STD-502-RSaelig Logo




: December 10, 2013
   Alan Lowne, President, Saelig Company, Inc.
             Tel: (585) 385-1750 Email:


Saelig Introduces DSSS 2.4GHz Low Power Radio Transceiver
STD-502-R is a true diversity embedded receiver containing two built-in receiver circuits.

Fairport, NY, USA:  Saelig Company, Inc. ( has introduced the STD-502-R 2.4 GHz transceiver which uses direct sequence spread spectrum (DSSS) modulation and a true diversity circuit, enabling reliable communications even in the congested 2.4 GHz band. The STD-502-R complies with the European ETSI EN300440, U.S. FCC Part 15.247 standards and Japanese ARIB STD-T66 standard, making it ready for the global market.

Low power consumption and battery operation give the STD-502-R the performance demanded for applications where long range and reliability are required. The transceiver uses a transparent data interface to enable users to communicate using their own protocols with 77 available channels at a line-of-site range of up to 300m.   Designed to be embedded in equipment, the STD-502-R was developed as a radio module for industrial applications that require reliable operation. Besides using highly noise-resistant direct-sequence spread spectrum (DSSS) modulation, the module has a true diversity receiver function for preventing signal dropout due to multi-path fading.

The modules can be set easily via the RS-232 UART interface using dedicated commands. Spread-spectrum correlation (a key part of spread spectrum communications) is done in a custom onboard ASIC instead of relying upon conventional RFICs, which guarantees the long-term supply of key radio components required in industrial devices.

The STD-502-R module itself has no built-in communication protocol. Instead, it has a transparent RS-232 data input/output interface, enabling users to employ their own protocols without modification. In addition, it can continuously transmit a LOW or HIGH signal without restriction, which was not possible with earlier models. 

An evaluation board – the TB-STD502 - allows evaluation of the STD-502-R module, to perform range, data packet, and switching signal transmission tests. Onboard LEDs, CH switch, ID switch and push buttons can exercise switching signal tests and packet tests with packet error indication. The ST-502-R is designed for an operating temperature range of -20 to +65 °C with an RF power of 10mW  (3.3 V 65 mA) and intended for the remote control of industrial equipment or for industrial measurement systems. The ST-502-R is made by Circuit Design - a leading Japanese low power radio product design and manufacturing company.  

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