Reader Power Select Configuration Options For LP4502, LP1502 & MR-52-Series 3 Boards


Overview

The Reader Power Select option on the LP4502 (J7), LP1502 (J7) & Series 3 boards (J1) has been changed.

Impacted Mercury Products
The following table indicates which boards this pertains to and to which revisions this change applies.

Model PCB Revision
(printed on PCB)
Assembly Revision
(white sticker)
LP4502 B C
LP1502 C C
MR-52 S3 B E

Installation Scenarios

  • If 24VDC is applied to a board with pass-through selected: 24VDC will be passed through to reader ports.
  • If 24VDC is applied to a board with 12V selected: 12VDC will be supplied to the reader ports.
  • If 12VDC is applied to a board with pass-through selected: 12VDC will be passed through to reader ports.
  • If 12VDC is applied to a board with 12V selected: 0 VDC will be supplied to the reader ports.
    This is the scenario that changed. Note that while this scenario may have allowed voltage to be supplied to the reader ports on older versions of the boards, this was never the recommended configuration and has always been documented accordingly in Mercury’s installation manuals.

Customer Actions
In cases where there is a field installation of the applicable board(s) or they are being replaced, a customer will have to notify installers, where there is a 12VDC supplied to the board, to change the Reader Power Select jumper to the PT position if it was not already. 

For more information, see the KB article below.

More Information

No Reader Power - LP1502, LP4502, & MR-52-Series 3 Boards


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  • 02-Aug-2019
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