RIM 902M Integrator Manual Download

Page: 64 / 64

Index: Shielding

Integrator’s Guide – RIM 902M OEM Radio Modem

Reliability

noise immunity • 2

RIM 900

battery life • 3
controlling • 43
features • 1
output power • 2
physical size • 3, 22

RS232 • 54

Schematics

8250 serial interface • 44

Shutdown • 42
Startup

turning the radio on • 42
TURNON • 38

Temperature range • 22

Summary of Contents for 902M

Page 1: ...QWHJUDWRU V XLGH 5 0 0 2 0 5DGLR 0RGHP...

Page 2: ...t is for the use of licensed users only Any unauthorised copying distribution or disclosure of information is a violation of copyright laws While every effort has been made to ensure technical accurac...

Page 3: ...nst harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the manufacture s instructi...

Page 4: ...dustry Canada RSS 119 under certification number TBD IC Class B compliance This device complies with the Class B limits for radio noise emissions as set out in the interference causing equipment stand...

Page 5: ...diagnostics tool 12 3 Mechanical integration 21 Environmental properties 21 Physical properties 22 Mounting methods 24 Cables and connectors 27 4 Power requirements 31 Load specifications 31 Batteries...

Page 6: ...Introduction to antenna terminology 46 Positioning the antenna 49 Shielding 50 Specifications 51 Glossary of terms 53 Index 55...

Page 7: ...nting requirements x power battery characteristics x interfacing to the RIM 902M x antenna selection and placement Throughout the guide there are suggestions and precautions that will ease the impleme...

Page 8: ......

Page 9: ...h Mobitex wide area wireless data networks operating in the 900 MHz range such as the BellSouth Intelligent Wireless Network RIM radio modems are specifically designed to integrate easily into a compu...

Page 10: ...evelopment Noise immunity The RIM 902M is not de sensitized by the electromagnetic interference EMI or noise that is generated by the electronics of the terminal into which it is integrated As a resul...

Page 11: ...tion the receiver is also turned ON and kept ON for 10 seconds after any communication transmit or receive with the network Standby power 0 3 mA at 4 5V Standby power consumption is very low and occur...

Page 12: ...urrently Mobitex networks in other countries operate at other frequencies such as 400 MHz Mobitex provides highly reliable two way digital data transmission The network provides error detection and co...

Page 13: ...terfering with other packets sent over the same frequency by different users At the receiving end all packets are accounted for and reassembled into the original message Set up time is eliminated and...

Page 14: ...for hands wrists and feet averaged over 10 g of tissue The limits for Occupational Controlled exposure are more relaxed i e 8 W kg for partial body and 20 W kg for hands wrists and feet The 1 6 W kg...

Page 15: ...o Modem Integrator s Guide Label If the final device configuration cannot be controlled so as to limit the user distance to the antenna then the device needs to have an RF radiation hazard label warni...

Page 16: ......

Page 17: ...many of these tools with the RIM 902M OEM Developer s Kit The purpose of the Kit is to accelerate radio integration and to help system designers evaluate the RIM 902M Using the Kit you can quickly beg...

Page 18: ...ld damage the RIM 902M which is typically integrated into a device that operates an asynchronous serial port at 3 0V The RS 232 interface on the test board allows you to produce an output from the rad...

Page 19: ...ome other computing device with an RS 232 serial interface To do this you will use the test board and cables supplied with your RIM 902M Developer s Kit 1 Flat serial cable test board to radio The fla...

Page 20: ...as the roof of a car When used inside a building performance is improved if the antenna is located near a window with few obstacles wall furniture equipment etc between the antenna and the window The...

Page 21: ...ine interface is not documented here but the commands it uses are the same as those described below Select the COM port which communicates with the RIM 902M and configure for 9600 bps and either 7E1 7...

Page 22: ...e better the coverage The RSSI is given both as a percentage and in dBPV decibel microvolts To obtain the RSSI in dBm decibel milliwatts subtract 113 from the dBPV value Note that RSSI 0 0 dBPV does n...

Page 23: ...network operator Note that it can take 30 seconds for a radio to display Group List OK UpFreq and DoFreq show the channels in hexadecimal that you are using to transmit and receive respectively If you...

Page 24: ...r the modem has been in network coverage for several minutes your radio modem is probably not activated Contact the network operator to activate your device 0100 Another device may be using the same M...

Page 25: ...33 B433 Contact Yes Mode PowerSave Live Tx Enabled Active Yes Group List Born UpFreq 02FF DoFreq 0F2F Base Area 14 0A Status 0080 Change network name You may now enter a number corresponding to the de...

Page 26: ...indicating that the MPAK was sent A few seconds later it should also indicate that the MPAK was received This confirms that your radio modem is operational and active on the network If you get the mes...

Page 27: ...adio has not been activated then the network will not send the MPAK back to the radio Second make sure that you are in network coverage You can determine whether you are in coverage by looking at Cont...

Page 28: ......

Page 29: ...subjects them to a variety of harsh conditions We measure over a hundred digital RF calibration parameters once before and once after each test The difference between these measurements precisely rev...

Page 30: ...temperature limit of 70qC as performance degradation or damage to the power amplifier may occur past this point especially when packets are transmitted frequently Physical properties Weight The RIM 90...

Page 31: ...Mechanical integration Physical properties 23 RIM 902M OEM Radio Modem Integrator s Guide...

Page 32: ...t the RIM 902M remains securely attached in the environment where it will be used The following information is presented as a guide but applications can vary considerably A mechanical engineer can hel...

Page 33: ...unting methods 25 RIM 902M OEM Radio Modem Integrator s Guide Tie wraps Tie wraps can be used to as a secure but non permanent means of attaching the RIM 902M to a surface Typically each tie wrap pass...

Page 34: ...is method of mounting is preferable to bolts because adhesive is easier to use in a manufacturing environment and is more resistant than bolts to loosening In many cases an effective solution is to ad...

Page 35: ...ls are carried on a flat 22 conductor 0 30 mm 0 012 thick flexible printed circuit FPC cable in 1 00 mm centerline spacing which can plug into a matching connector Since each application is unique Mol...

Page 36: ...he mating force to withstand heavy vibration Typically an antenna does not plug directly into a RIM 902M Instead an connector at the outer casing of the device This allows the antenna to be removed fr...

Page 37: ...111 SMA connector EZ Flex 405 Low loss matching 50 cable 133REEZ4 12 S2 1216 8 cable straight MMCX to SMA 133REEZ4 12 S2 1699 8 cable right angle MMCX to SMA The following cable is included with the...

Page 38: ......

Page 39: ...power required changes rapidly depending on whether the radio is transmitting receiving or in standby The load profile is given on the following page These specifications can be given directly to your...

Page 40: ...nsumption transmit 0 17 receive 9 74 standby 90 09 transmit 1 receive 5 standby 94 5 7 mA 20 0 mA Transmit duration minimum maximum 32 ms 1 s Off current consumption d 20 PA Batteries When integrated...

Page 41: ...rges this number may drop to 50 percent Some precautions must be taken with this type of battery These cells are also not intended to be used to their full capacity so the actual useful run time of th...

Page 42: ...load specifications These should have a value of 20 volts and be placed on the supply side of the regulator circuit RIM recommends a supply capable of providing 4 5 V and rated for 2 5 A peak current...

Page 43: ...the RIM 902M radio modem and the computing device to which it is attached Two protocols are supported Mobitex Asynchronous Communication MASC and Radio Access Protocol RAP If you are using a MASC app...

Page 44: ...opment time complexity and memory consumption It also provides double the throughput of MASC by using binary frame data transfers instead of hex ASCII encoding Since every application is different the...

Page 45: ...han 2 5 volts Pins 1 through 4 the general purpose I O lines are strictly a 3 0 volt interface they are not 5 0 volt tolerant This section describes the purpose of each of the 22 lines that comprise t...

Page 46: ...t to the radio This line turns on the radio unit It is a digital signal that eliminates the need for an on off switch across the power supply to the radio Information about the use of this pin is cont...

Page 47: ...en the radio needs to communicate with it If DTR is already asserted low when the radio has data to send the computing device RI will not be asserted For MASC implementations in normal serial mode thi...

Page 48: ...send state of this line is low All MASC implementations require this line This line is optional for RAP implementations Connect RTS to ground if your application does not require it This is an input...

Page 49: ...d a MASC B frame to the computing device if MASC is the protocol being used and will allow communication to resume If you do not intend to use DTR tie it to ground to ensure that it is always asserted...

Page 50: ...e should first check the ONI pin If ONI is high but TURNON is being held low then your application has recently requested the radio to shut down and the radio is performing shutdown operations and sho...

Page 51: ...rk but which has not been transferred to the computing device will not be saved The MPAKs will be lost when the unit enters shutdown or is turned off A controlled shutdown is necessary to allow the RI...

Page 52: ...44 Interface specification Interface to microprocessor Integrator s Guide RIM 902M OEM Radio Modem...

Page 53: ...ciency coverage area and battery life Selecting an antenna Antenna manufacturers have designed and manufactured a wide variety of antennas for use on the Mobitex network and for other RF systems opera...

Page 54: ...ation 896 to 902M MHz transmit 935 to 941 MHz receive Acceptable return loss VSWR 2 0 or RL 10 dB minimum VSWR 1 5 or RL 14 dB recommended required across all frequencies of operation Introduction to...

Page 55: ...l power radiated by the antenna in the direction of maximum gain and polarization Impedance matching return loss and VSWR The antenna cables and connectors in a radio frequency system must all possess...

Page 56: ...hese frequencies is VSWR 1 5 or RL 14 dB Antenna size The optimal antenna radiation efficiency is produced by an antenna measuring one wavelength O The value of O for the RIM 902M is 32 8 cm and is ca...

Page 57: ...ting device and its internal components may attenuate the signal in certain directions This is not desirable as it would reduce the sensitivity and transmit performance of the radio modem when the com...

Page 58: ...any additional RF shielding between the RIM 902M and a computing device In fact it would be more important for the power supply to the RIM 902M to be free of high frequency electrical noise than to pr...

Page 59: ...based upon 94 standby 5 receive 1 transmit RF properties x Transmit frequency 896 to 902M MHz x 2 0 W nominal maximum transmit power at antenna port x Transmitter can reduce output power to 0 06 Watts...

Page 60: ...ertified by RAM Mobile Data to meet Mobitex Interface Specifications MIS including the following features i Personal subscriptions i ESN verification i Switching between different Mobitex networks i F...

Page 61: ...nications The link layer protocol exchanged via an asynchronous full duplex serial channel between a data terminal or computing device and the RIM 902M OEM Radio Modem MMCX The connector on the RIM 90...

Page 62: ...nfuse this with radioactive particle emissions caused by nuclear reactions RAP Radio Access Protocol An alternative to the MASC protocol found on the RIM 902M Provides simpler implementation and faste...

Page 63: ...cting to 27 connecting to an RS232 device 43 pin descriptions 37 UART 54 Interface and Test Board LED indicators 11 M MAN 53 MASC 53 MOA 4 Mobitex 53 overview 4 packet switching 5 Mounting permanent 2...

Page 64: ...Radio Modem R Reliability noise immunity 2 RIM 900 battery life 3 controlling 43 features 1 output power 2 physical size 3 22 RS232 54 S Schematics 8250 serial interface 44 Shutdown 42 Startup turnin...

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