RS485 range runs from HV supplies

A Westermo Data Communications product story
Edited by the Engineeringtalk editorial team Oct 27, 2003

To meet continuing demand Westermo has enhanced its range of RS485 DIN rail mounting products by launching high-voltage versions of the RD-48 repeater/isolators and MD45 convertors.

Despite the excitement surrounding fieldbuses and Industrial Ethernet, the tried and tested RS485 standard is the basis for most of the industrial communications systems installed over the last 20 years and still is as popular as ever.

To meet continuing demand Westermo has enhanced its range of RS485 DIN rail mounting products by launching high-voltage versions of the RD-48 repeater/isolators and MD-45 convertors.

Existing RD-48 LV and MD-45 LV (Low voltage) versions are powered typically by 10-55V DC supplies and are intended for general industrial market applications.

The new HV versions work with 95-240V AC and 110-250V DC supplies.

Westermo believes that these HV products, which can be powered directly from high voltage DC sources typically found in the power generation market, are unique.

The RD-48 repeater can be used on both two- and four-wire RS422/485 networks and can also be used to convert between the two.

It now features antiblocking technology so that a fault on the network will be stopped, thus allowing other network segments to continue functioning.

Datarates up to 1.5Mbit/s are possible and with a special retiming function multiple repeaters can be used even on the highest speed networks, where jitter caused by long cables and data passing though ordinary repeaters can often cause communication problems.

The MD-45 HV convertor is a fully functioned RS232 to RS422/485 convertor, capable of automatic data turning.

It features LED indicators to assist with diagnosis of faults.

Like all Westermo products the range features trigalvanic isolation, vital for industrial environments.

The units also have inbuilt transient suppression to limit damage from noise spikes and are designed to function reliably in harsh electromagnetic environments.

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