SP2-433-160 Datasheet, PDF (4/27 Pages) Radiometrix Ltd – UHF SpacePort Transceiver

TRANSMIT
On receipt of a data packet from the host, the SP2 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
+ 1.75ms).
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 SP2 is in power save mode. Extended preamble length can be changed in the
EEPROM memory.
RECEIVE
On detection of preamble from the radio receiver, the SP2 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.
Radiometrix Ltd, SP2 data sheet
page 4