Document Reference No.: ES_000086

ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual

Version 1.0

Clearance No.: ES

©2010 - 2011 EasySYNC Ltd.

5

3 Features of the ES-R-2x01B-M

The ES-R-2101B-M converter is optically isolated with 2000 Volt DC optical isolation. The optical isolation

protects the PC from spikes and surges on the RS-422/RS-485 network, by converting the electrical pulse

into an optical signal and then changing it back into an electrical pulse. The computer is well protected,

since the surges and spikes cannot cross the optical link.

The ES-R-2101B-M also features surge protectors, to withstand electrostatic discharge and power surges

up to 25KV ESD. The surge suppression on all signals prevents damage caused by lightning or high

voltage.

The ES-R-2001B-M and ES-R-2101B-M accept a wide range of supply voltages, from 9V DC to 48V DC.

The power input connector is a 3–pin terminal-block style connector as shown in Figure 1 below.

An external switch-mode power adapter is supplied with the converter.

Figure 1

9V DC to 48V DC power input connector

The ES-R-2001B-M and ES-R-2101B-M converters have a metal enclosure. Transmit and Receive LEDs

are included to show when data is being transmitted or received on the serial lines. A power LED is also

included to show that the converter is receiving power.

The ES-R-2001B-M and ES-R-2101B-M converters use DIP switches to select RS-422 or RS-485 modes.

They also feature jumpers to set the pinout of the RS-232 port to a DCE or DTE configuration, and to

enable termination and biasing when required.

Please refer to section 4 for more information on the DIP switch and jumper settings available.