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The 405U module may be powered from either a 12 VDC or 24 VDC power supply.
Normal supply 11-15 VDC. Alternate supply 18-28 VDC.
Current drain 155mA (@l2V) or 100mA (@24V).
Environmental -10 to 55 degC. 0 - 99 %RH.
EMC Compliant 89/336/EEC, EN55022, EN50082-1, AS3548.
Housing, extruded aluminium case 130 x 185 x 60 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).
Standard data rates 75,150, 300, 600,1200, 2400, 4800, 9600,19200 and 38400 baud.
RS232 and RS485 standard interface connections provided, each connected to the same serial port.
Serial interfaces are asynchronous non-return-zero (NRZ) format.
The following characters are supported (selectable) - 7 data bits, even or odd parity,1 start bit,1 or 2 stop bits; 7 data bits, no parity,1 start bit, 2 stop bits; 8 data bits, even or odd or no parity, 1 start bit,1 stop bit - the same type of character is created at the output.
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 twisted-pair multidrop networks.
Terminal connectors provided for RS485.
Single channel, crystal locked, direct frequency modulation, data rate configurable 1200, 2400, 4800 or 9600 bits/sec using four level DFSK.
Frequency 410 - 480 MHz,12.5KHz channel. Stability +/-1.OKHz
Transmit power 100/500mW or 10mW
Spurious emissions RX <-57dbm tx <-37dbm
Receiver sensitivity 0.4uV(-1l7dBm) @ l2dB SINAD
Signal detect/RSSI -120 to -100 dBm
Conforms to I-ETS 300 220, MPT1329, AS4268.2
Expected line-of-sight range (@4800 bits/sec) - l.5km(l0mW), 5km(l00mW), 10km(500mW).
Range may be extended by up to five intermediate repeaters (controlled mode) or one repeater (transparent mode).
Aerial connection is BNC coaxial and protected by an internal gas discharge surge arrester.
Transparent mode: Data is transmitted as a 300 byte packet with a system address.
Data transmission begins as soon as serial data is received.
For RS232, DCD signal is always high, and CTS is high while there is space in the input buffer.
All modules, with correct system address, which receive the data packets, output the data without error checking.
Controlled mode: Data is transmitted in packets between 45 and 300 bytes (configurable), 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 before resetting the DCD output.
For RS232, the CTS signal is high if there is room in the input buffer.
Destination and repeater addresses may be configured using on-board miniature switches or by host using Hayes AT commands.
DCD output is FET 30VDC 500mA.
In transparent mode, the DCD output is always active.
In controlled mode, the DCD output is active when a communications channel has been established with the destination address. During communications failure, this output will reset.
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