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The 3AS range of radio modems allows serial data lines to be easily extended to 3km or more, without needing a licence. As well as being useful in many stand-alone applications, they complement the other serial connectivity and serial instrumentation products offered by Celsum Technologies.

Features

Data speed (through the air) 19,200 bit/s at 25 kHz and
                                                 9,600 bit/s at 12.5 kHz
Serial interface data speed 300 to 38400 bit/s
Serial interfaces RS-232, RS-422 or RS-485
LCD display and four push buttons in 3ASd
Error correction (FEC)
Repeater function
Addressing for easy network design
Programmable output power 10 mW...1 W
ETSI approved
Can be used in conjunction with the 321 battery pack for data on the move

SATELLINE-3AS is a half-duplex radio modem suitable for a variety of data transfer applications, in particular, those demanding high speed and precision. In addition to the maximum data speed of 19.2 kbps and channel spacings 25 kHz or 12.5 kHz, 3AS offers a number of additional features and functions to make it one of the most versatile and easy to use radio data modems in the world.

The model 3AS offers RS422/RS485 as well as the standard RS232 serial interface protocols. The new optional interfaces extend the capability of the modem and will be particularly welcome for the process control applications.

The SATELLINE-3AS software includes selectable error correction, to reduce errors caused by interference

SATELLINE-3AS is compatible with the interface types RS-232, RS-422 and RS-485. Software updates can be downloaded via the RS232 interface

The SATELLINE-3ASd is equipped with a LCD display of its own, which facilitates programming of the radio modem without the aid of a PC this is particularly useful if you are in a remote location.

Higher speed - Greater Throughput
In most cases, radio data networks have continuous growth, therefore speed and the accuracy of the data tranferred is important. The 3AS radio data modem is capable of 19.2kbps through the air with full error checking if required. Currently the largest single installation on a 3km site has over 250 modems and is still expanding

The SATELLINE-3AS offers several new options related to the use of the radio modem. For the first time, there is a built-in hardware compatibility with three selectable data interfaces, the RS-232, RS-422 and RS-485.

A special model of the radio modem, the SATELLINE-3ASd, is equipped with a LCD display, which provides the user with several new, useful functions. The display can be utilised in the Setup mode for example, during the implementation stage. Thanks to the display it is possible to change the setups of the radio modem in the field without using an external terminal. It can also be used for testing the quality of the radio connection between the stations.

A versatile radio modem with a number of user's choices
The SATELLINE-3AS radio modem consists of a synthesized transceiver and a modem board, packed in a compact aluminum case. The Model SATELLINE-3ASd is additionally equipped with an LCD display and a four key keypad to allow parameter changes to be made without a computer connected.

SATELLINE-3AS exhibits a maximum data speed of 19.2 kbps. Two channel spacings, 25 kHz and 12.5 kHz are available. The corresponding numbers of radio channels are 80 and 160, respectively.

SATELLINE-3AS is compatible with the three most widely used standard data interfaces RS232, RS422 and RS485. The radio modem can be connected to a terminal with any one of these interfaces. The data speed is selectable within the limits 300 to 38,400 bps. There are two data ports, both 15-way subminiature D connectors. Port 1 is RS232 only, and is used for CONFIGURATION mode, and Port 2 may be configured to be RS232, RS422 or RS485.

The SATELLINE-3AS error rate is minimized by means of advance checking and correction of the data packets. In Forward Error Correction (FEC), the data packets are split in several blocks. The radio modem adds correction information inside the blocks at transmitting.

The radio modem has three basic operating modes: Data Transfer mode, Setup mode and Test mode. In the basic SATELLINE-3AS, the setting of operating parameters and selection of mode and function is performed with a PC through the RS interface. The SATELLINE-3ASd is equipped with a LCD display and four push buttons. In addition to changing the setups of the radio modem, the display is used for testing the operating condition of the radio connection.

The software of the SATELLINE-3AS resides in a flash memory. Updating of the radio modem programs is entirely software-based. The flash memory is reprogrammable through a serial interface.

SATELLINE-3AS can be operated at a voltage range 9 to 30 V. In practice this means that the radio modem is adaptable to both 12 Vdc and 24 Vdc systems.

Auxiliary functions
In case there is a need to extend the coverage of the radio modem network, the SATELLINE- 3AS radio modem can be used as a repeater station. In the repeater function, it receives a data packet (max length 1 kB) and transmits it immediately further.

With the radio modem in the Test mode, the state of the radio connection can be tested by means of data packets or the carrier wave.

The Data Transfer mode of the SATELLINE-3AS includes a Command Program function in which the radio channel and addresses can be changed on-line from the serial port of the radio data modem. The changes are effected by means of a specific programming package (SL command), which is entered amidst ordinary data.

Low Voltage Versions  SATELLINE-3AS/(d)

After overwhelming demand  SATELLINE-3AS modems are available in Low Voltage versions. The range is from 6.5 V to 8.5 V with the nominal voltage being 7.2 Volts. They fall under the existing Type Approvals. This feature is especially useful, for example, in applications where the power is generated by battery or solar panels.

Evaluation Kit (Typical Order)
A typical initial order to test a point-to-point link in a lab or office environment would be as follows:

• 2 x 3AS Radio Data Modems 
• 2 x ¼-wave antennae           
• 1 x Standard Interface Cables 
• 1 x Program Cable               
• 2 x Power Supplies                
• Saterm Test Software

Check out the OFCOM regulations for UK use.

Technical Specifications