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BHX2_12

器件型号:BHX2_12
文件大小:4819.72KB,共0页
厂商名称:RADIOMETRIX [Radiometrix Ltd]
厂商官网:http://www.radiometrix.com
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BHX2_12器件文档内容

                 Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
                 Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com

BHX2                                                              Issue 1, 26 July 2012

NBFM Multi-channel 500mW UHF Transceiver

The BHX2 transceiver module offers a
500mW RF power output in the UK
458MHz band. This makes the BHX2
ideally suited to those low power
applications where existing multi-channel
narrow band devices like TR2M have
insufficient range.

                                                            Figure 1: BHX2-458-5-SMA

Features

Conforms to EN 300 220-3 and EN 301 489-3
Any 5MHz band module from 420 - 480MHz available as factory tuned custom variant
High performance double superhet, 128 channel PLL Synthesizer with TCXO
Data rates up to 5 kbps for standard module
Usable range over 5km
Fully screened
Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband)
Incorporates a 1200baud dumb modem
User configurable via RS232 interface

Low power requirements

Applications

          Handheld terminals
          Heavy vehicle/machine remote controls
          EPOS equipment, barcode scanners
          Data loggers
          Industrial telemetry and telecommand
          In-building environmental monitoring and control
          High-end security and fire alarms
          Vehicle data up/download

Technical Summary

          Operating frequency: 458.5-459.1MHz
          Custom variants from 420MHz to 480MHz on any 5MHz band
          23 channels in 458MHz band (128 channels max.)
          Transmit power: +27dBm (500mW) nominal
          Supply range: 5.5V - 15V
          Current consumption: 350mA transmit, 30mA receive
          Data bit rate: 5kbps max. (standard module)
          Receiver sensitivity: -118dBm (for 12 dB SINAD)
          Size: 85 x 39 x 13 mm (RF pin version)

Evaluation platforms: NBEK + BHX carrier

Radiometrix Ltd                           BHX2 Data Sheet                                   page 1
                                  Figure 2: BHX2 block diagram

Radiometrix Ltd  BHX2 Data Sheet                                page 2
Figure 3: BHX2 Footprint (Top) view

User Interface

Pins  Name       Function
1     TXE        Transmitter Enable. Low = ON, Open = RX mode. Internal 10k pull-up to 4V
                 DC coupled digital data input for 3-12V CMOS logic. Leave open if unused
2     TXD        50mV - 2.5v p-p AC coupled input. Variable gain
3     AF in      DC level between 0.5V and 2.5V. 60dB dynamic range
4     RSSI       Noise operated carrier detect. Open collector. ON/low = no signal
5     SQF        200mVpk-pk audio. DC coupled, approx 1V bias. Muted by squelch
6     AF out     Open collector output of data slicer suitable for Biphase codes
7     RXD        Regulated DC supply. 75mA max. drain. Present if unit is powered
8     +4.4V out  Ground
9     0V         Serial programming/configuration input at RS232 level
10    PGM
11    P1         Parallel frequency select inputs. Inverted logic, internal 10k pullups to 4.4V
12    P2
13    P3

Notes:
    1. BHX2 transmitter section inverts sense of the baseband stream, so a logical inversion is
         present between input of TX and output on RX
    2. Carrier detect mutes the AF and DATA outputs. It can be disabled by rotating the level set
         trimmer fully ACW.
    3. There are no pullups on the open collector outputs.
    4. The sofware incorporates a 1200baud dumb modem, compatible with that implemented in
         TX2M, RX2M, TR2M, SMX2 and UHX2 radios ( i1200 tones and format ).
    5. RS232 input pins (10 and 11) tolerate true +/- levels. No buffering is required.
    6. This unit actually consists of a TR2C RF board and an AFS2-458 amplifier module,
         combined with a 5v LDO
    7. In future versions of the software, pin 13 will have a modem handshake function
    8. The BHX2 has the same footprint/pinout/function as the TR2M (TR2B), but the case is
         longer, and the RF output is a coaxial connector. Compared to an TR2M, the minimum
         supply voltage is higher (5.5v vesus 4.5v).

Radiometrix Ltd                      BHX2 Data Sheet  page 3
    TXE (MOD TX_ON) (1)                         Transmit Enable
                      TXD (2)                   Data Out
                     AF in (3)                                      Host Microcontroller
                      RSSI (4)                  ADC
                      SQF (5)                                                                        PC serial port
                                1k  Carrier Detect                                                                      1
                   AF out (6)                              Data In                                                 6
                                                                                                                           TXD
BHX2 RXD (7)                        10k         VDD                                                                    2   SGD
             + 4.4V out (8)                                                                                        73
                     GND (9)             100nF
                   PGM (10)                                                                                        8
                       P1(11)                                                                                          4
                      P2 (12)
                      P3 (13)                                                                                      9
                                                                                                                       5

                                                Parallel
                                                Channel
                                                Selec t

Figure 4: BHX2 interfaced to host microcontroller and serial port for configuration

BHX2 can be directly interfaced to a host microcontroller which can generally be powered by the
regulated +4.4V output on pin 8 of BHX2. Three I/O pins on the microcontroller port can be
assigned to select the first 8 channels on frequency table of the appropriate band for which the
module is configured by pulling the P1-P3 pins low. Channel select pins of BHX2 have internal pull-
up to 4V supply rail, hence channel selection operate on inverted logic.

Channel          P3:P2:P1                458MHz band
0                111                     458.525
1                110                     458.550
2                101                     458.575
3                100                     458.600
4                011                     458.625
5                010                     458.650
6                001                     458.675
7                000                     458.700

Digital Received Data Output (RXD) pin is an open collector output, which should be pulled-up to
required voltage swing level (e.g. +4.4V or Vcc).

BHX2 has an automatic noise squelching function which is activated when there is not any RF
signal at detectable level on the channel or if the non-coherent noise like interference level is high
enough to block any weak RF signal from being received. SQF is provided as an open-collector
output for monitoring which should be pulled-up to required voltage swing level. SQF output will
jump to pull-up voltage level if received RF signal level at the RF In/Out pin of the module is about
3dB below the level required to produce 12dB SINAD level on demodulated AF Output signal. SQF
pin can be connected to an LED to act as a Carrier Detect indicator. Pull-up resistor value should

be reduced (e.g. 1k) according to the current requirement to produce satisfactory brightness on
the LED used.

BHX2 can be configured using any PC/Laptop/PDA having a serial port and modem/terminal
program. TXD (pin 3) of DB9M connector can be directly wired to PGM (pin C10) of the BHX2 and
SGN (pin 5) of DB9M connector should be either connected to common ground or pin C9 of the
BHX2.

The whole frequency/channel table is user reconfigurable to 128 channels within 5MHz band of
supplied frequency subject to regulatory band limits. Serial Channel Selection via PGM pin gives
access to the whole of regulatory band allocation for 458.525MHz-458.925MHz (23 channels).

Radiometrix Ltd                                      BHX2 Data Sheet                                                            page 4
Received Signal StrengthRSSI output (V)
         2.5

         2.3

         2.1

         1.9

         1.7

         1.5

         1.3

         1.1

         0.9

         0.7

         0.5
            -130 -120 -110 -100 -90 -80 -70 -60 -50 -40
                                                 RF Level (dBm)

Figure 5: RSSI voltage variation with respect to RF level at BHX2

If the microcontroller has a built-in Analogue to Digital Converter (ADC), the Received Signal
Strength Indicator (RSSI) output voltage level can be read by the microcontroller to estimate its
distance from transmitting BHX2 unit or identify areas of weak signal reception.
RSSI can also be used to make a decision to switch to the second antenna in fixed installations
within building where the probability of null-spots are higher.

Radiometrix Ltd  BHX2 Data Sheet  page 5
BHX2 serial configuration commands

2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control

SINGLE nnnnn            Set value of N for single channel operation

GOCHAN xx               Serial select of channel xx (0 to 127)

LOADMX xx               Set highest permitted (serial selected) channel xx (others default to

                        ch0)

LOAD aa nnnnn           Set value of N for channel aa (channels 0 to 15)

LOADTB nnnnn            Set value of N for channel 16 (channels 17 to 127 then in sequence)

RVALUE rrrr             Enter value for R register

SETPAR                  Channel selected by 3 bit parallel input (0 to 7). Disable modem

SETSER                  Channel selected by most recent 'gochan' operation

SETMOD                  Enable internal modem. Frequency selected by most recent 'gochan'

                        or 'single'

OFFSET                  Set receive frequency offset (for 25KHz this is 1800)

GOTEST                  250Hz test tone transmission

                    Process entry

/                       Clear all buffers

xx = channel number from 00 to 127

aa = two digit channel number from 00 to 15

nnnnn = synthesizer N register value, (up to 65535)

rrrr = synthesizer R register value, (up to 16383)

N = f RF = 458.525MHz = 18341                       R = fTCXO = 13MHz , So R=520
      f Channelspacing  25kHz                            f channelspacing 25kHz

On receive, the local oscillator operates at 45MHz (the first IF) below the carrier.
An OFFSET value is subtracted from the channel's N value when the unit is switched into RX

      OFFSET = First IF / Fc, so, OFFSET = 45MHz / 25KHz = 1800 (usually)

Notes:
    1. A pause of at least 50ms must be allowed between command strings (EEPROM
         programming time)
    2. SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative
         after a power down until either another valid SINGLE command is received, or mode is
         changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for
         frequency agile applications.
    3. /SETPAR command should be issued at the end of channel programming to put the module
         back into parallel frequency select mode
    4. In 458MHz band, channel 12 (458.825MHz) and channel 15 (458.900MHz) are allocated
         specifically for fixed alarm and radio keys/vehicle paging applications respectively and
         should not be used for general purpose applications.
    5. User can modify the frequency table of 128 channels to any desired frequency by changing

         N, R values of synthesizer within 2.5MHz of factory set Channel 0 frequency subject to the
         Radio Regulatory Band Allocation in the country of intended use.
    6. All other frequency, power, analogue input gain and automatic noise squelching adjustment
         will be treated as custom variants of the module to be set by factory.

Radiometrix Ltd                        BHX2 Data Sheet                                      page 6
Pin description of BHX2 with Modem mode selected

The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmit keyed when valid
serial data is present, so no separate TX control needed. Coding in the datastream also permits
the receiver to ignore noise and only output valid serial data). This is a half duplex unit, so
collisions between transmitted and received packets must be dealt with by the user.

Pin Name                          Function
1 MOD TX_ON                       Open = normal modem operation. Low = constant TX (for test). 10k
                                  pullup to 4V
2 MOD NC                          Leave open
                                  Leave open
3 MOD NC                          DC level between 0.5V and 2.5V. 60dB dynamic range
                                  Leave open
4 RSSI                            Modem tones or noise present
                                  Leave open
5 MOD NC                          Regulated DC supply. 75mA max. drain. Present if unit is powered
                                  Ground
6 AF out
                                  Serial programming/configuration input at RS232 level
7  NC
                                  RS232 data input (true). 10k pullup to 4V
8 +4.4V out                       Inverted RS232 data out (to inverting buffer like MAX232)
                                  Leave open
9 0V

10 PGM

11 MOD TXD

12 MOD RXD

13 MOD NC

BHX2s on both ends should be configured to required operating frequency using
GOCHAN command before starting to use the internal 1200 baud modem, because the
P1-P3 pins will be used as Modem Data pins and the modem will operate on the last
serially selected channel after SETMOD command is used to enable the Modem.

     TXE (MOD TX_ON) (1)                        Serial COM Port
         TXD (MOD NC) (2)
                                  SW1                1  RXD
        AF in (MOD NC) (3)                 VDD  62      TXD
                        RSSI (4)
                                                73      SGD
         SQF (MOD NC) (5)
                    AF out (6)                  8
                                                    4
         RXD (MOD NC) (7)
               + 4.4V out (8)                   9
                                                    5
BHX2 GND (9)
                    PGM (10)
        P1 (MOD TXD) (11)
        P2 (MOD RXD) (12)
         P3 (MOD NC) (13)

                                                            RS232 driver

Figure 6: BHX2 interfaced to PC serial port in modem mode

Note:
Baud rate used for Modem is half that of used for serial configuration. Attached RS232
devices should be set with the following:

         1200bps, 8 Data bits, No Parity, 1/2 stop bits, no flow control

TXD (Pin 3) of a Serial Port can be switched from PGM (Pin C10) to MOD TXD (Pin C11)
with no RS232 driver in between. However, MOD RXD (Pin C12) requires an RS232 line
driver before it can be connected to RXD (pin 2) of a serial port. Some of the RS232 line
drivers can be powered from the regulated +4.4V out (Pin C8).

Radiometrix Ltd                                 BHX2 Data Sheet  page 7
Condensed specifications

Frequency                     458.5-459.1MHz (any 5MHz band from 420-480MHz)
                              and any 3MHz band from 210 270MHz
         Frequency stability  +/- 1.5kHz
         Channel spacing      25kHz (12.5kHz by special order)
         Number of channels   128 channels controlled via RS232 interface (8 parallel
                              selected)
Transmit
Output power                  +27dBm (500mW) 1dB
TX on switching time          50 ms
Modulation type               FM, FSK (F1D, F3D)
TX modulation bandwidth       DC 3kHz
Adjacent channel TX power     -37dBm
Inputs                        analogue, data (CMOS/TTL compatible)
Receive
Sensitivity                   -118dBm for 12 dB SINAD
                              -70dB
     image / spurious         -85dB
     blocking                 <-65dB (Tested per. ETSI EN 301 489-3)
     adjacent channel         RSSI, carrier detect, audio, data
Outputs                       Compliant with ETSI EN 300 220-3 and EN 301 489-3
Spurious radiations           28ms (no noise mute)
Power on to valid audio       45ms (with noise mute)
Power on to valid audio       50ms (with or without mute)
Power on to stable data out
(50:50 mark / space)

Supply             Voltage    5.5 - 15V (+5V regulated version available)
                   Current    350mA nominal transmit
                              30mA receive
Interface
                              13pin 0.1" pitch molex
                   user       2pin 0.1" pitch molex
                   Power      3pin 0.1" pitch molex
                   RF         or SMA (long, bulkhead mounted type) or MCX
                              1.2mm (min.)
Recommended PCB hole size     85 x 39 x 13 mm Case only (RF pins version)
Size                          92 x 39 x 13mm (including MCX)
                              105 x 39 x 13mm (including SMA)

Operating temperature         -20 to +60 C (Storage -30 to +70 C)

Intended approval             ETSI Radio standard EN 300 220-3 and EMC standard EN 301

                              489-3

Notes: 1.The data slicer cannot be depended upon for data waveform frequencies below 250Hz

2. When RX is on and a transmitter keys up, again a 50ms period is required to stabilise

        data output mark/space. i.e. allow at least 50ms of preamble

Ordering Information:

Part No.           Antenna connector  Frequency band
BHX2-458-5
BHX2-458-5-SMA     RF pins            458.5 - 459.1MHz
BHX2-458-5-MCX
BHX2-xxx-5         SMA                458.5 - 459.1MHz
BHX2-xxx-5-SMA
BHX2-xxx-5-MCX     MCX                458.5 - 459.1MHz

                   Where xxx is any 5MHz band from 420-480MHz)

                   and any 3MHz band from 210 270MHz

Radiometrix Ltd                       BHX2 Data Sheet                      page 8
Radiometrix Ltd

Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233

sales@radiometrix.com
www.radiometrix.com

Copyright notice

This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in
whole or in part must give clear acknowledgement to the copyright owner.

Limitation of liability

The information furnished by Radiometrix Ltd is believed to be accurate and reliable. Radiometrix Ltd
reserves the right to make changes or improvements in the design, specification or manufacture of its
subassembly products without notice. Radiometrix Ltd does not assume any liability arising from the
application or use of any product or circuit described herein, nor for any infringements of patents or other
rights of third parties which may result from the use of its products. This data sheet neither states nor
implies warranty of any kind, including fitness for any particular application. These radio devices may be
subject to radio interference and may not function as intended if interference is present. We do NOT
recommend their use for life critical applications.
The Intrastat commodity code for all our modules is: 8542 6000

R&TTE Directive

After 7 April 2001 the manufacturer can only place finished product on the market under the provisions of
the R&TTE Directive. Equipment within the scope of the R&TTE Directive may demonstrate compliance
to the essential requirements specified in Article 3 of the Directive, as appropriate to the particular
equipment.
Further details are available on The Office of Communications (Ofcom) web site:

      http://www.ofcom.org.uk/

Information Requests                       European Communications Office (ECO)
Ofcom                                      Peblingehus
Riverside House                            Nansensgade 19
2a Southwark Bridge Road                   DK 1366 Copenhagen
London SE1 9HA                             Tel. +45 33896300
Tel: +44 (0)300 123 3333 or 020 7981 3040  Fax +45 33896330
Fax: +44 (0)20 7981 3333                   ero@ero.dk
information.requests@ofcom.org.uk          www.ero.dk
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