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Controller Hardware Configuration


This article will cover how to configure the Mercury controllers for a Access Control System. 

For more information please refer to the complete documentation, found here: EP1502, EP1501, EP2500, MR52 , MR16in and MR16out


  1. First , mount boards and power supply in cabinet or in there final location. 
  2. Wire Power from power supply to power on EP1502, MR52, MR16in. Be sure to only provide one Earth Ground for the System to avoid ground loop problems.
    • Black wire to Ground
    • Red wire to Power (V IN)


  1. On the EP1502 configure the Tamper and UPS monitoring, with a closed condition. If Tamper and UPS monitoring are not going to be used install a jumper wire here to close the circuit.
  2.  Ensure that the EP1502 is set to 12V , if not set the jumper at J7 to the rightmost two pins. (The standard orientation is with the battery at the top.) 
    • Note: Setting the jumper to PT(pass through) can seriously damage equipment, please consult card reader specifications to ensure that the card reader or other device can handle the power being supplied.
    • Note:  If using the PT feature you must ensure that at least 20Vdc is being supplied to the board.
  3. Wire RS485
    • ​Note: We will always use the White wire in TR+ and the Green Wire on TR- 
    • ​​Note: The MR52, MR16IN and MR16OUT will only support 2 wire configurations and require the jumper be placed on 2W at  the J3 jumper
    • For EP1502 RS485 points are at TB3 (SIO Port for 2-wire RS-485) on the board
      • ​Note: Communication begins at the EP1502 and daisy chains to the other boards using a MUX8 as necessary.
    • MR52 (TB6- SIO Port for 2-wire RS-485) Board also says RS485​
    • MR16IN (TB10) Board also says RS485 
    • MR16OUT (TB10) Board also says RS485 


ep1502comm.png             mr52comm.png           mr16comm.png  


  1. Next, we will disable termination of the RS485 signal. This is our recommended configuration for more details please consult the full documentation for each of the devices.
    • On the EP1502 and MR 52, the jumper should be unset at J5.
    • On the MR16IN and MR16OUT the jumpers at J1 should be unset.
  2. Next, we will configure the MR 52s and MR 16s
    • Each board will have eight dip switches. The first five switched S1-S5 are used for setting the address of the device and the last three, S6-S8 are used for determining the baud rate.
    • We must address all of the boards connected to the system in series. The address switches work on a binary number system, for example if S1 and S2 are on it represents address 3. View Chart Plus Sign.png.
      • Note: is important to never assign a board address 0 as this is reserved for the EP1502.


  1. Next, we will set the baud rate. For all BluSKY configurations we will use a baud rate of 38400, which is configured with dip switches S6 and S7 in an on position.
  1. When finished, see the  Network Configuration for the EP1502 guide to complete the hardware's network configuration.
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