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Ajax security hubs

A Crestron Home security-system driver for Ajax alarm hubs. The hub reports to the driver over SIA DC-09 on the local network, with no Ajax cloud and no Ajax account at run time. Arm, night and disarm commands pulse LAN relays wired to Ajax KeyArm inputs.

What it does

  • Acts as a local SIA DC-09 receiver over TCP for the hub, clear or AES-128 encrypted, on port 9550 by default.
  • Creates Crestron Home areas from Ajax groups and zones from Ajax device numbers 1 to 200.
  • Shows each area Armed Away, Armed Stay (Ajax Night mode) or Disarmed, taken only from the hub's events. It never guesses.
  • Arm Away, Arm Stay and Disarm from Crestron Home, each a relay pulse to an Ajax KeyArm input, confirmed when the matching event arrives.
  • Zone states: Ok, Faulted, Tamper, Low Battery, Missing and Bypassed. Area alarms: Burglary, Fire, Medical and Alarm.
  • Hub troubles as system errors: low battery, missing battery, no AC power, loss of communication.
  • Monitor-only operation when no relay outputs are set up.
  • Can run alongside a monitoring company on the Ajax cloud.

Devices and protocols

  • Ajax hubs on OS Malevich 2.7 or later
  • SIA DC-09 over TCP, clear or AES-128. No UDP
  • Ajax KeyArm inputs on a Transmitter or MultiTransmitter (OS Malevich 2.17 or later; not on the original Hub 2G/4G Jeweller)
  • Global Cache iTach IP2CC, GC-100 and Flex relays; Shelly Gen1 and Gen2+ relays

Requirements

  • A Crestron Home processor.
  • An Ajax hub on the same LAN, with its monitoring station (SIA DC-09) connection set to the processor.
  • To arm and disarm from Crestron Home: an Ajax Transmitter or MultiTransmitter with KeyArm inputs, and a Global Cache or Shelly LAN relay wired to them. The driver cannot use the processor's own relays.
  • Hub firmware OS Malevich 2.7 or later for SIA, 2.17 or later for KeyArm.
  • In Setup: the SIA account number, encryption key, groups, zones, outputs, disarm code and options.

Limits to know before you install

  • Not yet tested on a real Ajax hub or a Crestron processor.
  • A disarmed detector sends nothing when opened, so Crestron Home cannot show "door open" while disarmed. Chime events are not sent.
  • The hub sends no state when it connects: the arm state is learned from the next arm or disarm event.
  • Battery level, temperature and signal strength are not reported.
  • Not in this version: bypass commands, alarm restore, siren mute, event log, Ajax cloud mode.
  • Without the KeyArm hardware and a LAN relay, the driver is monitor-only.
  • The encryption key and the disarm code show in clear in Crestron Home Setup.
  • The hub's direct monitoring-station slot serves one receiver.