Network Cards & Modules
VESDA Open Protocol Master-Slave HLI™
VESDA Open Protocol HLI Master Slave model, the host supervises the communications link between itself and the HLI (slave) by regularly polling the HLI to determine whether there has been a change in the status of a detector on VESDAnet.
VESDA Open Protocol High Level Interface (HLI) links VESDAnet1 with PC software monitoring tools, Building Management Systems (BMSs) and Fire Alarm Control Panels (FACPs), otherwise known as ‘host’.
In the master-slave model, the host supervises the communications link between itself and the HLI (slave) by regularly polling the HLI to determine whether there has been a change in the status of a detector on VESDAnet. In response to polling by the host, the HLI generates a single response which is sent back to the host. In this way, no unsolicited messages are sent from the HLI to the host. Depending on the polling strategy adopted, the Master/ Slave Open Protocol HLI is able to report any and all fire alarms within a few seconds of a detector going into alarm. Exact performance is dependent on the polling strategy adopted.Features & Benefits:
- Direct access and monitoring of your VESDAnet system
- Seamless data transfer
- Easily configured using Xtralis configuring and monitoring software packages
- VESDA HLIs are recommended for monitoring only. They are not approved for use as a primary reporting device
- Port Types
- Port Types
- Port Types : RS-232|RS-485