Aurel XTR-7020A-4 User guide

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

The XTR-7020A-4 is a 10 channel transceiver which compared with the XTR-903A-4, offers improved performance, as such as longer RF range, serial transmission speed and error checking. It has the same pin out. The data is transmitted in FSK modulation which assures a larger immunity to noise compared with amplitude modulation, allowing a range of more than 300 m in free air, by using omnidirectional antennas. The XTR-7020A-4 allows data transfer by TTL RS-232 logic by utilising a microcontroller which operates the redundance over the RF data.???? The speed of the data at the input serial port (9600-19200-38400 bps and 960057600-115200 bps according to S5 register setting) can be set through SP1 and SP2 pins. The data transmission is carried out according to store and forward technique: the data entered the serial port is memorized in a buffer and forwarded only at the end of their reception. During RF reception phase the bytes are memorized and transferred to the serial port only after checksum validation. In case of failure the whole lot is rejected. The data transmission delay (between input and output ports), depends upon packet length and speed of both serial connections. The high serial speeds (57600-115200bps) available, allows compensation of the introduced packaging delays: for instance a 64 Byte case, at a serial speed of 115200bps, the transmission delay shall be around 21ms, which is comparable, therefore, to XTR-903A-4. The maximum packet length is 240 Byte. By sending ‘AT’ type commands the communication channel, the serial speed and the outlet power can be selected and the RF channel occupation be monitored. The module is mechanicaly compact and maintains the same reduced dimensions of the XTR-903A-4 model (23 x 33 mm). The supply voltage is 3 Volt. The maximum power consumption is reduced to 10 µA. in stand-by condition

Features

 RS-232 signals store and forward operation  No code or preamble demanded to User  AT Commands for internal registers programming  HyperTerminal* compatible  Number of channels: 10  Compact dimensions (23x33 mm)  Bit rate: 9600, 19200, 38400, 57600, 115200 bps  Power transmitted: 10 mW max.  3v power supply  Typical range: 300 m

Applications

 Wireless handsfree

 House automation  Telemetry  Access control ???  Instruments monitoring  Data acquisition  POS terminals

* Trade Mark by Hilgraeve, Inc.

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

http://www.aurelwireless.com - email: [email protected]

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

Absolute limits

Operating temperature -20 °C ÷ +70 °C Storage temperature -40 °C ÷ +100 °C

Power supply +6V

Input voltage -1.0 ÷ Vcc + 0.3V Output voltage -1.0 ÷ Vcc + 0.3V

Technical features

Min. Typ. Max. Unit DC Levels

Supply voltage 2.7 3.3 3.6 V Power consumption (rx mode) 26 mA Power consumption (tx mode @ -8 dBm) 20 mA Power consumption (tx mode @ 10 dBm) 31 mA Power consumption (stand-by mode)

Logic level “1” in input/output 0.7xVcc Vcc V Logic level “0” in input/output 0 0.3xVcc V

Band 433.19÷434.57 MHz Modulation type FSK RX Sensibility (@115200 bps) -100 dBm TX Power -8 10 dBm

Performance

Serial Bit Rate Outdoor range 300 m Number of channels 10 Channel Spacing 153.6 kHz

Commutation times

PWRDN → RX TX → RX RX → TX

Default setting

Channel 433.96 MHz Output Power (tx) 10 dBm

As input serial signal is intended 8,n,1.

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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8 10

9600, 19200, 38400, 57600, 115200 bps

TBD ms

TBD TBD

µA

ms ms

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

Pins description

Pin Description

1,3

4, 5, 6, 7, 8

9,10,18

11,15

RF GND

ANT

GND

SP1, SP2

RSRX

485EN

XTR-7020A-4

Fig. 1: Device’s pinout

Connection with RF ground plane

Antenna connection, 50 ohm impedance

Not in use in this model

Connection to ground plane

Serial speed selection pins. The selection must be carried out before switching on the device

Serial data output with TTL RS-232 logic with 1 start bit (0V), 8 data bit and 1 stop bit (3V). The line must be driven at high logic level (3V)

The 485EN line allows to drive the RS-232 / RS-485 interface. In correspondence of the output data on the RSRX line, the signal reches a high logic level.

Jumper Serial speed

S1 S2 S5=0 S5=1 Open Close Close Open Open Open Close Close

38400 115200 19200 57600

9600 9600

Test Mode:

pseudonoise

Test Mode :

data packet

RSTX

PWRDN

Serial data input with TTL RS-232 logic with 1 start bit (0V), 8 data bit and 1 stop bit (3V). The line must be driven at high logic level.

Device state. In Power Down the transceiver XTR-7020A-4 goes off reducing the consumption to less than 10µA.

PWRDN STATE

0 On 1 Off

It is recommended not to leave the pin under a variable voltage if inactive, in order to prevent module’s malfunctionings

Vcc

Module’s supply (3V), duly filtered and adjusted.

Tab. 1: Pins description

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

http://www.aurelwireless.com - email: [email protected]

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

XTR-7020A-4 Operating mode

The device’s operating modes can be summarized in 6 conditions (Fig. 2):

1. Test Mode

2. Idle Mode

3. RF Transmit Mode

4. RF Receive Mode

5. Power Down Mode

6. Command Mode

1. Test Mode

The Test Mode can be reached by short circuiting pins SP1 and SP2 to ground, prior to switching on the device. According to S5 register containt, two different test modes can be obtained:

• S5=0: An RF continuous transmission of a carrier madulated by a 20 kHz signal composed by a

sequence of pseudorandom data.

• S5=1: Transmission of a data packet defined by a 4 digits incremental numerical value.

To exit such mode the supply must be cut off and a new configuration of SP1 and SP2 must be selected.

Test Mode

Power

Down Mode

Transmit

Mode

Idle

Mode

Command

Mode

Fig. 2 Operating modes

Receive

Mode

2. Idle Mode

It is the initial rest state of the device when is switched on (if SP1 and SP2 select the Test Mode): in such operating mode the transceiver waits the data reception from RF or from the RSTX serial line.

3. RF Transmit Mode

From the inactive condition (Idle Mode) the module switches to an RF transmission state, when on the RSTX input line (pin 14) is available a start bit (low logic level, 0V) and consequently at list one byte of data. The mechanism of data transfer Store & Forward may be described by pairs of operations in a sequence.

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------

Tel.: +39.0546.941124 Fax: +39.0546.941660

http://www.aurelwireless.com - email: [email protected]

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

 Unit A serial reception / Unit A RF transmission  Unit B RF reception / Unit B serial transmission [Fig. 3]

The lack of data at the XTR-7020A-4 module’s input is established by the expiring of a Timeout (determined according to the speed of the data serial). Once it is off, the transceiver does not memorize further incoming data until the RF transmission, of those already inside its reception buffer, is carried out. The data is transmitted through an RF channel only after the serial reception is over. In the same way the receiver analyzes the received packets from the RF, proceeding then with the serial transmission if the data is valid or discarding them if not correct.

As shown by the Fig. 3 time diagram, the time interval, from the starting moment (instant 0) when the data reaches the module’s port, to the moment when it is received by the remote module, is the function of the number of Bytes that form the packet and of the serial speeds used for the reception as well as for the transmission.

For the correct operation of the device consider that the phases contemporaneity??? inside the same unit is not allowed; for instance : the data that possibly has entered through serial port of unit A is not memorized in the input buffer if the same unit is in RF transmission phase. Same thing for unit B; it is not allowed to receive RF data while the previous bytes packet is under serial transmission.

Fig. 4 shows the case of the transmission of two packets in a sequence from unit A to unit B: packet #1 enters unit A and is transmitted to unit B that forwards it through the serial port. The transmission of the packet #2 must be carried out bearing in mind that the end of the serial reception of unit A has to take place AFTER the end of the serial transmission of packet #1 by unit B so to avoid the overlapping of the RF reception and of the serial transmission phases in this device: it is therefore necessary to enter a safety interval between the transmissions of the two packets in function of the number of byte of the first packet, of

Unit A serial reception

Unit A serial STORE

Unit A RF FORWARD

Unit A RF transmission

adiofrequency

Unit B RF reception

Fig. 3: Store & Forward mechanism

Valid packet from unit B and transmitted throu

Unit B serial transmission

h serial port

t [ms]

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

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Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

[

the serial speed of unit B and in function of the time required T for the transmission of the packet on the RF which depends upon the number of bytes of the packet and it is given by

[]

= 139.0

NKmsT ⋅

byteRF

with K=4,21 @9600bps, K=3,35 @19200bps, K=3,1 @38400 and 57600bps, K=2,8@115200bps.

The last byte of the second packet must enter unit A after unit B has ended the serial

transmission of the first packet .

Unit A serial reception packet #1

Packet #2 cannot enter unit A while the RF transmission of packet #1 is in

rogress.

Serial data cannot be sent to unit A while the RF transmission of the packet #1 is in progress.

Unit A RF transmission of packet #1

Fig. 4: Two data packets transmission

5. Power Down Mode

By bringing to high level (+3V) pin 16 (PWRDN), the device enters into a power saving state; the

consumption in fact is limited to less than 10 µA. In this mode, the transceiver can neither receive nor

transmit. It is necessary to commutate pin 16 to low level (0V) to bring it back to the normal operating state (Idle mode). In such a state the RSTX line must be maitained to the high logic level (+3V) to avoid a wrong data transmission when the module is switched on.

6. Command Mode (XTR-7020A-4 module programming)

The Command Mode state allows the Owner to configure the operating parameters of the device. The programming is carried out by means of ‘AT’ type commands sent to the RSTX line (pin 14) at the speed set by means of pins SP1 and SP2 (pin 11 and 15). The module’s answers shall be given on the RSRX line (pin

12). To enter Command Mode from Idle Mode it is necessary to send on the RSTX line (pin 14) a sequence of 3 consecutives ASCII characters ‘+’, i.e.: (+++). A module under Command Mode state is unabled to RF reception.

]

Unit A serial reception of packet #2

Unit B serial transmission of packet #1

t [ms]

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

http://www.aurelwireless.com - email: [email protected]

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

Available Registers and Commands

The commands that can be issued to XTR-7020A-4 module concern the reading and writing of the registers containing the operation setting of the device. The reading and writing of the configuration register and the sending of the commands to the module is carried out by entering the ’AT’ sequence before the command’s or register’s name. The 16 programmable registers (from S1 to S16) can be read or written according to their function.

S1 BAND

S2 CHANNEL

S3 POWER

S4 RFON

S5 SER

S15 VERSION

S16 (#) RSSI

* = default values

Command Name Function

WR WRITE

CC COMMAND

(#) Note on register S16 use

The reading of the S16 register implies the activation of an analysis procedure of the RF channel on which the module has been programmed. Such a routine lasts for about 200ms (prefixed). The analysis result is supplied at the end of the operation. No other operation should be carried out during such interval. The channel analysis can be utilized whether to verify if it is already occupied by an interfering source, or to verify the reception quality in case we intend to test the quality of an under planning connection. In this connection it is suggested to initialize an XTR-7020A-4 module under Test Mode, to shift it in the different points where the covering has to be

Operating band of the transceiver

Operating channel

Device’s output power level

It switches On or OFF the module’s transmission power

Selection of the serial speeds’ two benches

Code showing the firmware version

It supplies a digital indication of the power received level, with a gradual scale from 0 to 9

0 = 433-434 MHz * R

0 = 433,19 MHz 3 1 = 433,34 MHz 2 = 433,50 MHz 3 = 433,65 MHz 4 = 433,80 MHz 5 = 433,96 MHz * 6 = 434,11 MHz 7 = 434,27 MHz 8 = 434,42 MHz 9 = 434,57 MHz

0 = - 8 dBm 1 = - 2 dBm 2 = + 4 dBm 3 = + 10 dBm *

0 = Power RF ON * 1 = Power RF OFF

0= ‘slow’ bench* 1= ‘fast’ bench

Variable R

0 = Min power received 9 = Max power received

Writing of the registers’ values in EEPROM

Command Mode exit

Tab. 3: Commands

R/W

= Channel not to be used with max power

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

http://www.aurelwireless.com - email: [email protected]

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

analyzed and then monitor the quality of the radio signal received, by reading repeatedly the S16 register of an other XTR-7020A-4 unit, set on the same channel.

Answers to commands and operations on registers

Positive answer: OK<CR><LF>

Negative answer: <bl> ERROR<CR><LF>

Forbidden operation: <bl> NO ACCESS<CR><LF>

With <CR> Carriage Return, ASCII character 13; <LF> Line Feed, ASCII character 10; <bl> ASCII character 32.

Reading of a register

Syntax: ATSx<CR><LF> [x = 1, ...,16 register to be read]

Answer : value contained in the register if the command has been correctly issued

The registers’ value is returned, figure by figure, under ASCII value.

Example: ‘16’ is the sequence of ASCII codes 0x31,0x36, corresponding precisely to figure ‘1’ and ‘6’. Such interpretation procedure must be followed even for the writing of a register’s value.

Writing of a register

Syntax: ATSx=Y<CR><LF> [x = 2, 3, 4 register to be written,

Answer: as indicated to para ‘Answers to commands’ above

All values programmed in the registers cause a variation of the module’s operating conditions that will be lost once the device is switched off, unless they are saved in the EEPROM memory of the microcontroller by means of the relevant command ATWR: in such case the modified values shall be active also to subsequent switching on.

Command to save the registers’ value in EEPROM

Syntax: ATWR<CR><LF> Answer: as indicated to para ‘Answers to commands’ above

Exit command from Command Mode

Syntax: ATCC<CR><LF>

Answer: as indicated to para ‘Answers to commands’ above

followed by <CR><LF>.

y = value to be entered]

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

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PWRDN

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PRELIMINARY

XTR-7020A-4

Owner’s Manual

The exit from Command Mode, in absence of the ATCC command, takes place automatically after approx. 5 seconds of inactivity.

Operations

It is possible to chain several operations by mixing actions on one single register and writing or exit commands on a single command line through the operator <,>. In the following example the S3 register’s value is set to 2, the modification is saved and the programming function is quitted:

Example #1: Writing of a register and value save. Exit from Command Mode

ATS3=2,WR,CC <CR><LF>

OK<CR><LF>

As it can be seen from the example, the prefix AT is applied only for the first command of the line, while for the subsequents must be skipped. The commands chaining is possible only on one register at a time for writing operations; if carried out along with a reading command it will engender an error answer.

Example #2: Register reading attempt and exit from Command Mode

If it is attempted to enter the command ATS1,CC<CR><LF> it will be realized that is not possible and that the module will indicate an error when the coma is typed. The screen shall display what follows:

ATS1,<bl> ERROR<CR><LF>

The commands are not case sensitive therefore can be typed in upper or lower-case.

See Appendix A for further examples.

Application Examples

Fig. 5 shows a typical application of the XTR-7020A-4 connected to a microcontroller that, besides to receive and transmit data on the two input and output lines (RSTX and RSRX), it drives also the PWRDN.

1 RF GND 2

ntenna

3 RF GND

9 GND

XTR-7020A-4

GND 18

Vcc 17

SP2 15

TXD 14

RXD 12

GND 10

Microcontrolle

OUT PORT

N PORT

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Fig. 5: Example of a 9600 bps connection (SP1 and SP2 to Vcc) between a XTR-7020A-4 and a

microcontroller

Fig. 6 shows an example of connection between an XTR-7020A-4 module and the serial port of a PC: the integrated circuit interposed between the transceiver and the port, performs only the conversion function between the electrical levels of the RS-232 and the TTL logic. By means of the RTS signal (pin 7 of the DB9 port) it is possible to drive the PWRDN line, while the serial speed selection is fixed to 9600 bps.

1 RF GND

ntenna

3 RF GND

XTR-7020A-4

GND 18

Vcc 17

WRD

SP2 15

TXD 14

RXD 12

MAX-232

9 R2OUT

12 R1OUT

10 T2I

R1IN 13

9 GND

GND 10

DB9

Fig. 6: Example of the connection between an XTR-7020A-4 and the serial port RS-232 at 9600 bps (SP1

and SP2 to Vcc)

Standards of reference

The XTR-7020A-4 transceiver complies with European Standards EN 300 220, and EN 301 489. The tests are carried out transmitting and receiving Pseudo Random (CEPT 70-03) Codes. The occupation band is verified by using a Pseudo Random Code at 115200 bps. Besides, the product has been tested according to EN 60950 Standards and it is utilized inside a special isolated case which guarantees its compliance to the above mentioned Standards. The transceiver must be fed by a very low voltage and safety source protected against short circuits. The usage of the transceiver module is foreseen inside cases that guarantee the compliance to EN 61000-4-2 Standards not directly appliable to the module itself. In particular, is left to user’s care the isolation of the connection to the outdoor antenna and of the antenna itself since the RF output of the receiver is not in the position to directly bear the electrostatic charges foreseen by the a.m. standards.

CEPT 70-03 Reccommendation

The XTR-7020A-4 transceiver operates in a harmonized frequency band therefore, in order to comply with the current regulations; the device must be utilized in the time scale, for a maximum hourly duty-cycle of 10% (equal to 6 minutes of use over 60).

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------

Tel.: +39.0546.941124 Fax: +39.0546.941660

http://www.aurelwireless.com - email: [email protected]

Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

XTR-7020A-4

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The antenna suggested solution (loop antenna) guarantees the compliance with the regulation concerning the irradiated power.

echanical dimensions

XTR-7020A-4

Fig. 7: Mechanical dimensions

Appendix A – More examples of operations with registers

Example #3: reading of the module’s operating band

+++OK <CR><LF> ATS1 <CR><LF> 0 <CR><LF> [0= 433-434 MHz band]

Example #4: variation of the module’s operating band

+++OK <CR><LF> ATS1=2 <CR<LF> <bl> NO ACCESS<CR><LF>

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

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Dec. 20 th 2005AUR°EL S.p.A. Via Foro dei Tigli, 4 - 47015 Modigliana (FC) – ITALY

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PRELIMINARY

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Syntax error: the S1 register is available for reading only

Example #5: Channel reading

+++OK <CR><LF> ATS2 <CR><LF> 2 <CR><LF> [2= 433.5 MHz channel]

Example #6: Channel selection

+++OK <CR><LF> ATS2=8 <CR><LF> [8= 434,42 MHz channel] OK <CR><LF>

Example #7: Output power reding

+++OK <CR><LF> ATS3 <CR><LF> 1 <CR><LF> [1= power –2dBm]

Example #8: Output power selection

+++OK <CR><LF> ATS2=3 <CR><LF> [3= power +10dBm] OK <CR><LF>

Example #9: Reading of the received signal

+++OK <CR><LF> ATS16 <CR><LF> 9 <CR><LF> [9 = busy channel, maximum received power]

Example #10: Reading of the received signal

+++OK <CR><LF> ATS16 <CR><LF> 0 <CR><LF> [free channel, minimum received power]

Technical specifications may be changed without notice. AUR°EL S.p.A. declines all responsabilities deriving from a wrong utilisation of the equipment.

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Tel.: +39.0546.941124 Fax: +39.0546.941660

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