666 - Fax (858) 566-0768

15 January 2014

Revision L - 16 March 2019

An example of firmware date confusion can be seen with UT+ v3.2. The observed “Software Date” on a

Synergy sample using the @@Cj Receiver ID command, shows 8/23/2000 but Motorola’s “Oncore

Technical Application Note” says the Default year changed to 1/1/2000. Issuing the @@Cj Receiver ID

Command to the specific receiver of interest is the only reliable way to determine the 1024 week roll-

over date. Always believe the receiver being tested!

As stated above, the best method of determining a receiver’s actual 1024-week roll-over date is to use

the @@Cj Receiver ID command and observe the response. Add 1024 weeks to the observed date to

reveal the receiver’s 1024 Week Roll-Over date. A simple to use date Calculator is here:

/date/?m1=8&d1=1&y1=2000&type=add&ay=&am=&aw

=1024&ad=&rec=

OEM receivers later than the PVT-6, Basic Oncore and VP Oncore (i.e. GT+, UT+, M12+) do not have the

capability of permanently setting the base year date (epoch) due to the lack of on-board, non-volatile

flash memory. Review the individual Oncore receiver Firmware Release Notes for details here:

/support/motorola-legacy-products/

An estimated Roll-Over date is used (below) when a publish date andor a physical GPS board sample

was not available to test. Here are the Oncore GPS Receiver Week Roll-Over dates reported by the

Motorola App Note, the @@Cj message, and Synergy or customer Oncore receiver engineering samples:

© Synergy Systems, LLC 2008 - 2019 All rights reserved.

SynPaQ® and Time Proven Products and Support® are registered trademarks of Synergy Systems, LLC

Web: - Email: *********************** - Phone: (858) 566-0666 - Fax (858) 566-0768