The Model 4683-TTM-3F RS-485 network repeater from Acromag is designed for use with Johnson Controls N2 or BACnet MS/TP bus control systems. The device drives up to 32 RS-485 devices and isolates and boosts signals up to 4,000 feet. Electrical surge protection with 1,500-volt AC isolation shields the host computer from destructive noise spikes and other transient signals. The product has multiple LEDs and field-selectable EOLN terminations. The device is available in 24-, 115- and 230-volt AC power models.