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8 Zone V-Plex Expander
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The 4208EX is an eight-zone expander that allows the use of available expansion zones on Honeywell Home VISTA controls that support V-Plex® polling loop devices. This V-Plex Expander is ULC Listed for high security burglary and fire monitoring applications.


  • Can be used on controls that support V-Plex
  • Can be optionally powered from an external DC power supply to reduce the amount of current draw from the polling loop
  • Uniquely identified eight EOLR supervised zones
  • Each zone is identified by a unique serial number, which is assigned via on-board DIP switches
  • Detects faults on all zones within 400ms of occurence
  • Loops A & B can be programmed for fast (10ms) response
  • Provides cover tamper protection, which may be enabled or disabled via onboard DIP switches