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Alarmierungssysteme
• RS232 / RS485 up to 115 200 bits/sec
• Licence-free 868MHz radio band
• Single hop distance 5 km line-of-sight
• Repeater function for longer distances, unlimited repeater hops
• Forward error correction, CRC error checking with ARQ
• Turn-around time 5 msec
• Radio signal strength and BER indication
• Configurable on-line by Hayes AT commands, or Windows configuration software
• Transparent broadcast mode, peer to peer
• Addressed mode, multipoint and point-topoint
• Low power mode with DTR control
• On-line “dial-up” control using AT commands
• Repeater functionality in all units
• Repeater routing via address selection
• Security against cross-talk between systems
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Power Supply
• 10 - 30 VDC or 10 - 24 VAC supply
• Normal current drain 70mA/12VDC or 50mA/24VDC
• Current when transmitting 350mA/12V or 250mA/ 24V
• Low power mode current drain 20mA/12VDC or 15mA/24VDC
General
• Environmental -40 to 60 degC, 0 to 99 %RH
• EMC Compliant ETS 300 683
• Housing, extruded aluminium case 114 x 185 x 30 mm DIN rail mounting, removable terminal blocks for ease of module
replacement, terminals suitable for 2.5sqmm conductors.
• LED indication for unit OK, radio TX and RX, serial TX and RX, DCD (comms OK).
Serial Port
• Standard data rates 1200 to 115200 baud.
• RS232 and RS485 standard interface connections provided, each connected to the same serial port. Serial interfaces are
asynchronous non-return-zero (NRZ) format.
• Characters supported 7 or 8 data bits, even/odd/no parity, 1 or 2 stop bits
• RS232 connection provides full duplex operation as a DCE device with RTS/CTS hardware handshaking- standard D9
connector.
• RS485 connection provides half duplex operation for twistedpair multidrop networks.
• Input and output buffers 2Kbyte
Radio Transceiver
• Single channel, synthesised transceiver
• Frequency 869.4 - 869.65 MHz, 250KHz channel
• Transmit Power 500mW
• RSSI -60 to -120 dBm
• Expected line-of-sight range, 5 km at 19200 bits/sec
• RF Data Transmission Rate - 19200 baud, 38400 baud, 76800 baud
• Range may be extended by:-
- up to five intermediate repeaters for controlled mode
- inlimited repeaters for transparent mode
• Conforms to EN 300 220
• Antenna connection is SMA coaxial
Data Transmission
• Transparent mode: Data is transmitted with a system and group address. Data transmission begins as serial data is
received – maximum packet size is 530 bytes. All modules, with correct system address, which receive the data packets,
outputs the data - error checking is optional.
• Controlled mode: Data is transmitted in packets with a system address, source address, destination address, up to
five intermediate repeater addresses, and a 16 bit CRC error check. If the packet is received with a correct error check,
only the destination module will output the data and will also return an ACK transmission. If the source module does not receive the ACK, it will retry a further four times. DCD provides communications status.
• Auto-connect and dial-up-control modes are available.
• CTS/RTS flow control provided based on input buffer availability.
Configuration and Diagnostics
• Configuration by freeware software package or by Hayes
AT commands. Radio noise, signal strength and bit error
rate (BER) diagnostics included. Radio signal strength value
available on-line to host device.
