Although many industrial networks run on Ethernet, there are huge volumes of serial based devices being implemented in the industrial field globally. These include such protocols as Modbus, DNP3 and Profibus. These devices need communicate with one another, as well as interface to new Ethernet based applications.


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Despite the dominance of Ethernet in modern industrial networks there is still a vast installed base of legacy serial equipment that is still in use.

Whether it is RS-232, RS-422/485, PROFIBUS, M-bus or even 20mA current loop, Westermo still offers a range of solutions.

RS-232, Point-to-point

The MD-12 is used in point-to-point applications or as a start and end modem in a multidrop installation with products using W1 technology.

Westermo’s ±10 mA balanced current loop (W1) transmission technique makes it possible to transmit data up to 18 km (11.2mi) at low data rates on a 4-wire cable. At shorter ranges transmission rates up to 38.4 kbit/s can be achieved.

RS-232, Repeater/Isolator

This unit are used to extend distances or to provide galvanic isolation between different equipment in installations where ground potentials may cause problems. The MD-52 is used together with RS-232 equipment and the RD-48 with RS-422/485.

RS-232, Multidrop

Westermo’s ±10 mA balanced current loop (W1) transmission technique makes it possible to transmit data up to 18 km (11.2 mi) at low data rates on a 4-wire cable. At shorter ranges transmission rates up to 38.4 kbit/s can be achieved.

The LD-01 is also available in a ”by-pass” version. This model ensures that if a modem in the multidrop network should fail that modem will be by-passed, hence not effecting the communications between other units on the network.

RS-422/485, Repeater/Isolator

According to the standard the RS-422/485 interface is able to support a total of 32 connected devices and a transmission range of up to 1200 meters (4000 ft).

A repeater can be used to extend the range by an extra 1200 metres or to add another 32 connected devices. Up to 8 repeaters can be used in a single network.

The RD-48 can also allow star networks to be created, provide galvanic isolation between segments and correct termination of the line.

When you need to extend RS-232 beyond the 15m limit

The Westermo range of industrial short haul modems ensures your serial RS-232 communications remain reliable up to 18 km / 11 miles. Our short haul modems act as point to point RS-232 line drivers and are designed to operate in harsh environments. Total galvanic isolation, transient protection and industrial level EMC immunity are standard features in Westermo modems in order to provide a rugged, robust solution for the most unforgiving environments.

Multidrop modems for industrial automation

For applications where several serial RS-232, RS-422 or RS-485 devices need to be connected together over large distances, the Westermo range of industrial multidrop modems ensure reliable communications in the harshest environments. Our multidrop modems act as transparent line sharers, where a master device needs to communicate with a number of slaves, for example, data being collected from a number of substations and then transmitted back to a SCADA.

Industrial converters for industrial protocols

Westermo can supply a range of converters / repeaters to suit a whole host of industrial protocols and communication methods, including Ethernet, RS-232, RS-422, RS-485, PROFIBUS DP, M-Bus and 20mA current loop. Whether you need a fibre media converter for an Ethernet link, a serial converter, or a repeater for an RS-485 network, you can rest assure that Westermo have a solution which will operate in the harshest industrial environments and provide robust, reliable communications for peace of mind.

Converting or repeating serial data is made easy by Westermo

Westermo manufacture an extensive range of industrial serial converters and repeaters. Whether you wish to convert between Ethernet, RS-232 and RS-422 or RS-485, extend a serial network, provide a gateway between Modbus RTU or ASCII and Modbus TCP, convert between 2-wire and 4-wire applications, or even provide isolation between serial devices, Westermo has a solution. Our industrial serial converters / repeaters are designed for use in harsh environments and ensure rugged, reliable communications.

PROFIBUS DP and M-Bus converters for serial applications

For applications where there is a requirement to connect serial RS-232 or RS-485 devices into M-Bus or PROFIBUS DP networks, Westermo have a range of industrial protocol converters. Whether you need to convert RS-232 / RS-485 to M-Bus or PROFIBUS DP, extend M-Bus connections, or extend PROFIBUS DP networks over PSTN dial up connections, leased lines / private wires or radio, the Westermo range of industrial converters ensure reliable communications in the harshest environments.

Integrating serial data with 20mA current loop

The Westermo range of industrial current loop converters provides a solution for point to point applications where RS-232 data needs transmitting over 20mA current loop. Our current loop converters can be set to either active or passive on both the transmitter and receiver and allow transmission up to 6km. Designed for use in harsh environments, the Westermo RS-232 to 20mA current loop converters ensure communications over long distances and in environments with high levels of interference.