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SATELLINE-2ASxE

User Guide, Version 2.0

20

5.5 A system with several repeater stations

f1

f1

PWR

PWR

f1

BASE STATION

SUB STATION

R1

R2

In systems with several adjacent or parallel repeater stations addresses should be used. This
prevents messages from circulating around the network and ensures that only a determined radio
modem receives the message.

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Summary of Contents for SATELLINE-2ASxE

Page 1: ...SATELLINE 2ASxE RADIO MODEM User Guide Versio 2 0...

Page 2: ...ormation at their disposal is valid SATEL software and programs are delivered as is The manufacturer does not grant any kind of warranty including guarantees on suitability and applicability to a cert...

Page 3: ...specific permit SATELLINE 2ASxE 370 470 MHz is allowed to be used in the following countries either on licence free channels or on channels where the operation requires a licence More detailed informa...

Page 4: ...mance electromagnetic compatibility and electrical safety and other relevant provisions of Directive 1999 5 EC Therefore the equipment is labelled with the following CE marking The notification sign i...

Page 5: ...Transmission and Data Speed 14 3 1 Asynchronous character 14 3 1 1 Special BREAK Character 15 3 2 Data speed 15 4 Repeater Station Using One Radio Modem 15 5 Using Addresses in Data Communication 16 5...

Page 6: ...Setting the radio channel 31 7 3 3 Saving of the current setup 32 8 Forming the SL Commands 33 8 1 Forming a packet to change addresses 33 9 Multi Modem Data Systems 35 9 1 Transmission sequences 35 9...

Page 7: ...The most important RS 232 signals are indicated by LEDs Typical applications of the SATELLINE 2ASxE are x Replacing an RS 232 cable in situations where installation of a cable is difficult expensive o...

Page 8: ...asily change the frequency for communication with the different base stations By using this method the coverage area of a system can be enlarged without incurring extra delays due to the capacity of t...

Page 9: ...to accept data on the TD line 7 8 GND Ground Operating voltage negative pole and ground reference for all signals 9 RD OUT RS 232 Receive Data 10 DSR OUT RS 232 Data Set Ready Indicates the ON state...

Page 10: ...ng to ETS 300 113 Receiver Sensitivity 115 dBm BER 10 E 3 Co channel rejection 8 dB Adjacent channel selectivity 60 dB 70 dB or 70 dB Intermodulation attenuation 65 dB Spurious radiations 2 nW DATA MO...

Page 11: ...n 1 Transmission based on CTS or CD handshaking 2 Data connected directly to the TD line 3 Using TX control of RTS line If the connection between the radio data modems breaks in the middle of the tran...

Page 12: ...mission 2 2 Reception The SATELLINE 2ASxE is ready to receive data within 300 ms after the power supply is switched on and the DTR line is in the ON state Data appears on the RD line as soon as the mo...

Page 13: ...Delays during data transmission When using a radio data modem certain delays occur in data transmission and reception The delays at different data speeds are 1200 bps 2400 bps 4800 bps 9600 bps Wakeu...

Page 14: ...7 1 15 8 Vb GND RADIOMODEM FUSE630mAslow TD RD 2 3 7 25 PIND CONNECTOR SGND TD RD 2 3 5 9 PIND CONNECTOR SGND SATEL OY Salo Finland tel 358 2 7777800 SATELLINE 2ASxE SW Version 1 00 Center Frequency 4...

Page 15: ...onous character The asynchronous data characters are in accordance with the ANSI standard e g ASCII and according to the length of the character are divided into two groups The character length is 10...

Page 16: ...ion has to be set on in the programming mode In the repeater mode the radio modem works as an independent unit When a radio modem is only used as a repeater it only requires a power supply and an ante...

Page 17: ...dary addresses are normally useful only if the radio modem is used as a repeater The addresses can be selected separately for both directions It is also possible to transfer the received address to th...

Page 18: ...of the radio modem are different from the address of the received data packet Data does not appear on the RS 232 interface Data Data Data Address Data Address Data E R R O R Fig 5 Reception addressing...

Page 19: ...and in this case the feature of the radio modem is not needed The address of the base station can always be changed when transmitting from one substation to another In this case the base station can o...

Page 20: ...ses of a pair of radio modems When neither the terminal nor the substations are able to generate address fields but they can recognize the message addressed to them the addresses of the radio modems c...

Page 21: ...tions f1 f1 P W R P W R f1 BAS E STATIO N S UB S TATIO N R 1 R 2 In systems with several adjacent or parallel repeater stations addresses should be used This prevents messages from circulating around...

Page 22: ...rom the base station terminal contains the addresses of the repeater stations and the substation each box consists of two characters R2 ADD S ADD DATA the message from the repeater station 1 to repeat...

Page 23: ...except when a packet with the secondary reception address RX2 is received and the repeater mode is turned on In this case secondary transmission address TX2 is used instead In the following example t...

Page 24: ...s the Test Mode To exit the Test Mode put pin 12 to ground GND before switching the power on In the Programming Mode the Test Mode can be disabled again Normal data transmission is not possible in the...

Page 25: ...Programming Mode Settings of the serial port are those set at the Programming Mode With this function the features of SATELLINE 2ASxE can be changed in the way described in chapter 7 3 7 2 Programming...

Page 26: ...t responsible for any illegal use of its radio equipment 7 2 2 Setting the channel spacing The desired channel spacing can be selected in menu 2 The channel spacing can be selected between 20 and 12 5...

Page 27: ...eed is 9600 bps If the channel spacing is 12 5 or 20 kHz the maximum data speed is 4800 bps 1 Data Speed 9600 bps 2 Character Length 10 bits Enter selection or ESC to cancel 1 1 1200 bps 2 2400 bps 3...

Page 28: ...in transmitting and receiving In case a communication between two radio data modems is wished to be established with addresses they only communicate with each other the same address must be set in bot...

Page 29: ...the reception it directly transmits the received and memorized data on the same channel and with the same settings as received If addressing is used the message is retransmitted with the TX address c...

Page 30: ...rrupted The radio modem goes out of reception the CTS line indicates current status and the TD line is ready for use 7 2 9 Setting the special functions Some special functions can be set in menu 9 x B...

Page 31: ...em waits for a given time between the first character to be transmitted and the beginning of the actual transmission During this period any data to be transmitted is stored in the 135 B long data buff...

Page 32: ...s The length of the programming packet should be 5 characters and the length of the pause before and after the programming packet must exceed 3 characters 7 3 1 Setting the addresses All the four addr...

Page 33: ...SLH35 445 MHz 35 25 kHz 445 875 MHz As soon as the radio modem recognizes a channel programming packet it disables the CTS signal and checks if the setting of the new channel is permitted If the new c...

Page 34: ...ng a packet to change addresses If you want to use e g address 2B5A hex start by converting the hex value to characters This can be done by using a map of characters to convert the numbers Appendix1 T...

Page 35: ...y together with the numeric keypad Use a simple DOS editor Press ALT key use the numeric keypad to enter the decimal value 3 numbers e g 10 010 and release the ALT key e g Hex address typing of the co...

Page 36: ...ve network which allows one radio modem to control the others in the system Slave units can communicate with the Master during the time allocated to a particular Slave by the Master unit The advantage...

Page 37: ...distances may require that at least one of the antennas is raised to a height of 10 to 20 m If the antenna cable is more than 10 meters long it is necessary to use a low loss cable 0 7 dB 10m in order...

Page 38: ...e has different environmental and external factors to another and that the effects on transmission quality must be taken into account when planning the system Ground ground contours and buildings caus...

Page 39: ...th the radio modem 3 By mounting the radio modem directly on the customer s equipment NOTE When choosing the place for mounting please check that water can not get inside the radio modem It is not rec...

Page 40: ...D RTS CTS CD 2 3 4 5 7 8 25 PIN D CONNECTOR DTR 20 DSR 6 SGND TD RD RTS CTS CD 2 3 5 1 7 8 9 PIN D CONNECTOR DTR 4 DSR 6 SGND In some systems the radio modem is connected to another Data Transmission...

Page 41: ...ted connectors Since connectors of poor quality oxidize and increase the attenuation in the course of time appropriate connectors and proper tools must always be used One should also check that both t...

Page 42: ...is built on the reflection and or the knife edge diffraction the path loss can vary even 20 dB depending on the weather conditions In this case a short test can give a too positive result of the qual...

Page 43: ...ment yagis in firm external installations As the antenna amplification increases the setting of the direction of the antenna demands for a greater care The base stations in high places should be suppl...

Page 44: ...ns a 1 2 wave antenna is the most suitable It can be mounted at the top of a pipe as this provides it with as much open space as possible In places where the antenna cannot be connected directly to th...

Page 45: ...RS 232 cable is 15 m The cable must be shielded The maximum length of the power supply cable is 2 m As standard cables we supply cables with either a 25 pin connector CRS 1 F or CRS 1 M F female M mal...

Page 46: ...le from any source of interference Do not place the modem on a strongly vibrating surface Do not place the modem in direct sun light or high humidity 3 The capacity and stability of the power supply m...

Page 47: ...SATELLINE 2ASxE User Guide Version 2 0 46 Appendix 1 Character Map...

Page 48: ...ODEM 1 MODEM 2 t0 17 20 ms typ 18 ms delay between TD and RD data t1 1 5 4 ms Tx on Rx CD delay t2 5 6 ms Tx on Rx CTS delay t3 2 10 ms typ 3 ms Data package end delay t4 5 60 ms typ 30 ms Tx buffers...

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