Line sharing modem



✔ Create long distance multi-drop RS-232 networks

• RS-232 line splitter functionality
• Line drive up to 18 km (11.18 mi)
• Repeater of Westermo W1 interface

✔ Easy to install and use

• Transparent between all channels
• Purpose built DIN rail casing with integral clip
• D-sub or screw terminal

✔ Designed for use in harsh industrial applications

• AC or DC power options
• Total galvanic isolation & transient protection
• Industrial EMC, shock and vibration approval

✔ Flexible solution for many applications

• Three RS-232 or W1 configurable interfaces
• Bypass relay as option
• Half- and full duplex bus mode (Y/V mode)


The LD-01 is a four port line split modem allowing RS-232 systems to be connected in multidrop applications over long distance. The interface can be ether standard RS-232 or W1, a balanced current loop allowing transmission distances up
to 18 km (11.18 mi). In multidrop applications the LD-01 acts as a repeater on the W1 interface.

DIP switches are used for configuration options which make the unit simple to install. The serial interface is connected through a standard 9 pol D-sub or terminal block with screw connectors.

The LD-01 is designed for use in heavy duty industrial applications. The different power options, galvanic isolation, transient protection guarantees communication in the worst environments. The LD-01 has been tested to meet many EMC, isolation, vibration and shock standards, all to the highest levels suitable for heavy industrial environments.

The design of the line split modem makes the LD-01 suitable for a variety of applications with various speed and data bit options. The V and Y mode emulate half or full duplex communication between master and slaves and a bypass board can be fitted to ensure networks can’t be broken by power failure at a single point.

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Technical Specifications

Line sharing modem
1x 10 mA tri-state balanced current loop up to 38.4 kbit/s
1 x RS-232 up to 38.4 kbit/s

Carl de Bruin

International sales

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