Dear Valued Customer,

We are contacting you today to notify you that we have completed an Improvement to the TS-TPC-8390 for UL Support . Technologic Systems strives to produce products that are ready for UL certification within our customer's end product deployments.  It was determined that a minor improvement in the RTC battery circuit could allow the TS-TPC-8390 products to be ready for use in UL certified product.  This board revision has no impact on the form, fit, or function of hardware or software solutions with the TS-TPC-8390.

The affected products are: TS-TPC-8390, TS-TPC-8390-4700, TS-TPC-8390-4710, TS-TPC-8390-4800, TS-TPC-8390-4900

On all deliveries of the TS-TPC-8390 starting immediately the hardware revision will be Rev E, indicating that the RTC circuit has a diode required by UL.  This change has been fully tested and has no impact on any other TS-TPC-8390 applications.  No other changes were implemented during this board revision.

Technologic Systems appreciates your business. If you have further questions or concerns, please contact us by either replying to this email or filling out the contact us form at

Best Regards,

Technologic Systems
16525 East Laser Drive
Fountain Hills, AZ 85268
Phone: (480) 837-5200
Fax: (480) 837-5300