User guide

1892 1139 - RSX Range of Intelligent Modems User Guide - v7.1 / Nov 2007 3
INTRODUCTION
The Wood & Douglas RSX Series Radio Modems are high-speed intelligent radio
modems providing a half-duplex data link over a distance of up to several kilometres,
depending on the frequency chosen. They use GMSK (Gaussian Minimum Shift Keying)
modulation to achieve an RF data rate of 4800 baud in a 12.5kHz channel and 9600 baud
in a 25kHz channel. Serial data is passed to and from the modem via an RS232 port at
speeds of up to 38,400 baud, and all buffering and radio management is carried out
transparently by the unit.
The unit will typically be used as supplied with no setup required, wired to customer data
equipment and a power supply. However, the modem and radio parameters are user-
configurable if required, either by sending serial codes or using proprietary set-up
software obtained from the Wood & Douglas website (www.woodanddouglas.co.uk) or
Sales at Wood & Douglas.
The modem uses the SXn50G range of radios which are high quality, very compact
synthesized transceivers producing 500mW maximum RF output. The SXn50G range is
approved to EN 300 220 and ETS 300 086. The UHF SX450G is also approved to
MPT1411. The RSXn50G is approved to ETS 300 113 making it universally attractive for
both telemetry and mobile radio data.
The three variants in the RSX series are:
RSX150G covering the range 100 - 225MHz
RSX450G covering the range 400 - 490MHz
RSX850G covering the range 868 - 870MHz
collectively referred to as RSXn50.
Units can be ordered covering a frequency band within these ranges, and operate by
default on a particular frequency within that band.
The RSXn50 is available in a rugged diecast enclosure for general use, or as an OEM
PCB for inclusion in other equipment.