DESCRIPTION:

The Model HM-696 High Voltage Data Line Isolator provides 1000 volts electrical isolation to a serial data line. Isolated serial data lines are required when data lines go to a building, or building section, on a separate utility power feed.

The Isolation eliminates the damaging effects of ground currents during lightning strikes. It protects devices and the console from transients.

The HM-696 allows the data line the same capacity as a standard Sentry serial data line, supporting up to 52 Host Panels, 7 Utility Panels, and one power supply.

The HM-696 will operate with all Sentry panels. It cannot be used with the HM-676 Remote Display Stations.

The isolator can be placed on the data line between the data port and devices on the data line.

More than one isolator can be used on one data line. In cases where data lines are greater than 1 mile, the HM-696 will also provide a signal boost to the data signal traveling in both directions.

The HM-696 is powered by the standard 12 volts DC supplied to all Sentry devices. The voltage source can come from supplies on either the input or output side of the HM-696. A separate power supply is not necessary, since the HM-696 includes isolated internal supplies. It is important to assure the DC supply has battery back-up for data transfer during power outages.

The HM-696 Data Line Isolator is typically mounted using the Model HM-595 Plastic PCB track and depending on the number used, enclosed in a Model HM-720 or Model HM-722 Enclosure. Screw terminals are provided for all field wiring.