Mercury Hardware Tips and Tricks

Version: 1.0 | Created: November 2024

Hardware settings and wiring tips for Mercury LP1501, LP1502 and MR52 boards used with QxControl.

LP1502

• Remove the paper sticker from the battery and set jumper J19 to ON.
• All DIP switches should be in the Off position.

LP1501

• Has an integrated battery, so there is no J19.
• Has a 4-position DIP switch block, which comes all On by default. After the IP is set, all 4 must be Off for normal operation.
• J3 must be set for PoE or 12 VDC operation.
• DIP switch 4 should never be On for Qumulex. It converts the board to a legacy device (EP1501), which is not compatible with QxControl.
• If the IP is already programmed and you need to reach the webpage, DIP switch 1 enables the factory username and password. To also revert the board to its default IP, set switches 1 and 2 to On. Switches 3 and 4 are always Off.
• TB2 can be used either as a reader port (LP1501 Reader support mode) or for an SIO board, when LP1501 Serial Support is selected as the device type in QxControl.
• Serial Support wiring: TB2-4 is Data 1 / TR+, TB2-5 is Data 0 / TR-, TB2-6 is GND.

MR52 / LP1501 Reader Wiring (Reader Support mode)

MR52

• Use 3 wires for the data connection, including the ground. The ground is required.
• The board address is set in binary on the first DIP switches: Address 1 = switch 1 On; Address 2 = switch 2 On; Address 3 = switches 1 and 2 On.
• DIP switches 6, 7 and 8 must be On for QxControl. This sets serial communication to 38,400 BPS with encryption on.
• Make sure the last serial device in the communication chain is terminated. The very last board may need jumper J4 for termination, though this is rarely needed.
• LED B goes solid when connected. If something isn't right, it slow-flashes about every 3 seconds.
• The board may need a reboot once it's connected and the DIP switches are set.
• If communication polarity is reversed anywhere, it can stop communication for the entire chain.
• When everything is working, LED B flashes rapidly when you scan a badge. This is a good way to confirm which board a reader is landed on.
• All controller connection statuses are shown under Wiring Info on the device page in QxControl.

Example DIP Switch Assignments and Pinout

This example shows an MR52 addressed as board 1, with two doors terminated to it. It assumes a door position switch (DPS), REX and reader at each door, with outputs landing on the LSP C4/C8 lock modules.

MR52 Address 1 (DIP switch 1 On)

Need help?

Contact Qumulex Support at support@qumulex.com or 317-207-0520.

Related articles

• LP1501/02 Connection Troubleshooting
• QXEP-LP1501 I/O Example Wiring
• Mercury Panel Initialization