Mercury
Mercury access control panels — installation guides, DIP switch settings, and wiring references for MP1501, MP1502, and MR52. Includes the Mercury Installation Assistant Utility (IAU) download.

MP1501 — Single Door Panel
Overview The Mercury MP1501 is a single-door access control panel. It supports 1 door with 2 readers (in/out), 8 supervised inputs, and 4 relay outputs. Connects to a host controller (EP1502, EP2500, etc.) via RS-485. Spec Value Doors 1 Readers 2 (Wiegand or OSDP) Inputs 8 supervised Outputs 4 relay Communication RS-485 to host controller Power Input 12–24VDC DIP Switches The MP1501 has an 8-position DIP switch bank used to set the RS-485 board address. The address determines which port on the host controller this panel communicates on. Address SW1 SW2 SW3 SW4 SW5–8 0 OFF OFF OFF OFF OFF 1 ON OFF OFF OFF OFF 2 OFF ON OFF OFF OFF 3 ON ON OFF OFF OFF 4 OFF OFF ON OFF OFF 5 ON OFF ON OFF OFF 6 OFF ON ON OFF OFF 7 ON ON ON OFF OFF SW5–SW8: Reserved — leave OFF. Address 0 is typically not used in production (reserved for default/unconfigured). Wiring Notes RS-485 Bus: Connect A(+) and B(−) to the RS-485 port on the host controller. Daisy-chain up to 32 devices per RS-485 segment. Terminate the last device with a 120Ω resistor. Readers: Reader 1 = Door IN, Reader 2 = Door OUT. Wiegand: D0/D1/+5V/GND. OSDP: A/B/+12V/GND. Door strike: Connect to Relay 1 (NC/COM/NO). Use NC for fail-safe (unlocks on power loss) or NO for fail-secure. Door contact: Connect to Input 1 (supervised — use EOL resistors per system requirements). Rex (Request to Exit): Connect to Input 2. Resources MP1501 Installation Guide (HID/Mercury) Mercury Installation Assistant Utility (IAU)

MP1502 — Dual Door Panel
Overview The Mercury MP1502 is a two-door access control panel. It supports 2 doors with up to 4 readers (2 in/2 out), 16 supervised inputs, and 8 relay outputs. Connects to a host controller via RS-485. Spec Value Doors 2 Readers 4 (Wiegand or OSDP) Inputs 16 supervised Outputs 8 relay Communication RS-485 to host controller Power Input 12–24VDC DIP Switches The MP1502 uses an 8-position DIP switch bank to set the RS-485 board address (binary encoded, SW1=LSB). Address SW1 SW2 SW3 SW4 SW5–8 0 OFF OFF OFF OFF OFF 1 ON OFF OFF OFF OFF 2 OFF ON OFF OFF OFF 3 ON ON OFF OFF OFF 4 OFF OFF ON OFF OFF 5 ON OFF ON OFF OFF 6 OFF ON ON OFF OFF 7 ON ON ON OFF OFF SW5–SW8: Reserved — leave OFF. Wiring Notes RS-485 Bus: A(+) and B(−) to host controller RS-485 port. Daisy-chain up to 32 devices. Terminate last device with 120Ω. Door 1 readers: R1 (IN) and R2 (OUT). Door 2 readers: R3 (IN) and R4 (OUT). Door strikes: Relay 1 = Door 1, Relay 2 = Door 2. Relay 3–8 available for auxiliary outputs. Door contacts: Input 1 = Door 1 position, Input 2 = Door 2 position (use supervised EOL resistors). Rex inputs: Input 3 = Door 1 Rex, Input 4 = Door 2 Rex. Resources MP1502 Installation Guide (HID/Mercury) Mercury Installation Assistant Utility (IAU)

MR52 — Downstream Reader Interface
Overview The Mercury MR52 is a downstream reader interface module used to expand a Mercury panel with additional reader ports. It adds 2 readers and 4 supervised inputs per module. Typically used with an EP1502 or similar host controller to support additional doors without a full second panel. Spec Value Readers 2 (Wiegand or OSDP) Inputs 4 supervised Outputs 2 relay Communication RS-485 downstream from host panel Power Input 12VDC from host or separate supply DIP Switches The MR52 uses DIP switches to set its downstream RS-485 address relative to the host panel. Multiple MR52 modules can be chained from a single host. Address SW1 SW2 SW3 SW4 1 ON OFF OFF OFF 2 OFF ON OFF OFF 3 ON ON OFF OFF 4 OFF OFF ON OFF 5 ON OFF ON OFF 6 OFF ON ON OFF 7 ON ON ON OFF Address 0 (all OFF) is not valid — each MR52 must have a unique address. SW5–SW8: Reserved — leave OFF. Wiring Notes Downstream RS-485: Connect the MR52 A(+)/B(−) to the downstream RS-485 port on the host Mercury panel (not the upstream network port). This is a separate bus from the host-to-controller RS-485. Termination: Place a 120Ω termination resistor on the last MR52 in the chain. Power: 12VDC — can share the host panel power supply if within budget, or use dedicated 12V supply for longer runs. Readers: R1 and R2 — connect same as a standard Mercury panel reader port (Wiegand or OSDP). Inputs: 4 supervised inputs — typically used for door contact (Input 1) and Rex (Input 2) for each reader, plus auxiliary inputs. Common Use Cases Adding a second reader to a door (exit reader) where the host panel reader port is already used Expanding a single-door panel to handle additional monitoring points without adding a full panel Connecting readers in a remote location (elevator lobby, parking gate) with a longer RS-485 run Resources MR52 Installation Guide (HID/Mercury) Mercury Installation Assistant Utility (IAU)