Acromag’s RS-485 network repeater device allows users to take full advantage of the RS-485 standard’s extended communication distances and multi-dropping capabilities. In addition, these devices offer field selectable End-of-Line Network (EOLN) terminations on both the A and B networks. Operation is transparent to all devices and no handshaking is required. Up to thirtytwo RS-485 devices can be driven. Network repeaters are ready to mount on any base plate. Or, for a harsh environment, it can be installed in a NEMA enclosure of your choice. No enclosure is necessary for use in a laboratory or office. Installation requires mounting, connecting power and cables, and setting the baud rate.Model 4683-TTM-xF network repeaters isolate and boost RS-485 signals allowing communication signals to travel another 4000 ft. Each repeater permits the addition of another 32 unit load to a network. The repeater has two RS-485 “sides” known as the A and B sides. The A side typically connects to the network towards the host and the B side connects to the extended network. Functionally, the A and B sides are equivalent.

Key Features & Benefits
■ Designed for use with Johnson Controls N2 or BACnet bus
■ No handshaking
■ No extra control lines
■ I/O signal isolation
■ Baud rates of 600, 1200, 2400, 4800, 9600, 19.2K, 38.4K, and 76.8K are switch selectable
■ Field-selectable end-of-line network terminations on both A and B sides
■ Electrical transient protection is provided. This protects the host computer from destructive noise spikes and other transient signals.
■ Status LED’s indicate transmission direction, RS-485 bus fault conditions, and power applied.
■ 24/115/230V AC power available
■ No separate transformer required with 24V AC units (4683-TTM-3F)