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ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 1 synthesised radio modem x8200 X8200HP ? operates on international licensed and licence fre e radio bands ? rf bands: o 147mhz to 174mhz vhf o 400mhz to 500mhz uhf o 868mhz to 920mhz uhf ? conforms to etsi 300-220, etsi 300-113, etsi 300-6 83, mpt1329, mpt1411 ? distant modems can be monitored and configured ove r the radio link ? 17 to 99 selectable radio channels ? range (500mw): o 10km to 20km line of sight o 1km to 3km in buildings ? rs232 & rs485 serial interface ? baud rates of 1.2k to 115.2k ? commissioning and diagnostic futures ? store and forward repeater mode to extend range ? addressable individually and globally ? on-line at commands ? packetised data, and forward error correction opti ons ? low power standby mode description the x8200 radio modem transmits and receives half d uplex serial data at baud rates of 1.2k to 115.2k b y means of a fm radio transceiver operating on the uk and europe an licence exempt bands and most other world wide d ata frequencies. a 4k buffer memory is provided so that data can be passed asynchronously between the host and modem wi thout the need for handshaking. the cts output signal can be used for flow control in duplex applications. the o ver air data speed can be configured at either 5k bits/sec or 10 k bits/sec. this is independent of the baud rate an d should be set to a lower value where possible for the best radio pro pagation. the set up menu of the x8200 can be accessed either by a pc running any terminal emulation program lik e hyper terminal in the accessories section or remotely ove r the radio link. the set up menu is selected eithe r by connecting pin 6 on the 9 way d connector to 0v or typing $ then e sc directly after the power has been applied. the m enu configuration is permanently stored on eeprom. on-line ?at? commands can be sent to the modem to c hange the address configuration, repeater path or r f frequency during normal operation so that any modem can ?dial up? any other modem on the network. data can be formed into packets and passed from one modem to another. if the received packet has error s detected then the data will automatically be sent again. bot h size of the data packet and the number of retries can be set in the menu.
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 2 synthesised radio modem x8200 X8200HP index 1 specification .................................... ................................................... ..........3 1.1 mechanical and environmental ................... ...........................................3 2 connections ...................................... ................................................... .........4 2.1 9 way d type connector rs232/rs485 ............. ..................................4 2.2 led indicators................................. ................................................... ....5 2.3 antenna connector .............................. ................................................... 5 3 operation ........................................ ................................................... ...........5 4 getting started.................................. ................................................... ..........5 4.1 basic connection ............................... ................................................... ..5 4.2 power connection............................... ................................................... .5 4.3 factory setting................................ ................................................... .....6 4.4 plug and play .................................. ................................................... .....6 5 configuration.................................... ................................................... .........7 5.1 access configuration menu ...................... .............................................7 5.2 configuration menu............................. ................................................... 8 6 radio transmission ............................... ................................................... ..16 7 trouble shooting................................. ................................................... .....18
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 3 synthesised radio modem x8200 X8200HP 1 specification electrical characteristics min typical max dimensio n note frequency range 868 920 mhz 458.500 458.950 mhz uk 400.000 480.000 mhz world 147.000 174.000 mhz si (x8200 hp only) channels 127 channel separation 12.5 25.0 25.0 khz start up time 5.0 10.0 30.0 msecs with $ selected modulation f3d, f1d 10 12 26 vdc power supply x8200 X8200HP 10 12 14 vdc baud rate 1.2 115.2 kb/s transmitter rf power x8200 5 500 mw rf power X8200HP 1 5 w data input rs232 -10 10 v data input rs485 0 5 v frequency deviation +/- 3.0 khz 25khz channel modulation rate dc 10.0 kbps supply current x8200 X8200HP 340 1800 ma receiver if frequencies 45/455 mhz sensitivity 0.9 v bandwidth +/- 7.5 khz data output rs232 -10 10 v data output rs485 0 5 v carrier detect -10 10 v supply current x8200 X8200HP 90 150 ma supply current standby 0.005 0.007 0.01 ma 1.1 mechanical and environmental dimensions x8200 uhf 800mw length = 140mm width = 65mm height = 26mm dimensions X8200HP uhf 5w length = 147mm width = 65mm height = 52mm dimensions X8200HP vhf 5w length = 174mm width = 80mm height = 58mm operating temperature range -10 to +55 deg c
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 4 synthesised radio modem x8200 X8200HP 2 connections 2.1 9 way d type connector rs232/rs485 1 +ve power input 6 configuration mode input 2 rs232 rd receive data input 7 -ve rs485 input/output 3 rs232 td transmit data output 8 cts output 4 dtr (standby) input 9 +ve rs485 input/output 5 0v input pin connection description 1 +ve regulated power supply. it is not advisable t o use some types of switched mode power supply either to drive the x8200 radio modem or in close proximity to it. this type of power supply can produce high energy radio frequencies ov er a broad spectrum thereby causing interference to the received signal. 2 rd rs232 receive serial data from host 3 td rs232 transmit serial data to host 4 dtr a signal of between 0v to ?7v will switch the modem into standby power mode. leave open circuit for normal use 5 gnd power supply and common for host. 6 con configuration input. connecting 0v to this in put will send the configuration menu to the host when the power is applied. it is left open cir cuit for normal operation 7 ?ve rs485 bi-directional data. 8 cts brought low by the modem when a rf carrier is detected or the receiver buffer memory is full. this can be connected to rts on the host to i nhibit data from the host in duplex operations. 9 +ve rs485 bi-directional data.
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 5 synthesised radio modem x8200 X8200HP 2.2 led indicators three leds on the front of the modem indicate the following states: tx green on when modem is transmitting data. rx green on when a rf carrier of greater than 0.9u v is detected by the modem. power red on when power is applied to the modem 2.3 antenna connector bnc/tnc 3 operation a transmission is started by sending data to rd (pi n 2) or the rs485 terminals (pin7 & 9).the radio mo dem places this data in the transmitter buffer memory while it checks to see if the rf channel is free. if it is not then the data is stored in the buffer until the channel becomes free . if it is free then a preamble message will be tra nsmitted so that the receiving modems can align to the incoming data . when tx priority is set, data will be transmitted regardless of the condition of the rf channel. the modem will then transmit a command byte which w ill instruct the distant modems to perform the func tions set in the menu followed by the addressing and repeater fu nctions. the data that has been placed in the buffe r memory will then be transmitted. the transmission is terminated when a gap of two data bytes is detected in the in coming 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 in coming data it takes cts (pin 8) low. the repeater command byte is decoded and the transmitter address compare d to the receiver address. if they are the same or if the global address of 00 is decoded or if the address mode is switched off then the data will be presented at the serial output port td (pin 3). at the end of the message cts is t aken high. if the packetisation option is selected the receivi ng modem will check the crc byte. if it is correct an ack sent to the transmitting modem. if the crc is incorrect a nack is sent to the transmitting modem and the data is s ent again. the number of re-trys are set in the menu. if the repeater command is decoded or the repeater mode set in the configuration menu then the data wi ll be stored and then re-transmitted. 4 getting started 4.1 basic connection transmit (td) on host to receive (rd) on modem pin 2 receive (rd) on host to transmit (td) on modem pin 3 ground (0v) on host to 0v on modem pin 5 4.2 power connection pin 1 = positive pin 5 = gnd
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 6 synthesised radio modem x8200 X8200HP 4.3 factory setting the radio modem is supplied with the following set tings: 4.4 plug and play connect three wires to the rs232 serial port of the host terminal (0v, td and rd) as described above. connect a regulated power supply to the radio modem. x7202 pc to modem cables can be used along with a x7201 power s upply. configure a pc to hyperterminal in the accessories section to the following: go to file and then t properties . set the configuration to : 9600 baud no parity 1 stop bit xon/xoff to off rts/cts to off (no handshaking) settings should be: terminal keys set emulation set to ansi ascii set up : deselect all. connect up a second modem in the same way. pressing a key on one pc will transmit the characte r to the other. refer to the section 8.0 trouble shooting if this does not happen. x8200 radio modem v#.# advanced menu y modem id 01 baud 9600 parity n odd/even e rf power 5 key transmitter n rf channel 17 rssi n sensitivity 00 comms speed s address mode n enable at instr n restore defaults n exit without save n save & exit n advanced menu return to main menu y message tag 0000 tx priority n fec n packetise data n number of retries 05 packet size 20 logger mode n enable remote access y access remote modem n engage repeater path n set repeater path 00 m01 m02 m03 m04 m05 m06 ---- m16
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 7 synthesised radio modem x8200 X8200HP if a second pc is not available simply power up the second modem. configure the id numbers and the enable remote access option on both . then use the access remote modem option to display the menu of the remote mode m. fig 1 shows how an open network using the above con figuration would work. all the data transmitted from one modem will be received by all of the others. this is similar to an rs485 network but instead of connecting the equipme nt by wire a radio modem is used. figure 1 open network 5 configuration 5.1 access configuration menu there are three ways the menu can be accessed: typing $ then pressing the esc key as the first two characters after the radio modems has been switched on. connecting pin 6 on the d-connector to 0v on pin 5. then switching the radio modem on. using the remote access feature to display the menu of a distant radio modem. a pc configured as a dumb terminal with the followi ng settings should be used: 9600 baud no parity 1 stop bit echo off
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 8 synthesised radio modem x8200 X8200HP xon/xoff to off rts/cts to off (no handshaking) 5.2 configuration menu the vertical and horizontal arrow keys are used to move around the menu. alternatively the numbers keys 2, 4, 6 and 8 can also be used as follows: down arrow key or 2 key will move the cursor down the menu left arrow key or 4 key will reduce the value right arrow key or 6 key will increase the value up arrow key or 8 key will move the cursor up the menu the enter key is used in the following function: restore defaults exit without save save & exit access remote modem set repeater path the space bar key is used to delete modem id number s in the repeater path to save any changes made in the menu : move the cursor to save & exit, use the horizontal arrow key to select y . press the enter key the configuration menu shown below will be displaye d when a radio modem with modem id set to 01 remotely accessed a radio modem with modem id set t o 02. x8200 radio modem v#.# local remote advanced menu n n modem id 01 02 baud 9600 9600 parity n n odd/even e e rf power 5 5 key transmitter n n rf channel 17 17 rssi n n sensitivity 00 00 comms speed s s address mode n n enable at instr n n restore defaults n n exit without save n n save & exit n n advanced menu local remote return to main menu n n message tag 0000 0000 tx priority n n fec n n packetise data n n number of retries 05 05 packet size 20 20 logger mode n n enable remote access y y access remote modem y n engage repeater path n n set repeater path 02 00 local m01 m02 m03 m04 m05 m06 ---- m16 02 remote m01 m02 m03 m04 m05 m06 ----- m16 ( use space bar to delete repeater path )
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 9 synthesised radio modem x8200 X8200HP advanced menu: display advanced menu . return to main menu display main menu. modem id user defined id number. baud baud rate 1.2k to 115.2k tx priority data t ransmitted priority parity enable parity. message tag adds ident. no. to data odd/even select parity. fec forward error corr ection rf power set level of rf power. key transmitter switch on transmitter packetise da ta data is formed into packets rf channel set rf frequency. with error detecti ons and rssi bar graph of rx signal acknowledgments. c onnect sensitivity set the receiver sensitivity cts to rts on host. comms speed slow/fast numb er of retries sets number of retries. address mode enables modem address. packet size s ets packet size. 64-1024 at enable at instr at instruction are enabled. lo gger mode data is stored until polled. enable remote access allows distant modem to restore defaults set factory defaults. change s ettings. exit without save return without saving access rem ote modem displays settings of remote operation without saving modem with id on at pa th. settings. engage repeater path enable repeater p ath. save & exit return to modem and save set repeater path sets at path m01 to m16. settings. advanced menu the horizontal arrows are used to select the advanc ed menu. modem id number each modem in a network can be given an individual id number between 0 and 99 this is used for: remote access menu modem addressing repeater function packet data function baud rate settings a baud rate is entered by moving the cursor under t he current setting with the vertical arrow keys. then by pressing the horizontal keys the val ue will change: baud rate 115.2k 57.6k 38.4k 19.2k 9.6k 4.8k 2.4k 1.2k parity on/off
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 10 synthesised radio modem x8200 X8200HP if a parity bit is required use the horizontal arr ow key to select y the parity bit is only used between the host and th e radio modem odd or even parity o/e if parity is required either o for odd or e for ev en parity can be set by pressing the horizontal arrow keys. rf power the rf output power can set using a number between 1 minimum and 5 maximum. the horizontal arrow keys are used to change the value . rf channel the radio frequency can be set by using a number be tween 1 and 17. if channel 0 is selected the radio will use the dil switch settings to select the rf frequency rf dil switch (used when rf ch is set to 0) channel frequency sw5 sw4 sw3 sw2 sw1 1 458.525 on on on on off 2 458.550 on on on off on 3 458.575 on on on off off 4 458.600 on on off on on 5 458.625 on on off on off 6 458.650 on on off off on 7 458.675 on on off off off 8 458.700 on off on on on 9 458.725 on off on on off 10 458.750 on off on off on 11 458.775 on off on off off 12 458.800 on off off on on 13 458.825 on off off on off 14 458.850 on off off off on 15 458.875 on off off off off 16 458.900 off on on on on 17 458.925 off on on on off in addition an atx instruction can be used to chang e the rf frequency form the serial port. for example to change the rf frequency to channel 0 9 the instruction would be: a t x 0 9 41 54 58 30 39 were the channel number is sent as two ascii number characters 30-39 for 0-9
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 11 synthesised radio modem x8200 X8200HP
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 12 synthesised radio modem x8200 X8200HP key transmitter the key transmitter setting switches on the transmi tter so that a radio site survey can be conducted. . a second radio modem can be used to m ove around the site observing either the rx led or the rssi bar graph. if the rx led is on or there are more than 3 bars on the rssi bar graph then there will be good communicatio ns. rssi relative signal strength indicator the rssi function is used to detect radio activity on the rf channel. it can also be used to measure the signal strength of a transmission from a distant radio modem. a maximum of nine bars will appear relating to a si gnal strength of 0.3uv (-112dbm) to in the remote access mode the distant modem will me asure its own rssi and radio the value back to the local radio modem were it will be displ ayed on a bar graph in the menu. comms speed two over air transmissions speeds can be selected. these are: f = 10kbits/sec s = 5kbits/sec address mode the address mode uses id numbers to ?dial up? dista nt modems. when the data is transmitted from a distant modem the first id number set in the repeater path is added to the data string and used as a transmitter address. the receiving mo dem compares the transmitter id in the data string with its own id number. if they are the same the data string is passed to the serial port. in addition individual modems can be dialled up by using serial att and ata instructions to change the transmitting id number. the att instruction can be used to ? dial up? distant modems as shown in fig 4. the base station modern has its id number (receiver address rxa) set to 01. the four distant stations have id numbers 2,3,4 and 5. all of the distant mod ems have the first value in their repeater path (transmitter address txa) set to 01. therefore any distant modem can transmit data to the base station but not to each other. the serial att instruction is made up of the ascii characters for a (41), t(54), t(54). this is then followed by the id number of the addressed sta tion as two ascii numbers 30 to 39 the instruction sent by the base station to address modem with id set to 2 will be: a t t 0 2 41 54 41 30 32 data modem 3 can be dialled up in the same way with the instruction: a t t 0 3 41 54 41 30 33 data the instruction string will not be transmitted over the air as long as it is sent to the modem without any breaks.
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 13 synthesised radio modem x8200 X8200HP figure 4 station addressing 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 inserte d before the data by the base station host: att00 figure 5 global addressing receiver sensitivity the receiver sensitivity can be adjusted so that th e modem is less likely to be affected by the presence of rf interference. this will cause a redu ction in overall range.
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 14 synthesised radio modem x8200 X8200HP restore defaults the factory settings will be automatically be resto red by pressing the horizontal arrow key followed by the enter key they will not be stored in the eeprom until save an d exit has be selected and the enter key pressed again exit without save the modem will return to normal operation without s toring the menu settings in the eeprom. press the horizontal arrow key followed by the ente r key. save & exit the modem will store the menu in the eeprom and ret urn to normal operation press the horizontal arrow key followed by the ente r key. return to main menu pressing the horizontal arrow key will return to th e main menu. enable at instructions pressing the horizontal arrow key will allow the mo dem to act on at instructions. message tag the number set as a message tag will be transmitted at the start of each data string. it will be passed to the host at the receiving station to indi cate the source of the data. the function is disabled by setting the message tag to 0000 tx priority with tx priority set n the modem will monitor the r f carrier frequency before transmitting. this is to prevent data collisions. if it is being used then a random number delay timer is started and the transmission is attempted again whe n this times out. if the tx priority is set to y then data will be im mediately transmitted regardless of whether there is an rf carrier detected or not. this is use d in environments with large amounts of rf emissions. fec the forward error correction algorithm puts redund ant bytes into the data string so that it can correct the data at the receiving modem. packetise data the packetised data option is set to y and the id n umber of the destination modem is set in the set repeater path. this could be a single id nu mber for a back to back system or multiple
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 15 synthesised radio modem x8200 X8200HP id numbers if a repeater path is to be used. data from the host is stored in the modem memory. w hen the number of data bytes equals the number set in packet size or if there is a gap detected in the incoming data the cts line is brought low. this line is connected to rts on the h ost and stops the data. a check sum is added to the data string and it is then transmitted over air. the data string is checked at the receiving modem a nd if no corruptions have taken place an acknowledge is sent to the transmitting modem. this then takes the cts line high and the sequence is repeated. if the receiving modem detects a data corruption a not acknowledge is sent to the transmitting modem and the data is sent again. the number of ret ries at set in the menu. number of retries the number of retries before the data is abandon c an be set between 0 and 99 using the horizontal arrow key. packet size the number of data bytes in the data packet can be set by the following number: 2 = 64 bytes 4 = 128 bytes 8 = 256 bytes 10 = 512 bytes 20 = 1024 bytes logger mode the modem will place all data from the host into it s 4k buffer memory. when it receives an addressed message from a distant modem all the cont ents of the memory will be transmitted. enable remote access enable remote access is set so that a local modem c an access, monitor or change the settings of a distant modem over the radio link. access remote modem. the radio link can be used to display the menu of a remote modem. all the parameters can be changed including the rf frequency and the rf power . in addition the value of the receiver signal strength will be radio back. first set the id number of the target modem in the first location of the repeater path by pressing the horizontal arrow until the number is a rrived at. press the enter key. if the id number is not known then 99 can be used as a univer sal entry code. please note that using 99 will address all the radio modems within radio rang e. move the cursor to access remote modem, press the horizontal arrow key to select y. then press the enter key. the menu from the target modem will be displayed along side the local modem. any and all the parameters can be altered using the arrow keys. in addition the signal strength
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 16 synthesised radio modem x8200 X8200HP at the distant modem will be displayed as a bar gra ph on the rssi setting. save & exit is used to update the menu of the dista nt modem. note that the real id of the distant modem has to be used. the 99 access code wi ll note allow the menu in a distant modem to be changed. this is to prevent all the men us of radio modems within radio range from being modified. setting exit without save to y and pressing the ent er key will disconnect the link engage repeater path data will be first set to the modem with the id num ber set in mo1 it will be then repeated to modem id set in mo2 and so on until the last id num ber set in the repeater chain. ata instruction can also be used from the host to s elect different paths and different destinations. set repeater path the engage repeater path is set to y. a repeater path is set up by using the horizontal keys to increment the set repeater path number. when it is the same as the id number of the repeater modem press the enter key. the next modem in the repeater chain is set in the same way. finally enter the id number of the destination modem the space bar is used to delete the entry. the serial ata instruction can also be used to sele ct a data path. it is made up of the ascii characters for a (41), t(54), a(41). this is follow ed by the number of stations (two ascii numbers) to be used in the repeater path followed by the destination station id numbers. (two ascii numbers). if the data string was to be transmitted to modem w ith id9 and it was to be repeated at modem id4 and then at modem id6. the ata instruction woul d be: a t a 3 stations id4 id6 id9 41 54 41 30 33 30 34 30 36 30 39 data the maximum number of repeaters is 99 . 6 radio transmission radio propagation when installing a x8200 radio modem there are a num ber of factors that should be considered as they will affect the performance of t he radio link. these are: transmitter power output. sensitivity of the receiver. height of transmitter and receiver antenna. length and type of the coaxial feeder cables to th e antenna. these should be low loss
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 17 synthesised radio modem x8200 X8200HP ru67 type and kept as short as possible. as a rule of thumb the rf power is halved every 10m of antenna feeder. it is better to keep the signal wire long and the antenna feeder short. type of antenna used. surrounding topography. interference for other networks operating on the sa me frequency. the weather. antennas the main types of antenna used in telemetry applic ations are as follows: helical end fed dipole yagi helical antenna the helical stub antenna is robust, low cost and p hysically small. it has a gain less than unity. range of up to 2km. end fed dipole the end fed dipole antenna has a unity gain. its m ain application is to provide cost effective omni-directional radiation. range 10 to 20 km yagi this antenna has a high gain typically twice (3db ) to ten times (10db) the input power in the direction of orientation. it is the type of aerial commonly used in domestic televisions. the output power of a transmitter connected to a y agi antenna has to be reduced to conform to the dti specification. this has the advantage 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 an tenna is used thereby extended range in the direction of orientation to around 20 km line of si ght. antenna alignment if directional yagi antenna are used it is importa nt to aligned them correctly. this can be done using a compass and ordinance survey maps. the alignment can be checked by selecting the key transmitter option at the transmi tting station. a radio modem is then attached to the yagi antenna feeder at the receivin g station. by selecting the rssi option in the menu the yagi antenna can be rotated to a posit ion of peak signal strength this will be in the direction of the transmitter beacon. site survey first check the occupancy of all the radio channel s at all the proposed sites. this can be achieved by using an antenna, radio modem and pc. s elect the rssi option and observe the bar graph. note any activity. go to the rf chan nel option and select the next rf
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 18 synthesised radio modem x8200 X8200HP channel. again observe the rssi reading and make a note of any activity. repeat this for all the rf channels. the radio range can be tested by erecting a radio m odem, antenna and pc at the proposed base station site. select the key transmitter optio n. use a second radio modem, antenna at the distant si te. if the rx led is lit then there is a good propagation path. in addition the rssi option can be selected for a more accurate reading of the signal strength. the propagation path can be tested by using the acc ess remote modem option. the rssi value from each of the distant modems will be measu red, radioed back and displayed radio propagation when installing a x8200 radio modem there are a num ber of factors that should be considered as they will affect the performance of t he radio link. these are: transmitter power output. sensitivity of the receiver. height of transmitter and receiver antenna. length and type of the coaxial feeder cables to th e antenna. these should be low loss ru67 type and kept as short as possible. as a rule of th umb the rf power is halved every 10m of antenna feeder. it is better to keep the signal wi re long and the antenna feeder short. type of antenna used. surrounding topography. interference for other networks operating on the sa me frequency. the weather. 7 trouble shooting no data transmission check that td and rd are connected to the 9 way d connector correctly. this can be checked by using a voltmeter: a) connect the host to the modem. b) with no signal present, measure the voltage be tween: 0v (pin 5) and td (pin 3) 0v (pin 5) and rd (pin 2) c) both should be between -5v to -15v. if only one is at a negative voltage then the rd an d td connections are reversed. no data reception if the rx led on the receiver is not lighting at t he same time as the tx led on the transmitter then check the rf frequency is the same on both modems. if the rx led is lit when no data is being transmi tted then there might be another user on the channel. select an rf channel were the rx led is no t lit. if rx led is flickering on all rf channels then lo ok for a source of local interference such as a switch mode power supply or a computer in close p roximity.
ds8200-2 april ?07 ?2007 rf solutions ltd, www.rfso lutions.co.uk page 19 synthesised radio modem x8200 X8200HP if there are other radio modems or radio telemetry systems operating on adjacent frequencies on the same site then the antenna on your system mu st be mounted at least 3m away from the antenna of the other systems. this will prevent the transmitter of one system interfering with the receiver of the other. corrupted data corrupted data can be caused by poor power supplie s. check that the power supply is regulated at 12v a nd has a ripple of less than 50mv on load. it must also be capable of delivering an inrush cur rent of 0.7amps for 20msec. when the radio modem starts its transmit cycle. the ripple voltage can be measured with a voltmete r set on a.c. volts. radio path the radio path can be tested by using the access r emote modem option. if the remote modem is in radio range and is receiving good data it will respond by displaying the signal strength of the remote modem in the rssi option. if the remote modem does not respond then use the key transmitter option to permanently transmit a carrier. go to the distant modem and obs erve the rx led. it should be on. alternatively access the set up menu and select th e rssi option. a minimum of 3 bars should be shown.

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