Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Issue 1, 20 May 2009
TDL3F
Transparent Data Link on 868/914MHz band
A TDL3F is a single channel, 869 or
915MHz wideband, transparent data
link. It has a TDL2A pin out (and
firmware), but uses a BiM3 series radio
module. TLD3F acts as a transparent
serial cable to attached host. TDL3F is
an intermediate level OEM radio
modem which is in between a raw FM
radio module like BiM3B and
a
sophisticated OEM radio modem like
RPM3. It takes care of preamble,
synchronisation, bit balancing and
error checking along with automatic
noise squelching.
Figure 1: TDL3F-868.30-9 radio modem
The TDL3F provides a half duplex link. Provided no two devices attempt to transmit simultaneously no
further restrictions on data transmission need be made, as all transmit timing, valid data identification
and datastream buffering is conducted by the unit. Synchronisation and framing words in the packet
prevent the receiver outputting garbage in the absence of wanted RF signal or presence of interference.
For multiple radio systems (polled networks) a TDL3F can be set to 1 of 8 unique addresses.
Features
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Conforms to EN 300 220-3 and EN 301 489-3
Crystal controlled PLL FM circuitry for both Tx and Rx
SAW front-end filter
Single conversion superhet
Serial modem baud rate at 9600bps (half-duplex)
Addressable point-to-point
Applications
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PDAs, organisers & laptops
Handheld / portable terminals
EPOS equipment, barcode scanners
In-building environmental monitoring and control
Remote data acquisition system, data logging
Fleet management, vehicle data acquisition
Technical Summary
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Operating frequency: 869.85 / 868.30MHz (Europe), 914.5MHz (North America)
Modulation: 16kbps bi-phase FSK
Supply: 5V at 18mA transmit (@5mW), 15mA receive/idle
Transmit power: +5mW @ 869.85MHz)
Receiver sensitivity: -106dBm (for 1% BER)
32 byte data buffer
Radiometrix Ltd
TDL3F Data Sheet
page 1
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