Radius PDR 221

Radius PDR 221-Radius PDR 221

Sipariş No : Radius PDR 221

PDR 221 is protocol transparent and thus capable to transport any serial protocol. Due to transparency, it has the advantage of very low latency (no buffer) so it provides very fast data turnaround times. PDR 221 is ideal for any system requiring point-to-multipoint, peer-to-peer or a broadcast network.

Radius PDR 221

Protocol transparent radio modem 

  • Dual RS232 Ports
  • Ethernet bridging & IP –filtering
  • TCP/UDP serial device server
  • Exceptional Receiver Sensitivity
  • Real-Time Radio System Monitoring
  • Collision Avoidance Technology
  • Wide Temperature Range
  • Forward Error Correction improves throughput
  • Remote Diagnostics, Tx Power and Frequency Change

PDR 221 is protocol transparent and thus capable to transport any serial protocol. Due to transparency, it has the advantage of very low latency (no buffer) so it provides very fast data turnaround times. PDR 221 is ideal for any system requiring point-to-multipoint, peer-to-peer or a broadcast network.

PDR 221 - Transparent Mode

The PDR 221 has all of the same features as the PDR 121, except for only 1 repeater per system. But because it is transparent it has the  advantage of very low latency (no buffer) so it provides even faster data turnaround and is ideal for any system requiring point-to-multipoint, peer-to-peer or even an all-informed network. A PDR 221 network can have up to 254 slaves and 1 master and you decide via the simple configuration menus which unit does which job.

Communication Range

The distance between any two devices is based on the data rate, the frequency utilised, the type of antennas employed and the reliability required. As an example we have working systems in the VHF spectrum communicating up to 50km and in the UHF spectrum up to 30km. Given that the PDR can forward data messages to its neighbours it is conceivable to have an area coverage of several 1,000km2. Since the PDR has outstanding receiver sensitivity it is able to communicate over distances not achievable by other wireless devices.

Security & Reliability

Each radio has an option in the menu to invoke 128-bit encryption over-the-air and all PDR radios also carry unique radio identities so that you can be confident that no-one can listen to or be interfered with by your wireless data radio system. The PDR also features Forward Error Correction with interleaving in order to increase immunity to interference, often recovering data packets with 30% or less corruption.

Data Interface

The PDR supports dual RS232 ports and an Ethernet port. This allows a variety of interfaces to the central system and the slave devices as well as the possibility to mix host systems

Diagnostics & Over Air Programming

Each PDR comes with a comprehensive menu system that allows the user to very easily perform measurements of their wireless network. This includes data on the signal strength and power output of each device in the network and a Bit Error Rate between any given units.


The tuning range of the radio is up to 40MHz, allowing users to easily migrate frequency within band and to employ duplex frequencies with a very wide separation. Power output can be set from a few milliwatts to 5W via the user interface. Signal strength can also be adjusted to suit noisy environments. Lastly the PDR is designed so that you do not need a costly central unit, since any device can be set up to act as master or slave.

Data Rates & Collision Avoidance

On air data rates up to 19.2kbps, before compression. After data compression the effective data rate can be much higher. The PDR also supports a configurable collision avoidance technique to optimise channel usage and minimise data turnaround.

Radio Transceiver
  • Data Rates:
    • 4800/9600 @ 12.5 kHz
    • 9600/19200 @ 25 kHz
  • Frequency Range:
    • UHF 470 to 510 MHz
    • UHF 435 to 470 MHz
    • UHF 395 to 430 MHz
    • UHF 360 to 390 MHz
    • UHF 350 to 360 MHz
    • UHF 330 to 350 MHz
    • VHF 140 to 174 MHz
    • Other bands available on request
  • Operation Modes: Half duplex, Simplex
  • Modulation: 4 LFSK
  • Forward Error Correction: Yes, interleaving functionality
  • Collision Avoidance: Yes, configurable
  • Repeating: 1 repeater per system
  • No. of Remote Radios/Master: 255
Radio Transmitter
  • Tx Power: 10 mW to 5.0 W adjustable
Radio Receiver
  • Sensitivity: -110 to -118 dBm @ BER CCRR: (Co-Channel Rejection Ratio) Better than -8 dB
Radio Diagnostics
  • Software package Radius RND 100 gives RSSI, temperature etc.
  • Temperature Operating Range: -25 ... +75 oC
Physical Dimensions
  • Size: (HxWxD) 40 x 193 x 115 mm
  • Weight: 800 g (1.76 lb)
  • Housing Material: Aluminium
Power Supply
  • Operating voltage: 12 VDC.  Input voltage range 10.8 - 15.6
  • Main Power Supply: 2 pole, female
  • Battery Supply: 2 pole, female
  • Electric Current Requirement: 
    • 2000 mA at 2W Tx
    • 2500 mA at 5W Tx
  • Antenna: BNC, female
  • Serial Ports:
    • 2 x RS232 DB9 female, wired as DCE (modem)
    • Data Rates: 600 to 57600 bps
    • Flow Control: RTS/CTS, DCD selectable
  • Ethernet Port: TCP/IP, UDP/IP, SNMP
  • Configuration: via RS232 port
Indications (LED)
  • LED Indicators: Main PWR, Radio Rx, Radio Tx, RS232 Rx RS232 Tx, Configuration Mode, Carrier Detect, System Detect
  • Transparent. Manage nearly all current data protocols.
Configuration Interface
  • Configuration Software: Standard Windows Terminal Software
  • Data Rate: Selectable 1200/9600/57600 bps



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