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FIGURE 4 STATION ADDRESSING

6.8.3 Global Addressing

The base station can send the same data to all the modems by using the Global Address 00
(Fig 5). The following instruction would be inserted before the data by the base station host:

ATT00

FIGURE 5 GLOBAL ADDRESSING

Summary of Contents for X7200

Page 1: ...ELESS WARWICK WIRELESS LIMITED LIMITED LIMITED LIMITED X7200 X7200HP SYNTHESISED RADIO MODEM WARWICK WIRELESS LIMITED THE MANOR ASTON FLAMVILLE LEICESTERSHIRE LE10 3AQ ENGLAND TEL 44 0 1455 233616 FAX 44 0 1455 233179 WEB www radiotelemetry co uk ...

Page 2: ...g 6 4 Parity On Off 6 5 Odd or Even Parity 6 6 Repeater Modes 6 6 1 Open Repeater Echo back mode 6 6 2 Chain Repeater 6 7 Error Correction 6 8 Address Modes 6 8 1 Basic configuration 6 8 2 Station addressing 6 8 3 Global addressing 6 9 RF Channel 6 10 Transmitter Key 6 10 1 RF power output 6 10 2 ERP and SWR 6 10 3 Antenna alignment 6 10 4 Site surveys 6 11 Transmission Speed 7 0 RADIO TRANSMISSIO...

Page 3: ...8 0 TROUBLE SHOOTING 8 1 No Data Transmission 8 2 No Data Reception 8 3 Corrupt Data 8 4 Radio Path 8 5 Help Line Number 9 0 WARNING ...

Page 4: ...ncryption and data packet retries The over air data speed can be configured at either 5K bits sec or 10K bits sec This is independent of the baud rate and should be set to a lower value were possible for the best results All the parameters on the X7200 radio modem can be set by an internal menu selected by connecting pin 6 on the 9 way D Connector to 0v or typing ESC directly after the power has b...

Page 5: ...by an internal resetable fuse The modem is housed in a robust lightweight aluminium enclosure measuring 114mm by 65mm by 26 mm Additional options include X7201 12V power supply X7202 PC to Modem cable X7204 IP67 enclosure X7205 Leather carrying case X7206 Belt mounted battery packs X7207 600 ohm line interface module 2 0 SPECIFICATION 2 1 Radio RF Frequency 400MHz 480MHz RF Power X7400 5mW X7200 5...

Page 6: ...causing interference to the received signal PIN 2 RD Receive serial data from host PIN 3 TD Transmit serial data to host PIN 4 DTR A signal of between 0v to 15v will switch the modem into standby power mode The input has an impedance of 22Kohms Open circuit for normal operation PIN 5 OV Power supply and common for host PIN 6 CON Configuration input Connecting 0V to this input will send the configu...

Page 7: ...ransmit a repeater command byte if set and a transmitter address byte followed by the data that has been placed in the buffer memory The transmission is terminated when a gap of two data bytes is detected in the incoming data stream If more data is sent after a gap of two data bytes then the above sequence will be repeated When the receiving modem detects the presence of incoming data it takes CTS...

Page 8: ...Windows Terminal Data Talk or any other terminal package with the following settings 9600 Baud No Parity 1 Stop Bit Local Echo XON XOFF to OFF RTS CTS to OFF no handshaking Connect up a second modem in the same way Pressing a key on one PC will transmit the character to the other Refer to the Section 8 0 Trouble Shooting if this does not happen If a second PC is not available simply power up the s...

Page 9: ...cted the following will appear on the screen WARWICK IND ELEC X7200 MODEM BAUD PARY O E REPT ERR DDR TXAD RXAD RFC TXON FX B N O N N N OO OO Q N F Y N 6 2 Configuration by Terminal Access If the current configuration is known then the modem can be configured without the use of a link between pin 6 and 0V Connect a dumb terminal to the D connector with the same baud rate and parity as that already ...

Page 10: ... set the hosts at both ends to 7 bits plus a parity bit This will then transmit data plus parity over air 6 5 Odd or Even Parity O E If parity is required either O for Odd or E for Even parity must be entered next A letter must be entered to proceed to the next setting 6 6 Repeater Mode REPT A modem can be set in two different repeater modes by typing Y 6 6 1 Open Repeater Echo Back Mode Any trans...

Page 11: ... 22 33 TRANS ADD 33 22 33 22 The repeating modems can be used to send and receive data via their serial ports Alternatively they can be stand alone units just with power connected to them FIGURE 3 REPEATER MODE 6 7 Error Correction Mode ERR By selecting this option with a Y a forward error correcting algorithm is brought into operation Redundant data bits are then inserted in the transmitted data ...

Page 12: ... is selected two modems with the following address will pass data to their Hosts TXAD Modem 1 RXAD Modem 2 RXAD Modem 1 TXAD Modem 2 No other modems in the network will be able to communicate with them This is useful for high security data is transfer 6 8 2 Station Addressing The ATRnn and ATTnn instruction can be used to dial up distant modems as shown in fig 4 The base station modern has its rec...

Page 13: ... 3 Global Addressing The base station can send the same data to all the modems by using the Global Address 00 Fig 5 The following instruction would be inserted before the data by the base station host ATT00 FIGURE 5 GLOBAL ADDRESSING ...

Page 14: ...MPT1329 licence except band Some of this power is lost in the coaxial cable between the radio modem and the antenna It is possible to compensate for feeder losses by using a high gain directional Yagi antenna Care must be taken not to transmit more than 500mW therefore the RF power must be reduced to compensate for the gain of the antenna minus the losses of the antenna feeder The RF power potenti...

Page 15: ...W 7 173 000MHZ 1W 8 173 175MHZ 5W 9 173 150MHZ 5W A 173 125MHZ 5W B 173 100MHZ 5W C 173 075MHZ 5W D 173 050MHZ 5W E 173 025MHZ 5W F 173 000MHZ 5W 7 3 Radio Propagation When installing a X7200 Radio Modem there are a number of factors that should be considered as they will affect the performance of the radio link These are Transmitter power output Sensitivity of the receiver Height of transmitter a...

Page 16: ... of reducing the overall power consumed by the transmitter without effecting the range in the direction of orientation It also reduces interference from other users The receiver signal is also amplified if a Yagi antenna is used thereby extended range in the direction of orientation to around 20 Km line of sight 8 0 TROUBLE SHOOTING 8 1 No Data Transmission Check that TD and RD are connected to th...

Page 17: ...upted Data Corrupted data can be caused by poor power supplies Check that the power supply is regulated at 12V and has a ripple of less than 50mV on load It must also be capable of delivering an inrush current of 0 7Amps for 20mSec when the radio modem starts its transmit cycle The ripple voltage can be measured with a voltmeter set on A C volts 8 4 Radio Path The radio path can be tested by confi...

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