Elk ELK-M1XIN M1 16 Zone Input Expander

The ELK M1XIN is a 16-zone hardwired input expander designed to increase the number of supervised security zones on compatible ELK M1 Gold and M1EZ8 control panels. Featuring 16 end-of-line (EOL) resistor-supervised inputs, four-wire RS-485 data bus communication, and configurable DIP switch addressing, the module supports expansion of existing intrusion detection systems. Up to 12 M1XIN expanders can be connected to an M1 system, supporting up to 208 total zones on the M1 Gold. The module operates at 9-14 VDC, draws 65 mA, and includes mounting glides and 2,200-ohm EOL resistors.

ELK M1XIN 16-Zone Hardwired Input Expander for M1 Security Control Panels

The ELK M1XIN 16-Zone Input Expander adds 16 individually identifiable hardwired security zones to compatible ELK M1 Gold and M1EZ8 control panels. Designed for residential and commercial intrusion detection systems, the module connects additional wired security devices, including door contacts, window contacts, motion detectors, and other compatible dry-contact sensors, to the existing M1 control system. Each input supports end-of-line resistor supervision, allowing the control panel to monitor circuit conditions and identify changes in connected detection devices. The M1XIN communicates through the control panel's four-wire RS-485 data bus, eliminating the need for individual zone wiring to terminate directly at the main control board. Up to 12 expansion modules can be installed, providing 192 additional hardwired inputs and increasing the M1 Gold system capacity to 208 zones.

The M1XIN operates on 9-14 VDC with a nominal current draw of 65 mA and measures 6 inches long, 3.25 inches wide, and 0.75 inches high. Its 16 supervised input connections use removable plug-in terminal strips with elevator-style wire clamps and screws for secure field wiring. The module supports 2,200-ohm end-of-line resistors for supervised zone circuits and includes a status and diagnostic LED for monitoring module communication. Four onboard DIP switches establish the module's data bus address, assigning each expander a corresponding bank of 16 zone numbers. The factory-default address is 2, which assigns zones 17 through 32. An onboard 120-ohm data bus termination resistor, enabled through jumper JP1, supports proper RS-485 bus termination when the module is installed at the end of a communication branch.

Designed for security system expansion, building automation integration, and distributed hardwired sensor monitoring, the ELK M1XIN can be mounted inside the main ELK M1 control enclosure or in compatible remote metal cabinets. A single expander fits inside the M1 enclosure using the supplied ELK-SWG circuit board mounting glides. Additional modules can be installed in ELK-SWB14 or ELK-SWB28 enclosures to accommodate larger security systems. Because the expander communicates over the M1 data bus, installers can position modules closer to groups of wired sensors, reducing the need to route every individual detection circuit back to the primary control cabinet. Compatible ELK M1DBH data bus hubs support organized wiring configurations while maintaining the required RS-485 communication topology and termination.

The ELK M1XIN supports installer-configurable zone assignments and automatic bus module enrollment through the compatible ELK M1 control panel's programming interface. After setting the DIP switch address and connecting the four-wire data bus, installers enroll the expander using the control panel's Bus Module Enrollment function and configure the additional inputs through Zone Definitions. The module includes 18 ELK-ER2200 2,200-ohm resistors and two ELK-SWG mounting glides, providing the primary hardware required for supervised zone wiring and cabinet installation. Its diagnostic LED assists with communication verification, while the removable terminal connectors simplify wiring and maintenance. As part of the ELK M1 security and automation platform, the M1XIN provides expandable hardwired detection capacity without replacing an existing compatible control panel.