Radiometrix Ltd, FRPC2

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On receipt of a data packet from the host, the FRPC2 will append to the packet - preamble,

frame sync byte and an error check sum. The packet is then coded for mark:space balance and

transmitted. A full 60 byte packet is transmitted in 6ms of TX air time (60 data bytes @ 160kbps

+ 1.25ms).

Collision avoidance (Listen Before Transmit-LBT) functions can be enabled to prevent loss of

packets.

Data packets may be sent with either normal or extended preamble. Extended preamble is used

if the remote FRPC2 is in power save mode. Extended preamble length can be changed in the

EEPROM memory.

On detection of preamble from the radio receiver, the FRPC2 will phase lock, decode and error

check the incoming synchronous data stream and if successful. The data is then placed in a

buffer and the RX Request line is pulled low to signal to the host that a valid packet awaits to be

uploaded to the Host.

An in-coming data packet is presented back to the host in the same form as it was given.