The VESDA® MODBUS HLI (High Level Interface) acts as a proxy for all VESDA devices on the VESDAnet network. It is able to report alarms to the host within seconds. Type 1 and Type 2 can support up to 40 VESDA detectors on a single network, and Type 3 can support up to 100. Type 1 also has an echo feature where it echoes each character received back to the host. The wall-mounted versions come with a metal enclosure for permanent mounting on a flat surface.
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