Key Features

  • Provides two interfaces to NC/NO contact devices
  • Address settable from 001 to 254 by a dedicated programmer
  • Loop powered and low standby current (3mA)
  • Single loop address
  • Supports Class A and Class B wiring


The Velocity Addressable Dual Input Module is intended for use with addressable two wire systems. The Velocity Addressable Dual Input Module monitors and transmits the status (normal, open, short or active) of devices equipped with NC/NO dry contacts such as pull stations, water flow switches and security catches to a control panel. The initiating device circuit (IDC) can be wired as Class A (Style D & E) or Class B (Style B & C).

It has a built-in short-circuit isolator (SCI) to prevent loop failure in the event of a short on the loop.

The Velocity Addressable Dual Input Module is loop powered and can be mounted directly onto a 4-inch electrical box. It has three coloured LEDs to indicate the status of the input, polling and SCI.


All components in the Velocity range are UL certified and comply with the requirements of Underwriters Laboratories (UL) 864 Control Units and Accessories for Fire Alarm Systems 10th Edition.

Tech Specs

SLC Applied VoltageRated Range 20 to 38 VDC
SLC Current ConsumptionStandby 3.0mA
Activated 16.9 mA (max)
SLC Line ImpedanceUp to 50Ω
Number of IDC (Initiating Device Circuit)1 x Class A or 2 x Class B
IDC Circuit Rating15 V DC, 2.2 kΩ, 6.8mA (max)
IDC Line ImpedanceUp to 50Ω
EOL DeviceRE-10 k (10 kΩ, 1/4 W) (included)
2.2 kΩ resistance required for each dry contact switch in subtype setting 7, 8, 9 and 10
SCI on Resistance0.2 ohms (max)
SCI Fault Detection Threshold10V (min)
SCI Isolation Current22mA (max)
Visual Indicator (Status LED) Polling LED (GREEN)
Input LED (RED)
Ambient Installation Temperature0°C to 49°C (32°F to 120°F)
Storage Temperature-20°C to 60°C (-4°F to 140°F)
Max Relative HumidityUp to 93% RH, non-condensing
EnvironmentIndoor dry use only
Max Quantity Per Loop127 Units
TerminalScrew AWG 12 to 22
Address SettingVDOT-AD2 Address Programmer
Dimensions (W x H x D)124mm x 124mm x 34.5mm
WeightApproximately 154g




Velocity Addressable Dual Input Module with Short Circuit Isolator

Contact Us