Satel SATEL-EASy+ YM6010, Руководство пользователя, Страница: 51 / 85

SATEL-EASy+
User Manual
Version 1.19
50
13 REPEATER MODE AND ADDRESSING
Repeaters and addressing may be used to extend the coverage area of a radio modem network,
and to direct messages to selected radio modems in the network. In large systems, with several
repeaters and formed repeater chains, it is often practical to use routing instead of plain
addresses.
13.1 Repeater
In circumstances where it is necessary to extend the coverage area of a radio modem network,
modem can be used as repeater stations. The Repeater Function is switched ON by user
settings.
The maximum size of a repeated data packet is 1kB (kilobyte). In the repeater mode the radio
modem will function as a totally independent unit, which means that only a power supply and a
suitable antenna are needed. Other devices are not necessary.
A radio modem acting as a repeater can also be used to receive and transmit data. In repeater
mode the radio modem will transmit the received data to the serial interface in a normal
fashion. The difference being that the received data will be buffered into the buffer memory.
After reception the radio modem will re-transmit the buffered data using the same radio
channel as in reception. Data received through the serial interface a radio modem in repeater
mode will transmit normally.
The same network may include several repeaters, which operate under the same base station.
Repeaters may also be chained; in which case a message is transmitted through several
repeaters. In systems with more than one serially or parallel chained repeaters, addressing or
routing protocol must be used to prevent a message ending up in a loop formed by repeaters,
and to ensure that the message finally reaches only the intended radio modem.