GSM35 900/1800MHz GSM Modem Module User`s Manual
Contents
1. Fig 3 3 External SIM card interface of the GSM35 GSM35 17 RTD Finland Oy User s Manual Figure 3 4 below shows a picture of the external SIM card interface board FINLAND A 1 ESIM2035 Ver 1 0 Fig 3 4 ESIM2035 board Note that the ESIM2035 is configured differently for the GSM20 and the GSM35 GPRS35 The units are not interchangeable the GSM35 and the GPRS are identical in their SIM interfaces Once the TC35 GSM modem is able to initialise itself after power up and correctly detect the SIM card the green status LED will be lit If the LED is not illuminated you can not interface to your GSM modem See Figure 3 3 for the location of the STAT LED The header mounting holes immediately next to the LED can be used to connect to an LED externally mounted to the enclosure wall for example The STAT LED will not indicate detection of the GSM field or network access External SIM card interface J25 The figure 3 4 below shows the GSM35 external SIM card interface header J25 that is used to connect to board the ESIM2035 J25 g o OO OO O Ola o O Fig 3 5 External SIM card header J25 available only on GSM35 2 boards GSM35 18 RTD Finland Oy User s Manual Chapter 4 HARDWARE DESCRIPTION This chapter describes the major hardware building blocks of the GSM35 e The GSM wireless modem module e GSM antenna considerations e SIM card reader e UART serial port circuitry o Digital I O EXT S2. With no power applied insert your 3V or dual voltage SIM into the card holder on the solder side of the board Connect the antenna cable to the TC35 antenna connector and power up your PC 104 system The GSM35 will initioalise with the system After this the status LED will blink for a while until the TC35 is logged into the network If you have the PIN code enabled the GSM35 status LED will continue to blink until the PIN code is given through the terminal mode with AT command AT CPIN XXXX unless ATASFLC facility lock for PIN code has been set Once the GSM35 is logged onto the network the LED will be lit continuously INTERRUPTS What is an interrupt An interrupt is an event that causes the processor in your computer to temporarily halt its current process and execute another routine Upon completion of the new routine control is returned to the original routine at the point where its execution was interrupted Interrupts are a very flexible way of dealing with asynchronous events Keyboard activity is a good example your computer cannot predict when you might press a key and it would be a waste of processor time to do nothing whilst waiting for a keystroke to occur Thus the interrupt scheme is used and the processor proceeds with other tasks When a keystroke finally occurs the keyboard then interrupts the processor so that it can get the keyboard data It then places it into the memory and then returns to what it was doing b
3. add an entry to your SIM card you may use the AT CPBW command In this example we add the RTD Finland phone number 358 9 346 4538 to the SIM card memory location 1 with the following AT command set AT CPBW 1 35893464538 145 RT DFinland AT CREG Will indicate if the GSM35 is logged into the network If the reply for example is CREG 0 1 it means that connection to the home network is valid A complete AT instruction set documentation is included in the TC35 user s manual UART serial port circuitry GSM data is sent and received through a standard 16C550 compatible UART All today s operating systems will recognize and support this serial communication device The GSM35 uses its own onboard serial port and will not reserve serial port resources from the system The I O base address and interrupt for this serial port can be flexibly set as has been described in previous chapters of this manual This user s manual will not wade into details of serial port programming This information is commonly available today You can use any communication software package or terminal program to connect to your GSM35 UART Just make sure you set up the I O and IRQ are set right The correct terminal speed for AT commands is 9600 baud 8 databits no parity one stopbit and hardware handshake The UART on the board is specified for full operation from 40 to 85C The oscillator frequency is set to be 1 8432MHz Note that the UART interrupt can b
4. 2 RTD Finland Oy User s Manual Limited Warranty Real Time Devices Inc warrants the hardware and software products it manufactures and produces to be free from defects in materials and workmanship for one year following the date of shipment from REAL TIME DEVICES This warranty is limited to the original purchaser of product and is not transferable During the one year warranty period REAL TIME DEVICES will repair or replace at its option any defective products or parts at no additional charge provided that the product is returned shipping prepaid to REAL TIME DEVICES All replaced parts and products become the property of REAL TIME DEVICES Before returning any product for repair customers are required to contact the factory for an RMA number THIS LIMITED WARRANTY DOES NOT EXTEND TO ANY PRODUCTS WHICH HAVE BEEN DAMAGED AS A RESULT OF ACCIDENT MISUSE ABUSE such as use of incorrect input voltages improper or insufficient ventilation failure to follow the operating instructions that are provided by REAL TIME DEVICES acts of God or other contingencies beyond the control of REAL TIME DEVICES OR AS A RESULT OF SERVICE OR MODIFICATION BY ANYONE OTHER THAN REAL TIME DEVICES EXCEPT AS EXPRESSLY SET FORTH ABOVE NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND REAL TIME DEVICES EXPRESSLY DISCLAIMS ALL WARRANTIES NOT S
5. 35 5 RTD Finland Oy User s Manual Chapter 5 Board operation and programming 23 Defining the memory Map cc cceceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeceaeeeeeeeeeeeeees 23 GSM BASE 400h Digital MO cence cutecitiedcedeuedinac acu d leuk ieee 24 GSM BASE 402h status register 24 GSM BASE 403h control register c cccceceeeeeeeseeeeeeeeeeeeeeeeeeeeseeeees 24 Starting up and logging into the GSM network ssseeeeeeeeeeeeees 25 gi 21d 10 0 eee Peer nent MRP PRP a a PEPER ERP EERE ERP ERE ERP mR a EOE 25 Chapter 6 GSM35 Specifications 0008 31 Chapter 7 Return policy and warranty 0 32 List of illustrations and tables Fi g 2 1 GSM35 Board layout showing jumper locations Fig 2 2 Base address jumpers illustrating address 2E8h Fig 2 3 Interrupt jumpers from left to right IRQ 2 5 6 7 10 11 12 15 and G Fig 3 1 GSM35 integrated in a RTD PC 104 cpuModule stack together with a HPWR104HR and a CMM series cpuModule Fig 3 2 Digital I O connector layout of the GSM35 Fig 3 3 External SIM card interface of the GSM35 Fig 3 4 ESIM2035 External SIM card interface board Fig 3 5 External SIM card header J25 Only on GSM35 2 boards Fig 4 1 Block diagram of the GSM35 Table 2 1 Factory configured jumper settings Table 2 2 Base address jumper settings GSM35 Table 3 1 Pin outs of the GSM35 digital I O interface connector Table 5 1 General I O map of the GSM35 UART GSM3
6. 5 GPRS35 F I ibobolbo I T wose HH 5V 12V 12V LL cmmesseczoo 32 Fig 3 1 GSM35 integrated in a RTD PC 104 cpuModule stack together with a HPWR104HR power supply module and a CMM series cpuModule General purpose digital I O connector The Table 3 1 below shows the pin outs of the GSM35 digital I O interface The signals in this geader connector can be used as general purpose TTL level I O lines to interface to LCD displays LED s bush buttons or relays Note that Figure 3 2 shows two connectors together The connector J28 carries all inputs and J3 carries all the outputs PIN J2 Description PIN J2 Description 1 GND 2 Outo 3 Out1 4 Out2 5 Out3 6 Out4 7 Out5 8 Out6 9 Out7 10 5V PIN J16 Description PIN J16 Description 1 GND 2 Ind 3 Int 4 In2 5 In3 6 In4 7 In5 8 In6 9 In7 10 5V Table 3 1 Pin outs of the GSM35 digital I O interface connector GSM35 16 RTD Finland Oy User s Manual Fig 3 2 Digital I O connector layout of the GSM35 SIM card holder The figure 3 3 below shows the mechanical construction of the 3V standard SIM card holder In the figure the card is in the ejected state Press the card carrier into the holder To eject the SIM card press the yellow ejector button The GSM35 also supports an external SIM card interface board the ESIM2035 This external card interface can be attached to the wall of your enclosure with a 150mm long cable This is the maximum guaranteed length J29
7. 5 6 RTD Finland Oy User s Manual Chapter 1 INTRODUCTION This user s manual describes the operation of the RTD GSM35 integrated global GSM wireless modem designed for mobile marine and automotive applications Features Some of the key features of the GSM35 include Low power Dual band Siemens TC35 cellular engine GSM900 1800Mhz 9 6 14 4 kbit s datarate group 3 faxes SMS and SMS cell broadcast Onboard SIM card socket for 3V standard cards 16C550 UART interfaces to host computer Supports COM1 COM2 COM3 COM4 or COMx Available IRQ s 2 5 6 7 10 11 12 14 15 Status LED indicating GSM activity and status 16 TTL I O s 8 outputs 8 inputs 5V only operation 2 3W typical Wide operating temperature range 20 to 70C guaranteed Onboard temperature sensor Fully PC 104 compliant IDAN versions available The following paragraphs briefly describe the major features of the GSM35 A more detailed discussion is included in Chapter 4 Hardware description The boards installation is described in Chapter 2 Board Installation GSM cellular modem The Real Time Devices GSM35 wireless GSM modem unit provides a direct and reliable GSM connection to stationary or GSM 900 1800 mobile fields around the world GSM connectivity is achieved using the Siemens TC35 engine This unit works in the 900 1800MHz band supporting GSM 02 22 network and service provider personalisation Connect any standard GSM antenna directly to the OSX connector
8. G Co G C0 G G0 OG Co oO A OO AH AH oo Mm AH OO AH S O O O O O O ak h h h h h 0 1 0 1 0 1 0 1 0 268 ero fo 11 1 1 0 3F0 1 1471 1 01 fare o 11 4 1 1 sre 147111711 0 JUMPER OFF 1 JUMPER CLOSED m co 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0 10 0 0 0 000 1 0010 001 1 01 0 0 0101 0110 01 11 1000 1001 1010 1011 1100 1101 11 0 z 1 1 1 Table 2 2 Base address jumper settings for the GSM35 the default jumper setting is highlighted GSM35 13 RTD Finland Oy User s Manual BASE S AB Fig 2 2 Base address jumpers illustrating address 2E8 Host interrupts Factory setting IRQ5 G closed The header connector shown in Figure 2 3 below lets you connect the onboard control logic interrupt outputs to one of the interrupt channels available on the host computer XT AT bus RA KS Fig 2 3 Interrupt jumpers from left to right IRQ2 5 6 7 10 11 12 14 15 and G Note The GSM35 hardware supports interrupt sharing Jumper G must be closed on one module per used interrupt For example if two boards share interrupt number 7 only one board may have the G jumper closed The G jumper connects a 1KOhm resistor to ground while the shared interrupts are 3 stated pulling the line to an inactive level GSM35 14 RTD Finland Oy User s Manual Cha
9. GSM35 900 1800MHz GSM Modem Module User s Manual Hardware revision 1 1 VILLA Real Time Devices Inc Accessing the Analog World g User s Manual GSM35 GSM Modem Module User s Manual REAL TIME DEVICES FINLAND OY LEPOLANTIE 14 FIN 00660 HELSINKI FINLAND Phone 358 9 346 4538 FAX 358 9 346 4539 EMail sales rtdfinland fi techsupport rtdfinland fi Websites http www rtdfinland fi http www rtdusa com GSM35 2 RTD Finland Oy User s Manual WARNING LIFE SUPPORT APPLICATIONS This product is not designed for use in life support appliances devices or systems where malfunctioning of these products can reasonably be expected to result in personal injury RTD customers using or selling this product for use in these applications do so at their own risk and fully agree to indemnify RTD for any damages resulting from such improper use or sale SAFETY PRECAUTIONS FOR THE USER 1 AIRCRAFT SAFETY The TC35 cellular engine used on the GSM35 can interfere with an aircrafts navigation system and it s cellular network Using your GSM35 on board aircraft is forbidden by law Failure to comply with this prohibition may lead to temporary suspension or permanent cancellation of cellular services for the person who infringes this prohibition and or legal action against said person 2 ENVIRONMENTS WITH EXPLOSIVE SUBSTANCES Users are not advised to use the GSM35 in automotive service stat
10. IM INTERFACE SV SIM CARD S TC35 ihe CELLULAR MODEM UNIT i STATUS LED 5 ANTENNA toma do RX TX PC 104 BUS DIG 1 0 E HI _ ADDRESS TEMPERATURE 6 DECODER SENSOR V GSM35 N Fig 4 1 Block diagram of the GSM35 GSM35 19 RTD Finland Oy User s Manual The GSM wireless modem module The GSM35 wireless GSM modem is built around the Siemens TC35 dual band 900 1800MHz cellular engine It is designed both for handling complex industrial applications such as telemetry telematics or communication and for integration in stationary or mobile fields all over the world General information on these products is available at the following Internet addresses http www siemens de gsm_e and http www siemens de gsm in german language The GSM35 is capable of powerful communication over a speed of 9 6 kbps or CSD up to 14 4 kbps as of 06 2001 It is capable of FAX and SMS text messages The data terminal rate is 9600 baud for all host commands AT commands The GSM35 modem module antenna interface connector uses an OSX connector The mating antenna connectors and cables are supplied from RTD Finland Oy Temperature monitoring is possible using the onboard temperature sensor Limit data can be interrogated from the GSM35 status register bits 2 3 GSM Antenna considerations The antenna used must meet the following specifications Frequency 890 910 MHz TX 935 960MHz RX Impedance 50 Ohms V
11. IRQ mask bit in the IMR Forgetting to send the EOI command after ISR code Disables further interrupts GSM35 29 RTD Finland Oy User s Manual GSM35 Example on Interrupt vector table setup in C code void far interrupt new_IRQ1_handler void ISR function define IRQ1_VECTOR 3 Name for IRQ void interrupt far old_IRQ1_ dispatcher es ds di si bp sp bx dx cx ax ip cs flags Variable to store old IRQ_Vector void far interrupt new_IRQ1_handler void Function init irg handlers Inputs Nothing Returns Nothing Purpose Set the pointers in the interrupt table to point to our funtions ie setup for ISR s void init_irq_handlers void _disable old_IRQ1_handler dos getvect IRQ1 VECTOR 8 _dos_setvect IRQ1_VECTOR 8 new IRQ1 handler Gi old mask inp 0x21 outp 0x21 Gi old mask 1 lt lt IRQ1_VECTOR _enable PB E ES rene Be a ee he ht aie ee Function restore do this before exiting program Inputs Nothing Returns Nothing Purpose Restore the interrupt vector table void restore void Restore the old vectors _disable _dos_setvect IRQ1_VECTOR 8 old_IRQ1_handler outp 0x21 Gi old mask _enable 30 RTD Finland Oy User s Manual Chapter 6 GSM35 SPECIFICATIONS Host interface 16 bit PC 104 bus XT bus used for data XT and AT interrupts available GSM modem specifications Operational GSM compatibility Datar
12. M35 RXD register Issue the EOI command to the 8259 by writing 20h to 20h Pop all registers Most C compilers do this automatically The following C example shows what the shell of your ISR should be like GSM35 ee ee ee eee eee Function new_IRQ_handler Inputs Nothing Returns Nothing void interrupt far new_IRQ_handler void IRQ_flag 1 Indicate to process interrupt has occurred Your program code to read UART read to a data buffer for example Guc_buffer Gi_bufpos inp gi SERIAL DATA outp 0x20 0x20 Acknowledge the interrupt controller 28 RTD Finland Oy User s Manual Saving the Startup Interrupt Mask Register IMR and interrupt vector The next step after writing the ISR is to save the startup state of the interrupt mask register IMR and the original interrupt vector you are using The IMR is located in address 21h The interrupt vector you will be using is located in the interrupt vector table which is an array of pointers addresses and it is locate din the first 1024 bytes of the memory Segment 0 offset 0 You can read this value directly but it is better practice to use DOS function 35h get interrupt vector to do this Most C compilers have a special function available for doing this The vectors for the hardware interrupts on the XT bus are vectors 8 15 where IRQO uses vector 8 and IRQ7 us
13. P and processor flags from the system stack These were pushed onto the stack when entering the ISR Most compilers allow you to identify a function as an interrupt type and will automatically add these instructions to your ISR with one exception most compilers do not automatically add the EOI command to the function you must do it yourself Other than this and a few exceptions discussed below you can write your ISR as any code routine It can call other functions and procedures in your program and it can access global data If you are writing your first ISR we recommend you stick to the basics just something that enables you to verify you have entered the ISR and executed it successfully For example set a flag in your ISR and in your main program check for the flag Note If you choose to write your ISR in in line Assembly you must push and pop registers correctly and exit the routine with the IRET instruction instead of the RET instruction There are a few precautions you must consider when writing ISR s The most important is do not use any DOS functions or functions that call DOS functions from an interrupt routine DOS is not re entrant that is a DOS function cannot call itself In typical programming this will not happen because of the way DOS is written But what about using interrupts Consider then the following situation in your program If DOS function X is being executed when an interrupt occurs and the interrupt routine make
14. SWR 1 7 1 TX 1 9 1 RX Gain lt 1 5dB references to 1 2 dipole 1W power cw max 2W peak at 55 degrees Centigrade Typically standard GSM antennas use a female FME connector This connector needs an adapter unit before it can be connected to the GSM35 RTD Finland Oy recommends the use of high quality antennas with the GSM35 We have tested successfully with antennas from Hirschmann Rheinmetall Elektronik Visit http www hirschmann de for information on GSM antennae A very useful AT command that shows quality of the signal reception is AT SCQ the signal quality CSQ value Value should be gt 11 shows the quality of the network signal GSM35 20 RTD Finland Oy User s Manual SIM card reader Standard 3V and dual voltage SIM cards can be used with the GSM35 Older 5V SIM cards will not work though they may operate in standard GSM cellular phones These new 3V SIM cards are no older than two years The SIM card holder has a card detection circuit that will in theory allow hot insertion and removal of the card This is NOT recommended since the SIM card contenets can become corrupted if it is removed while the TC35 GSM modem is writing to it A very useful AT command that shows detestion of the SIM card is ATASCID The SIM card identifier is given as a reply SCID value shows the ID of the SIM card If no ID is detected the TC35 can not read the SIM card and can not connect to the GSM service provider network To
15. TATED HEREIN ALL IMPLIED WARRANTIES INCLUDING IMPLIED WARRANTIES FOR MECHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE LIMITED TO THE DURATION OF THIS WARRANTY IN THE EVENT THE PRODUCT IS NOT FREE FROM DEFECTS AS WARRANTED ABOVE THE PURCHASER S SOLE REMEDY SHALL BE REPAIR OR REPLACEMENT AS PROVIDED ABOVE UNDER NO CIRCUMSTANCES WILL REAL TIME DEVICES BE LIABLE TO THE PURCHASER OR ANY USER FOR ANY DAMAGES INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES EXPENSES LOST PROFITS LOST SAVINGS OR OTHER DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PRODUCT SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR CONSUMER PRODUCTS AND SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE GSM35 33 RTD Finland Oy
16. ate Services supported Network personalisation Status indicator Output power SIM card reader Voltage Compatibility Detection Antenna Interface Impedance VSWR Gain 3dB width of cone Maximum power Connector UART and I O UART compatibility Oscillator frequency Connection Base addresses Interrupts Digital I O GSM35 Electromechanical GSM35 Operating temperature range Humidity Altitude Vibration Power consumption 31 EGSM900 and GSM1800 phase 2 2 9600 baud 14400 baud CSD GSM data transmisson SMS Fax group 3 GSM 02 22 1 LED Class 4 4W EGSM900 Class 1 1W GSM1800 3V or dual voltage cards GSM11 11 and 11 12 SIM card detection supported 50 Ohms TX max 1 7 1 installed RX max 1 9 1 installed gt 1 5dB referenced to 1 2L dipole vertical 80 deg horizontal 360 deg 1W cw 2 W peak at 55C ambient OSX 16C550 compatible 1 8432MHz Full hardware handshaking supported 3214 2 5 7 10 11 12 14 and 15 8 TTL outputs 8 TTL inputs w 10K pull down 20 to 70 C for the GSM operation RH up to 95 non condensing 1000 to 60 000 ft Survival 10G peak 2 3W min RTD Finland Oy User s Manual Chapter 7 RETURN POLICY AND WARRANTY Return Policy GSM35 If the module requires repair you may return it to us by following the procedure listed below Caution Failure to follow this return procedure will almost always delay repair Please help us expedite your repair b
17. e disabled or enabled from software by writing to bit 01 in address BASE 0x402 GSM35 21 RTD Finland Oy User s Manual Digital I O For general purpose digital I O interfacing a 16 bit digital I O port is provided This port includes 8 TTL level digital outputs that are cleared to 0 after system reset Also are included 8 digital inputs with 10K Ohm pull down resistors These I O s are located on the left side of the board These I O s are ideal to be used to interface to LCD displays LED s pushbuttons or other low power controls GSM35 22 RTD Finland Oy User s Manual GSM35 Chapter5 BOARD OPERATION AND PROGRAMMING This chapter shows you how to program and use your GSM35 It provides a general description of the I O map Detailed serial port programming tips are not within the scope of this manual Defining the Memory Map The memory map of the GSM35 occupies two groups of eight bytes of host PC I O space This window is freely selectable by the user as described in Chapter 2 Table 2 2 After setting the base address you have access to the internal resources of the GSM35 control logic These resources are not described in detail since they are mapped as a standard PC serial port For more details on the EXAR ST16C5501J44 UART chip programming please download the component specific data t from the website http www exar com products st16c550 html ADDR hex REGISTER COMMENTS BASE TXD Only if contr
18. efore the interrupt occurred Other common devices that use interrupts are A D boards network boards other used serial ports etc Interrupt request lines To allow different peripheral devices to generate interrupts on the same computer the PC AT bus has interrupt request channels IRQ s A rising edge transition on one of these lines will be latched into the interrupt controller The interrupt controller checks to see if the interrupts are to be acknowledged from that IRQ and if another interrupt is being processed it decides if the new request should supercede the one in progress or if it has to wait until the one in progress has been completed The priority level of the interrupt is determined by the number of the IRQ as follows IRQO has the highest priority whilst IRQ15 has the lowest Many of the IRQ s are already used by the standard system resources IRQO is dedicated to the internal timer IRQ1 is dedicated to the keyboard input GSM35 25 RTD Finland Oy User s Manual IRQ3 for the serial port COM2 and IRQ4 for the serial port COM1 Often interrupts 2 5 7 10 11 and 15 are free for the user 8259 Programmable Interrupt Controller The chip responsible for handling interrupt requests in a PC is the 8259 Interrupt Controller To use interrupts you will need to know how to read and set the 8259 s internal interrupt mask register IMR and how to send the end of interrupt EOI command to acknowledge the 8259 interrupt control
19. es vector 15 Thus if your GSM35 is using IRQ5 it corresponds to vector number 13 Before you install your ISR temporarily mask out the IRQ you will be using This prevents the IRQ from requesting an interrupt while you are installing and initializing your ISR To mask the IRQ read the current IMR at I O port 21h and set the bit that corresponds to the IRQ The IMR is arranged so that bit 0 is for IRQO and bit 7 is for IRQ7 See the paragraph entitled Interrupt Mask Register IMR earlier in this discussion for help in determining your IRQ s bit After setting the bit write the new value to I O port 21h With the startup IMR saved and the interrupts temporarily disabled you can assign the interrupt vector to point to your ISR Again you can overwrite the appropriate entry in the vector table with a direct memory write but this is not recommended Instead use the DOS function 25h Set Interrupt Vector or if your compiler provides it the library routine for setting up interrupt vectors Remember that interrupt vector 8 corresponds to IRQO vector 9 for IRQ1 etc If you need to program the source of your interrupts do that next For example if you are using transmitted or received messages as an interrupt source program it to do that Finally clear the mask bit for your IRQ in the IMR This will enable your IRQ Common Interrupt mistakes Remember hardware interrupts are from 8 15 XT IRQ s are numbered 0 7 Do not forget to clear the
20. gistered trademark of Real Time Devices utilityModule is a trademark of Real Time Devices All other trademarks appearing in this document are the property of their respective owners GSM35 4 RTD Finland Oy User s Manual Table of Contents List of illustrations and tables 00000 6 Chapter 1 Introduction dee 7 Features aeniea a A R 7 GSM cellular MOSM apneic nn alinn 7 160550 compatible VART sen ai nn a GR 8 IA Saar ashes Mecha ahaha dae ihe hehe sheik ese 8 Mechafi al description ra 8 Connector ASSEN NN nnen 8 What comes with your board a00anrrrrrrerrrrn nr 9 Using IS tad eine etl atte em diate tact heel cade 9 Whenyo need NGI n na a anna 9 Chapter 2 Board settings 0000eeeee 10 Factory configured jumper settings eeeeeeerrrrn ner 11 Bas OOS SS JUNO CUS estate ced a ki A AA 12 Host interrupts ns heat et ese ra eae teeta 14 Chapter 3 Board installation seee 15 BOAre INSTANAN OMe ceeeicds sedi aa a ected tacts 15 General purpose digital I O connector ceeeeeeeeeeeeeeeeeeeseteeeeeeeeees 16 SOU CONG NO ia a i E 17 Chapter 4 Hardware description ccccccceeeees 19 The GSM wireless modem MOUIE cceeeeeeeeeeeeeeeeteeeeeeeeeeeeeeee 20 GSM antenna considerations ccceceeeeeeeeeeeeeeeeeeneeeeeeeeeeeeeeeeeeaaees 20 sl 0 ss sn 21 WAR sef ala 21 BONER FA 0 RN are ore A A ENTER ge 22 GSM
21. ions Users are reminded of the necessity to comply with restrictions regarding the use of radio devices in fuel depots chemical plants and locations where explosives are ignited 3 ELECTRONICS IN MEDICAL APPLICATIONS Radio transmitters such as the GSM35 can interfere with the operation of inadequately protected medical devices Please address all questions to a doctor or manufacturer of the medical device 4 PRECAUTIONS IN THE EVENT OF LOSS THEFT OF GSM35 AND SIM CARD If your GSM35 SIM card or both go missing notify your network operator immediately in order to avoid misuse GSM35 3 RTD Finland Oy User s Manual Revision History 05 04 2002 HW Release 1 0 Preliminary version released CE Conformity of TC35 cellular engine e 89 336 EC EMC Directive e 73 23 EC Low voltage directive e 91 263 EC telecommunications terminals directive Standards e EMC ETS 300 342 1 e Safety EN60950 e GSM Network TBR 19 TBR 20 Notice We have attempted to verify all information in this manual as of the publication date Information in this manual may change without prior notice from RTD Finland Oy Published by Real Time Devices Finland Oy Lepolantie 14 FIN 00660 Helsinki Finland Copyright 2002 Real Time Devices Finland Oy All rights reserved Printed in Finland PC XT PC AT are registered trademarks of IBM Corporation PC 104 is a registered trademark of the PC 104 Consortium The Real Time Devices Logo is a re
22. ler Interrupt Mask Register IMR Each bit in the interrupt mask register IMR contains the mask status of the interrupt line If a bit is set equal to 1 then the corresponding IRQ is masked and it will not generate an interrupt If a bit is cleared equal to 0 then the corresponding IRQ is not masked and it can then generate an interrupt The interrupt mask register is programmed through port 21h End of Interrupt EOI Command After an interrupt service routine is complete the 8259 Interrupt Controller must be acknowledged by writing the value 20h to port 20h What exactly happens when an interrupt occurs Understanding the sequence of events when an interrupt is triggered is necessary to correctly write interrupt handlers When an interrupt request line is driven high by a peripheral device such as the GSM35 the interrupt controller checks to see if interrupts are enabled for that IRQ It then checks to see if other interrupts are active or requested and determines which interrupt has priority The interrupt controller then interrupts the processor The current code segment CS instruction pointer IP and flags are pushed onto the system stack and a new set if CS and IP are loaded from the lowest 1024 bytes of memory This table is referred to as the interrupt vector table and each entry to this table is called an interrupt vector Once the new CS and IP are loaded from the interrupt vector table the processor starts t
23. o execute code from the new Code Segment CS and from the new Instruction Pointer IP When the interrupt routine is completed the old CS and IP are popped from the system stack and the program execution continues from the point where interruption occurred GSM35 26 RTD Finland Oy User s Manual Using Interrupts in your Program Adding interrupt support to your program is not as difficult as it may seem especially when programming under DOS The following discussion will cover programming under DOS Note that even the smallest mistake in your interrupt program may cause the computer to hang up and will only restart after a reboot This can be frustrating and time consuming Writing an Interrupt Service Routine ISR The first step in adding interrupts to your software is to write an interrupt service routine ISR This is the routine that will be executed automatically each time an interrupt request occurs for the specified IRQ An ISR is different from other sub routines or procedures First on entrance the processor registers must be pushed onto the stack_before anything else Second just before exiting the routine you must clear the interrupt on the GSM35 by writing to the Status register and write the EOI command to the interrupt controller Finally when exiting the interrupt routine the processor registers must be popped from the system stack and you must execute the IRET assembly instruction This instruction pops the CS I
24. oard jumper fields VO interfaces The GSM35 can be controlled and monitored from the software through two dedicated I O registers A special I O connector is available for the user to connect to the general purpose TTL level digital I O Mechanical description The GSM35 is designed on a PC 104 form factor An easy mechanical interface to both PC 104 and RTD IDAN systems can be achieved Stack your GSM35 directly on a PC 104 compatible CPU module using the onboard mounting holes and standoffs Connector description The GPS and GSM antenna interfaces use an OSX type miniature coaxial connector Connect your antenna directly to the GSM35 antenna connectors or use a short cable inside your enclosure to connect to a feed through connector to allow connection of the antennas to the wall of your enclosure All I O connections are made using header type terminals GSM35 8 RTD Finland Oy User s Manual What comes with your board Your GSM35 package contains the following items e GSM35 board e User s manual Note Device drivers and example software available on our website If any item is missing or damaged please send an EMAIL to Real Time Devices Finland sales service department at Internet address lt sales rtdfinland fi gt Note that RTD Finland also can offer a GSM35 starter kit that will include an active antenna with ready cables for direct evaluation and testing of this module The part number for this starter kit i
25. of the GSM35 The antenna should be connected to the TC35 using a flexible 50 Ohm antenna cable In IDAN installations the antenna connection is brought to the front side of the IDAN frame The antenna used should meet the following specifications Frequency 890 910MHz TX 935 960MHz RX Impedance 50 Ohms VSWR 1 7 1 TX 1 9 1 RX Gain lt 1 5dB references to 1 2 dipole 1W power cw max 2W peak at 55 degrees Centigrade GSM35 7 RTD Finland Oy User s Manual A SIM card socket is located on the solder side of the module The card can only be removed while the TC35 has been placed in shutdown mode The GPRS35 is also available using the MC35 GPRS Modem It supports all the features of the GSM35 and on top the advantages of the fast GPRS technology The MC35 based GPRS modem GPRS35 is available now During the 3Q 2002 RTD Finland will also release a triple band GPRS module that will operate in the 1900MHz band The part number will be GPRS45 Engineering samples will be available in August 2002 16C550 compatible UART Communication to the GSM35 board is performed through a standard UART channel This onboard serial port leaves the other system serial ports free for the user All operating systems will recognize and support this 16C550 standard UART and therefore no special communication drivers are needed to receive data from your GSM35 board The address and interrupt of your serial channels can be individually set with the onb
26. ol reg Bit 7 0 RXD Only if control reg Bit 7 0 BAUD div Low Only if control reg Bit 7 1 BAUD div High Only if control reg Bit 7 1 IRQ enable Only if control reg Bit 7 0 IRQ ID Line control Modem control Line status Modem status Digital I O GSM status GSM control BASE 400 BASE 402 BASE 403 Digital I O port Configuration registers Power control Table 5 1a General I O map of the GSM35 UART 23 RTD Finland Oy User s Manual BASE 400 Digitall O R W This address is used to interface to the digital I O port of the GSM35 writing to this address will transfer the data out of the output port while reading from this address will return the data from the digital inputs BASE 402 GSM Status R W 0x00 after reset Write Bit 0 RESERVED Bit 1 EN_INT 0 UART interrupt enabled 1 disabled Bit 2 RESERVED Bit 3 RESERVED Read Bit 0 EN_RST state Bit 1 EN_INT state Bit 2 TEMP_LOW 1 Board temperature below 20C Bit 3 TEMP_HIGH 1 Board temperature over 70C BASE 403 GSM Control R W 0x00 after reset Write Bit 0 Ignition signal 1 gt 0 results in IGN signal Bit 1 Powerdown of the TC35 1 Power down 0 Power on Bit 2 RESERVED Bit 3 RESERVED Read Bit 0 Ignition signal state Bit 1 Powerdown of the TC35 state Bit 2 RESERVED Bit 3 RESERVED GSM35 24 RTD Finland Oy User s Manual Starting up and logging into the GSM network
27. pter 3 BOARD INSTALLATION The GSM35 GSM modem module is designed to directly mount on top or under your RTD PC 104 cpuModule stack This chapter tells you step by step how to install your GSM35 into your system Board installation Keep your board in its antistatic bag until you are ready to install it to your system When removing it from the bag hold the board at the edges and do not touch the components or connectors Please handle the board in an antistatic environment and use a grounded workbench for testing and handling of your hardware Before installing the board in your computer check the power cabling Failure to do so may cause the power supply unit to malfunction or even cause permanent damage General installation guidelines e Touch the grounded metal housing of your computer to discharge any antistatic buildup and then remove the board from its antistatic bag e Hold the board by the edges and install it in an enclosure or place it on the table on an antistatic surface e Install your board in your system and wire the power supply correctly Failure to do so may cause the power supply unit to malfunction or even cause permanent damage to the device e Check all wiring connections once and then once more again e Connect the SIM card and the GSM antenna to the OSX connector on the GSM35 board e Apply power to your system GSM35 15 RTD Finland Oy User s Manual ANTENNA _ CELLULAR MODE UMNO a e ee GSM3
28. s SK GSM35 Using this manual This manual is intended to help you install your new GSM35 module and get it working quickly while also providing enough detail about the board and it s functions so that you can enjoy maximum use of it s features even in the most demanding applications When you need help This manual and all the example programs will provide you with enough information to fully utilize all the features on this board If you have any problems installing or using this board contact our Technical support department at lt techsupport rtdfinland fi gt When sending us an Email request please include the following information Your company s name and address your name your telephone number and a brief description of the problem GSM35 9 RTD Finland Oy User s Manual Chapter 2 BOARD SETTINGS The GSM35 board has jumper settings which can be changed to suit your application and host computer configuration The factory settings are listed and shown in the diagram at the beginning of this chapter Make sure you completely study and understand this chapter before making changes to these settings GSM35 10 RTD Finland Oy User s Manual Factory Configured Jumper Settings Table 2 1 below illustrates the factory jumper setting for the GSM35 Figure 2 1 shows the board layout of the GSM35 and the locations of the jumpers The following paragraphs explain how to change the factory jumper settings to suit your
29. s a GSM35 27 RTD Finland Oy User s Manual call to the same DOS function X then function X is essentially being called while active Such cases will cause the computer to crash DOS does not support such operations The general rule is that do not call any functions that use the screen read keyboard input or any file I O routines these should not be used in ISR s The same problem of re entrancy also exists for many floating point emulators This effectively means that you should also avoid floating point mathematical operations in your ISR Note that the problem of reentrancy exists no matter what programming language you use Even if you are writing your ISR in Assembly language DOS and many floating point emulators are not re entrant Of course there are ways to avoid this problem such as those which activate when your ISR ere Such solutions are however beyond the scope of this manual The second major concern when writing ISR s is to make them as short as possible in term of execution time Spending long times in interrupt service routines may mean that other important interrupts are not serviced Also if you spend too long in your ISR it may be called again before you have exited This will lead to your computer hanging up and will require a reboot Your ISR should have the following structure Push any processor registers used in your ISR Put the body of your routine here Clear the interrupt bit by reading GS
30. specific application Table 2 1 Factory configured jumper settings Please see figure 2 1 below for more detailed locations JUMPER NAME DESCRIPTION NUMBER OF JUMPERS FACTORY SETTING BASE Base Addresses 6 2E8 6E8 IRQ Hostinterrupts tit1 5 G jumper closed e ww ee se eee SE Pies Bu Si ENS TESS nuaa in eis 100 27 7 We C 0682 M 5 I tt S WHITH S640 nad Oy e 200 Reol Time Devices Fi Fig 2 1 GSM35 1 Board layout showing jumper locations GSM35 11 RTD Finland Oy User s Manual Base address jumpers Factory setting 2E8h 6E8h The GSM35 is I O mapped into the memory space of your host XT AT The board occupies a consecutive memory window of 8 bytes starting from the base address for UART communication and 4 consecutive bytes starting from BASE 400h for the board control and status registers As an example if your base address is set to be 2E8h for the serial port the onboard control registers will start from 6E8h The most common cause of failure when you are first setting up your module is address contention some of your computers I O space is already occupied by other devices and memory resident programs When the GSM35 attempts to use it s own reserved memory addresses which are being already used by another peripheral device erratic performance can occur and the data read from the board may be corrupted To avoid this problem make sure you set
31. up the base address by using the six jumpers on the right side of the board this allows you to choose from a number of different addresses in your host computer s I O map Should the factory installed settings be incompatible to your system configuration you may change this setting to another using the options illustrated in Table 2 2 overleaf The table shows the jumper settings and their corresponding values in hexadecimal form Ensure that you verify the correct location of the base address jumpers When the jumper is removed it corresponds to a logical 0 connecting the jumper to a 1 When you set the base address of the module record the setting inside the back cover of this manual GSM35 12 RTD Finland Oy User s Manual GSM35 Base address configuration BASE A8 A7 A6 A5 A4 A3 BASE A8 A7 AG AS A4 A3 200 000 0 0 300 00 0 0 0 A 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 aye st OO Ol OlOlO O O O O O O O O O 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 i 0 0 0 0 0 _ l oO s s s O O O O O O o o s s s s s O O O O O o o o _ _ A1dlololo ala alojoloso a ja a ojololo a ja alojojlo w MO 00 PIPVIVINVIPVIPV Y DIPVINIVIPVIPVIVIN IPVINIPVIPVIPVININVIPVIVIVININY m OC O O Q 0 J CO C0 CO NI NI Od Od 1 C1 BN A 09 CO DO PO o d0 S 0 0 OG G0 O C0 G C0 GO Co GO Co
32. y following this procedure 1 Read the limited warranty which follows 2 Contact the factory and request a Returned Merchandise Authorization RMA number 3 On a sheet of paper write the name phone number and fax number of a technically competent person who can answer questions about the problem 4 On the paper write a detailed description of the problem with the product Answer the following questions Did the product ever work in your application What other devices were connected to the product How was power supplied to the product What features did and did not work What was being done when the product failed What were environmental conditions when the product failed 5 Indicate the method we should use to ship the product back to you e We will return warranty repairs by UPS Ground at our expense e Warranty repairs may be returned by a faster service at your expense e Non warranty repairs will be returned by UPS Ground or the method you select and will be billed to you 6 Clearly specify the address to which we should return the product when repaired 7 Enclose the paper with the product being returned 8 Carefully package the product to be returned using anti static packaging We will not be responsible for products damaged in transit for repair 7 Write the RMA number on the outside of the package 8 Ship the package to Real Time Devices Finland Oy Lepolantie 14 FIN 00660 Helsinki FINLAND 3
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