GST DI-M9300 Addressable Digital Single Input Module (UL Listed)

Description

The GST DI-M9300 Addressable Digital Single Input Module is a high-reliability, loop-powered monitor interface engineered by GST (Carrier) to integrate third-party dry contact equipment into addressable fire alarm systems.

Operating on advanced analog-to-digital (AD) sampling circuitry, the GST DI-M9300 monitors external plant devices such as sprinkler waterflow indicators, pressure switches, gas suppression release signals, and fire door limit contacts.

Certified in strict compliance with the American UL 864 standard and NFPA 72 codes, the GST DI-M9300 provides continuous cable supervision to detect open and short circuits along the monitoring line.

Technical Specifications Table

Supervised Dry Contact Monitoring & Microprocessor Logic in GST DI-M9300

The core electronic advantage of the GST DI-M9300 is its integrated analog-to-digital (AD) sampling circuitry.

Rather than relying on basic continuity loops, the onboard microprocessor continuously measures input circuit resistance across its terminal block.

When terminated with a 4.7 kΩ end-of-line resistor, the GST DI-M9300 accurately distinguishes between an active alarm condition, an open-circuit wire break, and an accidental short circuit, communicating instantaneous status updates to the central panel.

System configurability is built directly into the GST DI-M9300 module architecture.

While factory defaulted to monitor Normally-Open (N/O) contacts, field technicians can easily reconfigure the module to supervise Normally-Closed (N/C) dry contacts using the GST P-9910B handheld programmer.

This allows smooth integration with specialized security sensors, clean agent release pressure switches, and industrial interlocks without requiring external relay adapters.

Installation workflows are simplified through versatile mounting options and low current consumption.

The compact form factor snaps directly onto standard 35mm DIN-rails inside distribution cabinets or mounts to flat surfaces using screw mounting holes.

With an ultra-low standby current of just 0.26 mA, system designers can connect numerous GST DI-M9300 modules along a single signaling line circuit without risking excessive line voltage drop.

• Continuous Cable Supervision: Built-in AD sampling tracks line resistance to immediately report wire breaks or line short faults.
• Selectable Contact Logic: Easily configured for Normally-Open or Normally-Closed dry contacts via handheld programming tools.
• Dual LED Visual Status: Features dedicated red activation and yellow fault LEDs for straightforward local troubleshooting.
• DIN-Rail & Surface Mounting: Compact chassis fits onto standard 35mm DIN rails or into multi-unit module enclosures.

Frequently Asked Questions (FAQ)

Q1: What types of equipment can be monitored by the GST DI-M9300 input module?
A: The GST DI-M9300 monitors any dry-contact output device, including sprinkler waterflow switches, pressure switches, post indicator valves (PIVs), fire damper limit switches, and auxiliary panel alarm contacts.

Q2: Does the GST DI-M9300 require an external 24V power supply to operate?
A: No. The GST DI-M9300 is fully loop-powered, drawing minimal current (≤ 0.26 mA standby) directly from the 2-wire signaling line circuit (SLC).

Q3: How is the loop address set on the GST DI-M9300 module?
A: The address (from 1 to 242) and contact mode (N/O or N/C) are configured electronically using the GST P-9910B handheld programmer, avoiding physical DIP switches.

Q4: What end-of-line resistor value is required for supervising the input circuit?
A: The input circuit requires a 4.7 kΩ end-of-line resistor connected across the final field contact to enable cable supervision.

Q5: What do the LED indicators on the front of the GST DI-M9300 signify?
A: The red Feedback LED illuminates steadily during an alarm activation and flashes in normal polling, while the yellow Fault LED flashes if an input wiring fault (open or short circuit) is detected.

Q6: Can multiple GST DI-M9300 modules be mounted inside a single control cabinet?
A: Yes. The GST DI-M9300 features integrated DIN-rail clips designed for standard 35mm rails, allowing high-density side-by-side mounting inside electrical cabinets or modular multi-box enclosures.