PLT_技术文档

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

Issue 2, 30 July 2012

PLT / PLR

NBFM Multi channel Data Packet Link Radios

Inexperienced users of ISM band radio modules often

require a totally transparent interface. This can require

considerable processing power, and buffer memory,

to be provided in the radio device.

The more experienced user, on the other hand, may

not want to write a raw radio interface, but desires a

module that gives more control over the datastream

than a 'beginners' solution.

The PL radios represent such a compromise solution.

Figure 1: PLT2 transmitter and PLR2 receiver

Features

ꢀ

Conforms to EN 300 220-3 and EN 301 489-3

High performance double superhet. PLL synthesizer with TCXO

SAW front-end filter

User interface speed: 9600bps for standard module

Usable range over 1km

Fully screened. Low profile

Re-programmable via RS232 interface

Low power requirements

Applications

ꢀ

Wireless handheld terminals

EPOS equipment, barcode scanners

Data loggers

Industrial telemetry and telecommand

In-building environmental monitoring and control

High-end security and fire alarms

DGPS systems

Vehicle data up/download

Heavy vehicle/machinery controls

Technical Summary

ꢀ

Operating frequency: 173.200 - 173.325MHz (UK band)

o

150.825 - 152.450MHz (Australian Band)

433.875 - 434.650MHz (EU band)

458.525 - 459.1MHz (UK band)

ꢀ

Other custom VHF and UHF bands

32 channels @ 25kHz channel spacing

Transmit power: +10dBm (10mW) / +20dBm (100mW)

Supply range: 3.1 – 15V (TX @ 10mW and RX), 4.1 – 15V (TX @ 100mW)

Current consumption: 34mA @ 10mW, 90mA @ 100mW (transmit) and 20mA (receive)

Data bit rate: 5kbps max. (standard module)

Receiver sensitivity: -118dBm (for 12 dB SINAD)

Serial configuration by inverted RS232 at 3V CMOS level

Evaluation platforms: NBEK + PL carrier

Radiometrix Ltd

PLT/PLR Data Sheet

page 1

PLT / PLR data packet link radios

The PL modules use the hardware of the existing LMT/LMR transmitter receiver pair, combined with

completely new firmware to produce a simple to use but readily controllable data link

Both radios have a similar pinout. The bidirectional DATA pin requires an inverted RS232 data interface, at

3V CMOS logic levels (Both DATA and FLOW are bidirectional. As outputs they are open drain pins with 50K

pullups to the internal Vcc, and 470 series protection resistors. Do not exceed 3v on these pins).

The CMD pin selects the operating mode: If pulled low, then serial data is routed to a command interpreter

(see 'programming') . If high (floating) then received bytes are loaded into the buffer (the PLR receiver only

inputs data in command mode of course).

When the buffer is full, the transmitter either sends a databurst immediately, or waits for a command from the

user

The transmitter data buffer size is pre-set by a user command (from 1-32 bytes)

The data format uses is modified biphase at a peak data rate of 2500 bits per second.

Each burst consists of a framing sequence, a two byte address, a two byte checksum, and a variable length

(1-32 bytes) data 'payload'. The payload length information is coded into the framer sequence.

Minimum length (1 byte) bursts take about 70mS (including all transmitter setup and power on/off timings),

while a full 32 byte burst requires over 250mS.

Data transfer rate is limited by the interface's inability to receive data while transmitting a burst (if FLOW is

high, then the PLT is not listening to the serial port at all), or to decode received packets while in the process

of outputting one

The standard products use a 9600 baud user interface speed. Slower versions are also available (1200,

2400 and 4800 baud, with suffixes -1, -2, and -4). The baud rate is not user programmable.

Radiometrix Ltd

PLT/PLR Data Sheet

page 2

Radiometrix Ltd

PLT/PLR Data Sheet

page 3

Figure 3: PLT footprint (top view)

Pin description – PLT

1a

Name

Vcc

Function

3.1 – 15V power supply (@ 10mW)

4.1 – 15V power supply (@ 100mW)

Ground

Transmit Enable (active low)

(link to 4b)

2a

3a

4a

0V

TXE

TXD

1b

2b

3b

4b

CMD

DATA

FLOW

T_out

Command mode select input

Serial data out/in

Buffer full / busy output

(link to 4a)

Notes:

1. This pinout is very similar to the LMT radios but the serial data is on pin 2b (not 1b, which is here

used as the command mode select input )

2. Serial programming is by an inverted, CMOS logic level, 9600 baud RS232 datastream applied to

the DATA pin (2b).

3. TXE has a 100kΩ pullup to Vcc

4. All pins are on an 0.1" grid

5. In the 'off' state a PIN switch open circuits the RF output pin. There are no 'off' state spuri.

6. 10mW unit will operate (with marginally reduced specifications and lower (6-8mW) output power)

from a 3.0V rail. This must be well regulated and without noise or ripple, as in this state the unit's

internal regulator no longer operates, and provides no supply rejection.

7. 100mW versions should not be run continuously from supply voltages > 9v

8. Do not exceed 3v logic levels on any input (4v for 100mW PLT units)

Application circuit

Antenna

3.1- 15V

VCC (1a)

GND (2a)

TXE(3a)

T

ransmit enable (active low)

TXD (4a)

1

PLT2

6

7

8

9

Vcc

2

3

TXD

(0-3V)

4

5

SGD

Figure 4 : Typical RS232 interface for programming and data input

Radiometrix Ltd

PLT/PLR Data Sheet

page 4

Radiometrix Ltd

PLT/PLR Data Sheet

page 5

Figure 6: PLR footprint (top view)

Pin description – PLR

1a

2a

3a

4a

5a

Name

Vcc

0V

RXE

RXD

N/C (AF out)

Function

3.1 – 15V power supply (@ 10mW)

Ground

Receiver Enable (active high)

(link to 4b)

700mV p-p audio. DC coupled, approx 0.8v bias

1b

2b

3b

4b

5b

CMD

DATA

FLOW

R_in

Command mode select input

Serial data out/in

Valid data/serial output in progress

(link to 4a)

DC level between 0.5v and 2.2v. 60dB dynamic range

RSSI

NOTES:

1. This pinout is very similar to the LMR radios but the serial data is on pin 2b (not 1b, which is here

used as the command mode select input )

2. Serial programming is by an inverted, CMOS logic level, 9600 baud RS232 datastream applied to

the DATA (2b) pin.

3. All pins are on an 0.1" grid

4. Unit will operate (with marginally reduced specifications) from a 3.0v rail. This must be well regulated

and without noise or ripple, as in this state the unit's internal regulator no longer operates, and

provides no supply rejection

5. Do not exceed 3v logic levels on any input

Application circuit

Antenna

3.1- 15V

(3V)

Receiver enable (active high)

NC

Vcc

PLR2

1

NC

6

7

8

9

2

Data

PGM

RXD

TXD

3

SW1

(0-3V)

4

5

SGD

Figure 7: Typical RS232 interface for programming input and data output

Radiometrix Ltd

PLT/PLR Data Sheet

page 6

Serial interface commands

A 9600 baud cmos level ‘inverted RS232 format’ (1 start bit, 8 data, 1or 2 stop bits, no parity) is used.

Serial data is sent to the DATA (2b) pin.

These units employs a sub-set of the programming commands used by standard LMT/LMR modules. As the

DATA pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command used for

LMT/LMR string is NOT required.

To successfully program the unit it must be in active state (RXE high, or TXE low), and CMD must be pulled

low. Provision should be made to force the unit into this state while programming (either a jumper, or a third

pin on the programming connector, could be used). The basic units do not provide local echo, but this is a

provision on the evaluation interface boards

Commands

Function

Note

GOCHAN aa

LOAD aa nnnnn

SINGLE nnnnn

RVALUE rrrr

AVALUE aaaaa

BVALUE bb

SVALUE sss

MVALUE mmm

ADDR xxxxx

CHAN aa

Serially select channel aa, (ch0 to ch31)

Set value of N register for channel aa, (Channels 0 to 31)

Direct override of N register value

Set value for R register

Responds with OK

No response

Set value for unit address

Set buffer size (01 – 32, PLT only)

Set ascii value of 'send' character

Set mode byte (0-255, PLT only)

Volatile short address

Volatile channel select

Transmitter test (carrier on, 250Hz square wave. PLT

only)

No response

TEST

(any character sent to the unit will exit 'test' mode)

Process entry

Clear all buffers

Clear data buffer

send burst (if data buffer isn't empty)

<cr>

/

<

>

Ascii 13

Ascii 47

Ascii 60

Ascii 62

aa = a two digit channel number from 00 to 31 (lead zero is important)

bb = buffer size from 1 to 32

mmm = mode byte value (0-255)

sss = ascii value of 'send' character (0-255)

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

rrrrr = the synthesizer R register value, (up to 16383)

(lead zero is irrelevant)

xxxxx = address

(up to 65535)

f_RF

433.900MHz

25kHz

f_TCXO

13MHz

PLT = N_TX

=

= 17356

R =

=

, So R=520

f_{Channelspacing}

f_{channelspacing}

25kHz

VHF PLT units have 10MHz, not 13MHz reference oscillators:

f_TCXO

10MHz

25kHz

R =

=

, So R=400 (for VHF PLT)

f_{channelspacing}

f_RF− 21.4MHz

433.900MHz − 21.4

PLR = N_RX

=

= 16500

f_{Channelspacing}

25kHz

Note: A pause of at least 50ms must be allowed between command strings (EEPROM programming time).

Radiometrix Ltd

PLT/PLR Data Sheet

page 7

Operating principle

On recieve, the FLOW output goes high at least 400uS (typically 480uS) before beginning of the start bit of

the first byte out

it goes low again 12uS after the end of the last byte stop-bit

This output can be polled, or used as an interrupt, to detect the arrival of a data byte (or bytes)

(tx measurements made on 32byte bursts, default mode 'send on buffer full)

On transmit, the FLOW output goes high 80uS after the end of the 32nd byte

(about 25-30mS after this point, the tx keys up and starts sending the burst)

it returns to low when the transmitter has ramped fully down

A 32 byte burst takes around 250mS to send, from first byte into tx, to last out of rx

(it's about 218mS from the start of the first byte in to the FLOW output returning low)

For a 32 byte burst, FLOW is high for about 185mS

Although such asynchronous operation is not really recommended (especially for timing-uncertain devices

like PCs, and especially when running high level languages and/or multiple applications), it is also possible

to send a 32 byte burst roughly every 225mS, for an aggregate throughput of about 140 bytes per second

(1400 baud)

(this is not the intended operating mode for the devices, but it does give an idea of the capabilities)

It would be much better (if maximum data rate was wanted) to send a (32byte) burst when the FLOW output

is low

The MODE byte

This is a value stored in EEPROM, that selects the various operating functions of the radio. Be careful. By

setting this incorrectly you can disable your radio link

Factory default (send when buffer full, clear buffer on exit from setup mode) is selected by MVALUE 0

Functions of the mode byte bits.

Bit0

Bit1

when zero the PLT will send when it's buffer is full

when zero the PLT clears the data buffer on exit from command mode

Bit2

Bit3

Bit4

Bit5

Bit6

Bit7

set:

send burst on entering command mode (if buffer has any data in it)

send burst on stop-bit over-run (ie: serial pin is low for more than 1.04mS)

clear data buffer on stop-bit over-run

send burst on receiving the character specified by SVALUE in the datastream

send burst if the gap following a character exceeds approx 4.2mS

reserved

Additionally, there are a few command mode characters that can be used :

>

<

send burst (if data is present in the buffer)

clear data buffer

Obviously:

bit 3 and bit 4 should not be set at the same time

bit 1 should be set if a command mode controlled send is used with a 'bouncy' CMD drive

(switch)

if bit 2 is set then it doesn't matter what bit 1 is doing !

Bit 6 (timeout mode) is best used with BVALUE 32 and other bits inactive

To generate a stop-bit over-run, either pull down the serial input pin for over 1.04mS (1 byte at `

9600 baud),

Or send a 00 (null, CTRL @ character ) at a slower baud rate

Radiometrix Ltd

PLT/PLR Data Sheet

page 8

Condensed specifications

Frequency

433MHz EU, 458MHz / 173MHz UK and 151MHz Australian bands

As supplied: EU version: 433.875 - 434.65MHz

UK version: 458.525 - 459.1MHz

173.200 - 173.325MHz

Australian version: 150.825 - 152.450MHz

And other custom VHF and UHF bands

Frequency stability

Channel spacing

Number of channels

1.5kHz

25kHz

32 (controlled via RS232 interface)

Operating temperature

Spurious radiations

-20 ºC to +55 ºC (Storage -30 ºC to +70 ºC)

Compliant with ETSI EN 300 220-3 and EN 301 489-3

Transmitter

Output power

+10dBm (10mW) 1dB (factory adjustable 1 - 25mW)

+20dBm (100mW) 1dB (factory adjustable 25 - 100mW)

3kHz

2.5kbps FSK (biphase) data stream

DC – 5kHz (3V CMOS compatible)

<-37dBm

Peak deviation

Modulation type

TX modulation bandwidth

Adjacent channel TX power

TX spurious

<-45dBm (no output in Standby)

Supply

Voltage

3.1V – 15V (1-25mW)

4.1 – 15V (25 – 100mW)

Current

35mA @ 10mW (nominal)

65mA @ 50mW (nominal)

100mA @ 100mW (nominal)

<9µA standby (TXE high or floating)

data (CMOS/TTL compatible)

33 x 23 x 9mm (BiM sized footprint, new pinout)

10 (8) pin 0.1" pitch dual row (5+5 or 4+4) header

2pin 0.1” pitch

Inputs

Size

Interface

User

RF

Recommended PCB hole size

1.2mm

Receiver

Sensitivity

AF bandwidth (-3dB)

-115dBm for <0.1% data errors)

4kHz

image

spurii / adjacent channel

blocking

LO re-radiation

Auxiliary outputs

Supply

<-60db

<-65db

- 84dB

-60dBm

RSSI, audio

Voltage

Current

3.1V – 15V

20mA receive

<1µA standby (RXE low)

46 x 23 x 9mm

Size

Interface

User

RF

Recommended PCB hole size

10 pin 0.1" pitch dual row (5+5) header

2pin 0.1” pitch

1.2mm

Radiometrix Ltd

PLT/PLR Data Sheet

page 9

RX Received Signal Strength Indicator (RSSI)

The PLR receiver has wide range RSSI that measures the strength of an incoming signal over a range of

60dB or more. This allows assessment of link quality and available margin and is useful when performing

range tests.

The output on pin 5b of the module has a standing DC bias of up to 0.5V with no signal, rising to 2.5V at

maximum indication (RF input levels of -40dBm and above). ∆Vmin-max is typically 2V and is largely

independent of standing bias variations. Output impedance is 40kΩ. Pin 5b can drive a 100µA meter directly,

for simple monitoring.

2.6

2.4

2.2

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

-140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40

RF level (dBm)

Figure 8: typical RSSI level with respect to received RF level at PLR antenna pin

Antenna requirements

Three types of integral antenna are recommended and approved for use with the module:

A) Whip

This is a wire, rod ,PCB track or combination connected directly to RF pin of the module.

Optimum total length is 16.4cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end well

away from metal components to prevent serious de-tuning. Whips are ground plane

sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and

plastic cased

B) Helical

Wire coil, connected directly to RF pin, open circuit at other end. This antenna is very

efficient given it’s small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the

wire length or expand the coil for optimum results. The helical de-tunes badly with proximity

to other conductive objects.

C) Loop

A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed

from RF pin at a point 20% from the ground end. Loops have high immunity to proximity de-

tuning.

Feature

A

whip

***

*

B

helical

**

***

C

loop

*

**

Ultimate performance

Easy of design set-up

Size

Immunity proximity effects

Range open ground to similar antenna

*

500m

**

200

***

100

Radiometrix Ltd

PLT/PLR Data Sheet

page 10

The antenna choice and position directly controls the system range. Keep it clear of other metal in the

system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is often

not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an internal

antenna must be used, try to keep it away from other metal components, particularly large ones like

transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the

antenna itself.

0.5 mm enameled copper wire

close wound on 3.2 mm diameter former

RF

433 MHz = 24 turns

A. Helical antenna

Feed point 15% to 25% of total loop length

track width = 1mm

RF-GND

2

4 to 10 cm inside area

C2

C1

RF

C3

C4

B. Loop antenna

16.4cm

wire, rod, PCB-track or a combination

of these three

RF

433 MHz = 16.4 cm total from RF pin.

C. Whip antenna

Figure 9: Antenna types (for 433MHz) band)

Ordering Information:

Part No.

VHF

Description Frequency band (MHz) Supply (V)

RF power (mW)

10

Data rate

PLT1-173-9

PLR1-173-9

PLT1-151-9

PLR1-151-9

Transmitter

Receiver

173.200 - 173.325

150.825 - 152.450

3.1 -15

4.1 -15

3.1 -15

9600bps

Transmitter

Receiver

100

UHF

9600bps

PLT2-433-9

PLR2-433-9

PLT2-458-9

PLR2-458-9

Transmitter

Receiver

Transmitter

Receiver

433.875-434.650

458.525 - 459.1

3.1 -15

4.1 -15

3.1 -15

10

100

Notes:

1. The standard products use a 9600 baud user interface speed. Slower versions are also available

(1200, 2400 and 4800 baud, with suffixes -1, -2, and -4). e.g.: PLT1-173-4 (for 4800 baud)

2. PLT/PLR are available on number of other VHF and UHF frequencies. Other UHF band frequencies

are subject to SAW filter availability. e.g. 315, 419, 429, 448, 465MHz etc

.

Radiometrix Ltd

PLT/PLR Data Sheet

page 11

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

Ofcom

Riverside House

2a Southwark Bridge Road

London SE1 9HA

Tel: +44 (0)300 123 3333 or 020 7981 3040

Fax: +44 (0)20 7981 3333

information.requests@ofcom.org.uk

European Communications Office (ECO)

Peblingehus

Nansensgade 19

DK 1366 Copenhagen

Tel. +45 33896300

Fax +45 33896330

ero@ero.dk

www.ero.dk


型号：	PLT
厂家：	RADIOMETRIX LTD
描述：	NBFM Multi channel Data Packet Link Radios NBFM多通道数据包链接收音机
文件：	总12页 (文件大小：459K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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