RDL RUSC2 Specifications

RACK-UP® SERIES

Model RU-SC2
Serial Converter

ANYWHERE YOU NEED...

• Conversion From RS-232 to RS-422

• Full-Duplex Communication

• Serial Data Up To 4000 Feet

• Simultaneous Transmit/Receive

• Rack-Mountable Convenience

You Need The RU-SC2!

The RU-SC2 is part of the group of versatile RACK-UP products from Radio Design Labs. The RACK-UP
series features the advanced circuitry for which RDL products are known, combined with accessible, user­friendly controls and displays. The ultra-compact design permits high-density installations, with three
products mounted in a single rack unit! Single RACK-UPs can be mounted right where they are needed
using the adhesive methods popularized by RDL’s STICK-ON series of products. Optional brackets
permit mounting a RACK-UP module above, below, or in front of any flat surface. Optional rack-mount
adapters (RU-RA3, RC-1U) are available for conventional RACK-UP series installation.

APPLICATION: The RU-SC2 is the ideal choice in installations when two RS-232 devices requiring full­duplex communication are to be connected at a long distance. Connection to the RS-232 device is made
on the front panel. The RS-422 input and output connections and power connections are made on the
rear panel through clearly identified, full-size barrier block terminals. When used with the optional
RU-FP1, the RS-232 jack is accessible from the rear of the rack.

Two RU-SC2s may be connected (using the RS-422 connections) over a long distance using balanced,
twisted-pair line to permit feeding data between two RS-232 ports. This allows serial communications over
much greater distances than with conventional RS-232 serial cables.

The RU-SC2 converts both the RS-232 transmit and receive lines to RS-422 balanced, differential format.
A separate balanced connection pair is provided for TRANSMIT and RECEIVE. Each converter in the
RU-SC2 operates independently permitting transmit and receive data to be exchanged simultaneously.

Since communication can flow in both directions at the same time, there is no need for baud rate jumpers.
The RU-SC2 operates at the speed of the data presented via the RS-232 connection. Separate front
panel LEDs are provided to indicate when data is being transmitted and received.

The RU-SC2s are intended to be operated in pairs, extending the distance between two RS-232 devices.
Two balanced pairs are required to interconnect the RU-SC2s. In applications requiring multiple users on
a single pair, refer to the RU-SC1A RS-485 half-duplex interface.

The RU-SC2 is the ideal choice wherever serial protocol conversion or serial data transmission over
extended distances is required. Use the RU-SC2 individually, or combine it with other RDL RACK-UP or
STICK-ON products as part of a complete system.

RDL •• P.O. Box 1286 •• Carpinteria, CA., USA 93014 •• [phone] •• FAX [phone] •• http://www.rdlnet.com

RACK-UP® SERIES

Model RU-SC2
Serial Converter

DSRDTR

JUMPER THESE TERMINALS

IF DSR/DTR IS REQUIRED

BY SOFTWARE

SET OF BALANCED PAIR

DTE

RS - 422

TERMINAL

FULL DUPLEX

RS232

RS-422

TRANSMIT

RECEIVE

Installation/Operation

EN55103-1 E1-E5; EN55103-2 E1-E4

Typical Performance reflects product at publication time
exclusive of EMC data, if any, supplied with product.
Specifications are subject to change without notice.

RECEIVETRANSMIT

24VDC POWER

RS - 422

FULL DUPLEX

24 VDC

POWER

SOURCE

SERIAL CABLE

STRAIGHT THROUGH

TRANSMIT

RS232

RECEIVE

RS-422 24VDC POWER

RECEIVETRANSMIT

DTE

TERMINAL

OR

TO P.C.

SERIAL PORT

(TYPICALLY COM 1)

SERIAL CABLE

STRAIGHT THROUGH

SERIAL CABLE

NULL-MODEM

RS-232 EQUIPMENT

DCE

A PAIR OF RU-SC2s

SET OF BALANCED PAIR

WILL ACT AS A NULL
MODEM. USING A
NULL MODEM CABLE

DTE

TERMINAL

RS - 422

FULL DUPLEX

TRANSMIT

RS232

RECEIVE

WILL CAUSE THE
SYSTEM TO ACT AS
THOUGH THERE IS A
STRAIGHT THROUGH
CONNECTION.

TO P.C.

SERIAL PORT

(TYPICALLY COM 1)

SERIAL CABLE

STRAIGHT THROUGH

TYPICAL PERFORMANCE

Input/Output (bi-directional): RS-232 (front panel-DB9 Female) to RS-422 (rear panel terminal block),
Baud Rate: Determined by RS-232 device, (up to 100 k baud)
Indicators (2): LED indicators; TRANSMIT and RECEIVE
Power Requirement: 24 to 33 Vdc @ 125 mA, Ground-referenced
Dimensions: Height: 1.7 in. 4.3 cm
Length: 5.8 in. 15.0 cm
Depth: 2.0 in. 5.1 cm (case only)

2.5 in. 6.4 cm (including barrier block)

891-3031H

Radio Design Labs Technical Support Centers

U.S.A. [phone], [phone]; Fax: [phone]

Europe [NH Amsterdam] (++31) 20-6238 983; Fax: (++31) 20-6225-287