G20_User Guide_V1.04
Contents
1. 30 8 Software Firmware Upgrade e eee eee eee eee ee eoo etes eese sess ss ete ette eese sese aste eee 30 SL UO isene it en reed anse di ie dde ao naiss sue 30 8 2 Illustration of software upgrade ss 30 2 8 A Related 0 38 B Terms 001107 38 C Safety 40 G20 User Guide V1 04 4 2013 5 20 SYS www sysembed com Table Index TABLE 1 G20 key features nunnana E A S 8 TABLE 2 The consumption in sleep mode 15 TABLE 3 The power line assignment rre He Per oaa E ea rri ege 15 TABLE 4 9 pole D sub female RS232 eee 17 TABLE 5 Signal assignment of 10 line cable 19 TABLE 6 Audio output Characteristics 000 eee 20 TABLE 7 AT CMIC Change the Microphone Gain Level 20 TABLE 8 AT CLVL Change the Speaker Volume Level 21 TABLE 9 ADC specification 22 TABLE 10 AT CADEC E RE 22 TABLE 11 AT SGPIO Control the GPIQ teo tien rm teh e iaai ava eniinn anse 23 TABLE 12 Antenna specifications scusa ena ep aa p ane hg de RR ER CREE SR RR VR NR CRETA SR CENE CREE Caused SR Rea gg 24 TABLE 13 Status of the NETLIGHT indicator Green 25 TABLE 14 AT CSDT Switch On or Off Detecting SIM Card ss 26 TABLE 15 Absolute maximum ratings ss 28 TABLE 16 Recommended operating conditions ss 29 TABLE 17 The ESD characteristics Temperature 25 C Humidity 452. sesesseeeeeeeeeeeeeeeeeeee 29 TABLE 18 Operating frequency EE 29 TABLE 19 Transmitter output power and receiver Sensitivity 30 TABLE 20 Related Bee tee 38 TABLE 21 Terms and abbreviations 38 TABLE 22 Safety Caution eerte teen tor e n ee io eo ee ra i eto a aana eanan 40 G20 User Guide V1 04 5 2013 5 20 SYS www sysembed com Figure Index FIGURE E E TE H FIGURE 2 Mechanical dimensions of G20 Unit mm 10 FIGURE 3 Installation of the modem ss 11 FIGURE 4 G20 interface Front View e rtt REESE PIS ER EE RN PEORES RENE PEINE RET 12 FIGURE 5 G20 interlace Back Iesse eege ege eege deed ee 12 FIGURE 6 G20 functional diagram sise 13 FIGURE 7 Accessory informati n teen rennen eerte testet 097 14 FIGURE 8 Dimensions of power line Unit mm 15 FIGURE 9 Power interface 16 FIGURE 10 Pin assignment RS232 D sub 9 pole female 16 FIGURE 11 COM port properties of the hyper terminal ss 18 FIGURE 12 Signal assignment of 10 PIN I O port 18 FIGURE 13 Dimension of 10 line cable ss 19 FIGURE 14 Audio reference 010111 E 20 FIGURE 15 Antenna interface 24 FIGURE 16 Indicator LED E 25 FIGURE 17 Installation of SIM card see 27 FIGURE 18 Reset timing tenter NEES EENS vd NEE 28 FIGURE 19 Reset button 28 FIGURE 20 Main UN 31 FIGURE 21 Parameter e 32 FIGURE 22 Browse the source file 32 FIGUR
3. 50uS Mirc 5 NRESET 1 Vin gt 24V i gt 4 1 D Figure 18 Reset timing Note It is recommended to cut off the power supply directly instead of using reset button when the modem can not respond Reset button 6 Figure 19 Reset button 7 Electrical Reliability and Radio Characteristics 7 1 Absolute maximum ratings The absolute maximum ratings stated in following table are stress ratings under non operating conditions Stresses beyond any of these limits will cause permanent damage to G20 Table 15 Absolute maximum ratings Symbol Parameter Min Typ Max Unit VBAT Power supply voltage 4 5 16 V v Input voltage 0 3 3 1 V ni Input current 10 mA io Output current 10 mA These parameters are for digital interface pins such as GPIO UART and DEBUG G20_User Guide_V1 04 28 2013 5 20 SYS 7 2 Recommended operating conditions Table 16 Recommended operating conditions Symbol Parameter Min VBAT Power supply voltage 5 Toper Operating temperature 40 Tsrc Storage temperature 45 7 3 Electro Static discharge www sysembed com Typ 425 Max 85 490 Unit G G20 is an ESD sensitive component so more attention should be paid to the procedure of handling and packaging The ESD test results are shown in the following table Table 17 The ESD characteristics Temperature 25 C Humidity 45 Test item Shell RF interface RS232 interface Audio interface SIM card holder
4. 8 2 Illustration of software updating Open the tools the main operation interface as the figure 20 shows G20_User Guide_V1 04 30 2013 5 20 www sysembed com SIESO0 Series download Tools Customer 1 6 Regie f Figure 20 Main UI Configure the download parameter G20 User Guide V1 04 31 2013 5 20 www sysembed com Port Baud Rate Download ption ReadBufferSize LONE ON v 115200 J Normal DN 2048 D embedapp cla cer 00000000 Size Figure 21 Parameter setting Browse the source file CiU SERIAL Download Target Baud Rate DownloadDption ReadBufferSi re reco rl da DN 115200 dded 2048 Download File Core File Po o 21 Click to browse the core Tino B been Ssie E 2 Click to browse the App Ye qm file that SIMCom 00580000 Sire mie Erase Type Erase User Data and Code Figure 22 Browse the source file Modem setup Before click the Start Download make sure that the modem is off and connect the modem G20_User Guide_V1 04 32 2013 5 20 SYS www sysembed com to PC by RS232 interface Figure 23 Connect to PC by RS232 interface without power up Software download Click the button Start Download then the window will change like the following figure shows G20_User Guide_V1 04 33 2013 5 20 www sysembed com SIES00 Series download Tools Customer 00 00 000 2012
5. Response SGPIO 0 1 1 12 0 2 0 1 OK Parameters See Write Command Response OK ERROR Parameters lt operation gt 0 Set the GPIO function including the GPIO output and GPIO as the keypad 1 Read the GPIO level Please note that only when the GPIO is set as input user can use parameter to read the GPIO level otherwise the module will return ERROR lt GPIO gt The GPIO you want to be set It has relations with the hardware please refer to the hardware manual 23 2013 5 20 SYS www sysembed com function Only when operation is set to O this option takes effect 0 Set the GPIO to input Set the GPIO to output Set the GPIO to keypad Set the GPIO low level Set the GPIO high level lt level gt LU 6 4 Antenna interface 6 4 1 Antenna connector Antenna connector allows transmission of radio frequency RF signals between the modem and the external supplied antenna The G20 modem is fitted with a 509 male SMA connector Figure 15 Antenna interface 6 4 2 Antenna specifications The antenna is a very important component in the system Since the antenna transmits and receives electromagnetic signal and its efficiency depends on the antenna s type placement and the environment of the antenna operating The recommended antenna specifications are showed in Table 12 Table 12 Antenna specifications Frequency range GSM 850 900 1800 1900 MHz Impedance 50 ohm Input power gt
6. Contact discharge 10KV 10KV 10KV 10KV 10KV 7 4 Operating frequency Air discharge 15KV 15KV 15KV 15KV 15KV The operating frequencies in GSM850 EGSM900 DCS PCS modes are conform to the GSM Specifications shown as bellow Table 18 Operating frequency Mode Freq TX MHz GSM 850 824 849 890 915 880 890 DCS 1800 1710 1785 PCS 1900 1850 1910 EGSM 900 G20 User Guide V1 04 869 894 935 960 925 035 1805 1880 1930 1990 29 Freq RX MHz Channels A RFC 128 251 0 124 975 1023 512 885 512 810 TX RX offset 45MHz 45MHz 45MHz 95MHz 80MHz 2013 5 20 SYS www sysembed com 7 5 Transmitter output power and receiver sensitivity The G20 s conducted transmitter output power and receiver sensitivity are shown as bellow Table 19 Transmitter output power and receiver sensitivity Mode Power dBm Sensitivity dBm GSM 850 33 108 EGSM 900 33 108 DCS 1800 30 107 PCS 1900 30 107 8 Software Firmware Upgrade The software can be upgraded via the RS232 interface with the help of tools provided by SYSTECH 8 1 Tool introduction The tool name is 511900 Series download Tools Customer 1 6 which runs on the windows OS customers can upgrade software conveniently by it This tool is a single road download tool one modem can be upgraded by it every time SYSTECH also provides multi road download tools for customer s factory use Contact SYSTECH sales for support
7. Data Set Ready Request To Send Clear To Send Ring Indication Note G20 supports autobauding autobauding allows G20 to automatically detect the baud rate of the host device User can use AT command AT IPR x to set a fixed baud rate and the setting will be saved to non volatile flash memory automatically After the configuration is set as fixed baud rate the URC such as RDY CFUN 1 and CPIN READY will be reported when G20 is powered on Hyper terminal usually as the PC software tool to operate G20 customer can set up a connection between PC and modem configure the port properties as the figure 11 shows G20_User Guide_V1 04 2013 5 20 SYS www sysembed com COMI Properties 3 Pott Settings Bits per second 115200 v Data bits 8 v Parity None v Stop bits 1 v Flow contro Hardware vw Restore Detaults Figure 11 COM port properties of the hyper terminal 6 3 10 PIN I O interface G20 provides a 10 PIN I O interface for customer use including Audio GPIOs and 1 ADC channel The following figure gives a brief view of signal assignment MICN SPKN ADC GPIO GPIO 2 4 mice SPKP GND GPIO 1 3 Figure 12 Signal assignment of 10 PIN I O port To make the usage conveniently G20 provides a cable for customer it can be inserted to the 10 G20_User Guide_V1 04 18 2013 5 20 SYS www sysembed com PIN T O port so customer can develop their application by
8. Figure 4 G20 interface Front view SIM card holder Push button Reset button 6 Figure 5 G20 interface Back view Note For the I O interface SYSTECH could provide 4 line cable and 10 line cable optional to assist developers it will be introduced at the following chapter 5 2 G20 functional diagram The following figure shows a functional diagram of G20 and typical accessories G20_User Guide_V1 04 12 2013 5 20 www sysembed com Application circuit Figure 6 G20 functional diagram 5 3 Accessory information G20 User Guide V1 04 13 2013 5 20 www sysembed com Figure 7 Accessory information A G20 Modem B GSM Antenna C Male to Female DB9 Line D 6V Adapter E Two kickstands Optional F 10 line cable Optional G 4 line power line Optional 6 Application Interface 6 1 Power supply Customer can use the DC adapter that SYSTECH provides as the power source If customer does not use the adapter then DC source should be satisfied with the following requirements Input voltage range 5 16V Normal voltage 6V Q Current ability 2A G20_User Guide_V1 04 14 2013 5 20 SYS www sysembed com Table 2 The consumption in sleep mode G20 5V 12V 15V Sleep current 14 5mA 7 15mA 5 02mA The following chapter introduces the power line that SYSTECH provides to customers customer can power the modem by connect the modem to the DC source via this line The power line includes four lines
9. Level Test Command Response AT CMIC CMIC list of supported lt channel gt s list of supported lt gainlevel gt s OK Parameters See Write Command G20_User Guide_V1 04 20 2013 5 20 SYS www Sysembed com Read Command AT CMIC Write Command AT CMIC lt channel gt lt gain level gt Example Response CMIC lt channel0 gt lt gainlevel0 gt lt channeln gt lt gainleveln gt OK Parameters See Write Command Response OK ERROR Parameters channel 0 Main audio handset channel gain level gt Int 0 15 0 DN FW H ra GA E e nk D AT CMIC 0 10 OdB 1 5dB 3 0dB 4 5dB 6 0dB 7 5dB 9 0dB 10 5dB 12 0dB 13 5dB 15 0dB 16 5dB 18 0dB 19 5dB 21 0dB 22 5dB This command used to set the modem MIC gain level to 15 0dB Table 8 AT CLVL Change the Speaker Volume Level AT CLVL Loud Speaker Volume Level Test Command AT CLVL G20_User Guide_V1 04 Response CLVL list of supported lt level gt s OK If error is related to ME functionality 21 2013 5 20 SYS Read Command AT CLVL Write Command AT CLVL lt level gt Reference GSM 07 07 13 6 3 2 ADC channel CME ERROR lt err gt Parameter See Write Command Response CLVL lt level gt OK If error is related to ME functionality CME ERROR lt err gt Parameter See Write Command Response OK If error is related
10. connecting some devices 1000 3 10 Figure 13 shows the specification of the cable Figure 13 Dimension of 10 line cable Table 5 Signal assignment of 10 line cable Connecting diagram PI Wire color and cutting Modem signal length Signal name UO Command 1 Green MIC I 2 Yellow SPK O 3 Black GND Ground 4 Orange GPIOI T O Configurable by AT 5 Brown T GPIO3 commands 6 White MIC I 7 Gray SPK O 8 Red ADC I 9 Purple GPIO2 T O Configurable by AT 10 Blue GPIO4 commands 6 3 1 Audio interface G20 has one pair of audio input and audio output it can be connected to a handset directly G20_User Guide_V1 04 19 2013 5 20 SYS www sysembed com Handset Figure 14 Audio reference circuit Table 6 Audio output characteristics Parameter Conditions Min Typ Max Unit RL 32 Q 91 mW THD 0 1 RL 32 Q 96 mW THD 1 Normal Output swing 1 1 Vpp Output SPK Voltage single ended Output swing D Vpp Voltage differential Customer can set the modem MIC gain level to make the sounds louder so that the listener can hear more clearly And if the sound a little lower on the modem side customer can use the AT CLVL to make the sound higher so that customer can hear clearly The AT commands should be send to the modem by RS232 interface and the following table shows the detail commands Table 7 AT CMIC Change the Microphone Gain Level AT CMIC Change the Microphone Gain
11. to 115200bps Can be used for AT commands data stream Support RTS CTS hardware handshake and software flow control Multiplex ability according to GSM 07 10 Multiplexer Protocol Autobauding supports baud rate from 1200 bps to 57600 bps GSM 11 14 Release 99 Size 98 60 22mm Weight 125g Firmware upgradeable by RS232 interface G20 does work at this temperature but some radio frequency characteristics may deviate from the GSM specification 3 Modem Dimensions G20 User Guide V1 04 9 2013 5 20 SYS www sysembed com Figure 2 Mechanical dimensions of G20 Unit mm 4 Installation The modem can be fixed by two kickstands Optional that provided by SYSTECH the following figure is the illustration G20 User Guide V1 04 10 2013 5 20 www sysembed com Figure 3 Installation of the modem 5 Interface Introduction 5 1 Overview G20 Modem provides the following connectors for power supply GPIOs Audio ADC Serial port and antenna The GSM antenna interface SMA type female connector 6 The 4 PIN 1 0 port for power supply 6 The 10 PIN I O port for audio GPIOs and ADC The standard RS232 interface 6 LED indicator for power RED and GSM netlight Green SIM card holder Reset button G20_User Guide_V1 04 1 2013 5 20 SYS www sysembed com 4 PIN for 10 PIN LO Audio Power and mr connector Power and Netlight LED Standard RS232 PL and A Es interface included interface interface
12. to ME functionality CME ERROR lt err gt Parameter www Sysembed com lt level gt 0 100 Integer type value with manufacturer specific range smallest value represents the lowest sound level Note G20 provides an auxiliary ADC which can be used to measure the voltage User can use AT command AT CADC to read the voltage value Table 9 ADC specification Parameter Voltage range ADC Resolution Sampling rate Note The maximum voltage that the ADC can gather is 2 8V Min Typ Table 10 AT CADC Read ADC AT CADC Read ADC Test Command G20_User Guide_V1 04 Response 22 Max 2 8 200K Unit bits Hz 2013 5 20 SYS AT CADC Read Command AT CADC www sysembed com CADC list of supported lt status gt s list of supported lt value gt s OK Parameters status 1 Success 0 Fail lt value gt Integer 0 2800 Response CADC lt status gt lt value gt OK Parameters See Test Command 6 3 3 GPIO interfaces G20 provides 4 GPIO pins The output voltage level of the GPIO can be set by the AT command AT SGPIO The input voltage level of the GPIO can also be read by the AT command AT SGPIO The following table shows the detail commands about GPIO Table 11 AT SGPIO Control the GPIO AT SGPIO Control the GPIO Test Command AT SGPIO Write Command AT SGPIO lt operation gt lt GPI O gt lt function gt lt lev el gt G20_User Guide_V1 04
13. 08 26 11 04 41 Q9 ov 00000 7 Opened COMM port o0 007000 Power On Reset Target Figure 24 Click download button without power up When the status window shows Power On Reset Target powering up the modem by connecting the DC source G20_User Guide_V1 04 34 2013 5 20 www sysembed com Figure 25 Power up the modem Upgrade in proceeding G20_User Guide_V1 04 35 2013 5 20 www sysembed com SIG900 Series download Tools Customer 00 117828 Index Ox70000 Frame size Figure 26 Upgrade in proceeding Finish upgrading Now the software is the new version click Exit to finish upgrading customer can check the software version by AT GSV G20_User Guide_V1 04 36 2013 5 20 www sysembed com SIESO00 Series download Tools Customer App File 0 T9OOROL DING ST 1137BO1VDIT9OONE4 ST App cla v pe Erase User Data and Code y n 100 E D oe 467859 Erase Sign block complete 6005 467859 Start to write Sign byte to the sign block 05 477047 Write Sign byte to the sign block successfully OS 417041 Download complete Q os 477047 2012 06 28 11 13 24 Figure 27 Finish upgrading G20_User Guide V1 04 37 2013 5 20 SYS Appendix A Related Documents Table 20 Related documents SN Document name SIM900_AT Command Manual AN_SIM900_TCPIP SIM900_Multiplexer User Manual_Application Note AN_SIM900_AUDIO AN_
14. 1 02 Add GPIOs Joe Chen 2012 12 15 V1 03 Add short circuit protection Joe Chen 2013 5 20 V1 04 Modify accessory information Monya Li G20_User Guide_V1 04 3 2013 5 20 SYS www sysembed com Contents 1 7 2 Key Features 00 esee sese 7 3 Modem Dimensions e eee eee e eee enn eoe teh eese n eet sess eese ess sese eese sese eese esee essa eese e 9 A 1511110 Soon ess sens esc deassteontess eite 10 5 Interface Introduction ccccsssccccssssccccssssscccccssscccccsscscccccscccccccssccccccssccccccsssscceeess 11 Sel 11 5 2 20 EE 12 5 3 Accessory information c en arent aer EP std m e tee Pene eech Ee r 13 6 Application 14 0 1 Power M 14 6 2 Serial 16 6 3 10 PIN T O 18 0 3 D Audio AMC EE 19 22 6 3 3 GPIO RE 23 6 4 ds ane RON RENE RROA 24 64 1 Antenna Connector eege 24 042 Antenna specifications eed erc epe rupe re pev Re ee Ee 24 6 4 3 Antenna placement 25 OIEMESBELMICIOC REESE 25 66 SIM card MI eebe 25 OD MM NIS ec 27 7 Electrical Reliability and Radio Characteristics ccccccssssssscccccccscccccssssssssccscceseees 28 TA Absolute MAXIMUM PANES re are Pere nant stands 28 7 2 Recommended operating conditions ss 29 7 3 Electro St tic discharge ttr e e ER eed eed eddie e 29 LA Ee E E UE E 29 7 5 Transmitter output power and receiver sensitivity
15. 33dBm 2W peak power in GSM G20_User Guide_V1 04 24 2013 5 20 SYS www sysembed com VSWR recommended sz VSWR absolute max gt 1 Gain lt 3dBi 6 4 3 Antenna placement The antenna performance is very easily influenced by other electronic devices So the antenna placement should be considered carefully as follow 1 Place away from other electronic devices or other antennas 2 Place far away from metal material 3 Face the base station antenna directly if the signal strength is very weak 6 5 LED indicator A red led indicates the power status when a valid power appears the red led will lighten up But a lighten up red led does not mean that the modem has been powered up A green led indicates the modem status and GSM net status after the modem been powered up and registered to the network it will blink at a certain frequency Figure 16 Indicator LED Table 13 Status of the NETLIGHT indicator Green Status G20 behavior Off G20 is not running 64ms On 800ms Off G20 not registered the network 64ms On 3000ms Off G20 registered to the network 64ms On 300ms Off GPRS communication is established 6 6 SIM card interface G20_User Guide_V1 04 25 2013 5 20 SYS www sysembed com The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2 specification for FAST 64 kbps SIM card Both 1 8V and 3 0V SIM card are supported The SIM interface is powered from an internal regulator inside th
16. 6 ADC function 7 Short circuit protection www sysembed com Implementation 5V 16V Typical power consumption in sleep mode is 70mW BS PA MFRMS 9 G20 Quad band GSM 850 EGSM 900 DCS 1800 PCS 1900 G20 can search the 4 frequency bands automatically The frequency bands also can be set by AT command AT CBAND Compliant to GSM Phase 2 24 Class 4 2W at GSM 850 and EGSM 900 Class 1 1W at DCS 1800 and PCS 1900 GPRS multi slot class 10 default GPRS multi slot class 8 option Normal operation 30 C 80 C Restricted operation 40 C 30 C and 80 C 485 C Storage temperature 45 C 90 C GPRS data downlink transfer max 85 6kbps GPRS data uplink transfer max 42 8kbps Coding scheme CS 1 CS 2 CS 3 and CS 4 Integrate the TCP IP protocol Support Packet Broadcast Control Channel PBCCH Support CSD transmission Unstructured Supplementary Services Data USSD support MT MO CB Text and PDU mode SMS storage SIM card Group 3 Class 1 Support SIM card 1 8V 3V SMA type RF connector Speech codec modes Half Rate ETS 06 20 Full Rate ETS 06 10 Enhanced Full Rate ETS 06 50 06 60 06 80 Adaptive multi rate AMR Echo Cancellation 8 2013 5 20 SYS RS232 serial port SIM Toolkit Physical characteristics Firmware upgrade www sysembed com Noise Suppression Serial port Full modem interface with status and control lines unbalanced asynchronous 1200bps
17. E 23 Connect to PC by RS232 interface without power up 33 FIGURE 24 Click download button without power up ss 34 FIGURE 25 Power up the E 35 FIGURE 26 Upgrade in proceeding nen en enne ennt nnne 36 FIGURE 27 Finish ppgradime iier etre th REOR ERE RERO Ee TR REESE EES 37 G20 User Guide V1 04 2013 5 20 SYS www sysembed com 1 Introduction This document describes features functions and interfaces of G20 modem in great detail G20 is a Quad band GSM GPRS modem that works on frequencies of GSM 850MHz EGSM 900MHz DCS 1800MHz and PCS 1900MHz which is a ideal solution for wireless M2M application the modem features GPRS multi slot class 10 8 optional and supports the GPRS coding schemes CS 1 CS 2 CS 3 and CS 4 With the help of this document user can understand G20 interface specifications electrical and mechanical quickly Figure 1 G20 overview RoHS Note The G20 Modem is fully complying with RoHS requirements of European standards 2 Key Features G20 modem has the following features 1 Standard AT commands set 2 SIMO900 proprietary AT commands set G20 User Guide V1 04 7 2013 5 20 SYS Table 1 G20 key features Feature Power supply Power saving Frequency bands Transmitting Power GPRS connectivity Temperature range Data GPRS CSD USSD SMS FAX SIM interface External antenna Audio features G20_User Guide_V1 04 3 Watch dog function 4 Voice call 5 GPIOs
18. SIM900_Audio LINE IN input SIM900_Embedded AT Application Note AN_ Serial Port SIM900_Serial Update Tool UGD ITU T Draft new recommendation V 25ter GSM 07 07 GSM 07 10 GSM 07 05 GSM 11 14 GSM 11 11 GSM 03 38 GSM 11 10 B Terms and Abbreviations www sysembed com Remark SIM900 AT Command Manual TCP IP Applications User Manual SIM900 Multiplexer User Manual Application Note Application Note About SIM900 Audio Application Note About SIM900 LINE IN Input SIM900 Embedded AT Application Note Application Note About Serial Port Update Tool User Manual Serial asynchronous automatic dialing and control Digital cellular telecommunications Phase 2 AT command set for GSM Mobile Equipment ME Support GSM 07 10 multiplexing protocol Digital cellular telecommunications Phase 2 Use of Data Terminal Equipment Data Circuit terminating Equipment DTE DCE interface for Short Message Service SMS and Cell Broadcast Service CBS Digital cellular telecommunications system Phase 2 Specification of the SIM Application Toolkit for the Subscriber Identity Module Mobile Equipment SIM ME interface Digital cellular telecommunications system Phase 2 Specification of the Subscriber Identity Module Mobile Equipment SIM ME interface Digital cellular telecommunications system Phase 2 Alphabets and language specific information Digital cellular telecommunications system Phase 2 Mob
19. SYS HERH G20_User Guide_V1 04 AW gt y j Solution Application Note Datasheet www sysembed com General Notes SYSTECH offers this information as a service to its customers to support application and engineering efforts that use the products designed by SYSTECH The information provided is based upon requirements specifically provided to SYSTECH by the customers SYSTECH has not undertaken any independent search for additional relevant information including any information that may be in the customer s possession Furthermore system validation of this product designed by SYSTECH within a larger electronic system remains the responsibility of the customer or the customer s system integrator All specifications supplied herein are subject to change Copyright This document contains proprietary technical information which is the property of SYSTECH copying of this document and giving it to others and the using or communication of the contents thereof are forbidden without express authority Offenders are liable to the payment of damages All rights reserved in the event of grant of a patent or the registration of a utility model or design All specification supplied herein are subject to change without notice at any time Copyright Systech 2012 G20 User Guide V1 04 2 2013 5 20 SYS www sysembed com Version History Date Version Description of Change Author 2012 11 18 V1 01 Add reset Joe Chen 2012 12 5 V
20. as the following figure shows and table 3 gives a detailed description Table 3 The power line assignment PIN Number Color Item 1 white NC p red Power 3 yellow NC 4 black Ground Figure 8 Dimensions of power line Unit mm G20 User Guide V1 04 15 2013 5 20 SYS www sysembed com Figure 9 Power interface When a valid power appears the modem will power up automatic for the MCU that inside the modem processed the power up part MCU also acts as a Watch Dog when the modem runs wrong MCU will cut off the power and recover it immediately to restart the modem 6 2 Serial interface G20 provides one asynchronous RS232 serial port female The RS232 standard interface serves to connect a PC Data Terminal Equipment DTE or other application which acts as host controller of the G20 modem with all its functions Through the RS232 interface it can be used as GSM GPRS modem for sending and receiving of SMS Data and Fax calls Ee 8 7 6 Figure 10 Pin assignment RS232 D sub 9 pole female G20_User Guide_V1 04 16 2013 5 20 SYS Table 4 9 pole D sub female RS232 Pin no Signal name 1 DCD 2 RXD 3 TXD 4 DTR GND DSR RTS CTS RI NOM SCH EM Wes EH ECH Ke www sysembed com Function Data Carrier Detected Receive Data Transmit Data Data Terminal Ready Attention The ignition of G20 modem is activated via a rising edge of high potential 3 15V Ground
21. e modem G20 support SIM card hot plug which means that the modem can sense the SIM card inserted in or drawn out when the module is on AT command AT CSDT is used to enable or disable SIM card detection function For details of this AT command please refer to the following table Table 14 AT CSDT Switch On or Off Detecting SIM Card AT CSDT Switch On or Off Detecting SIM Card Test Command Response AT CSDT CSDT 0 1 OK Parameter See Write Command Read Command Response AT CSDT CSDT lt mode gt OK Parameter See Write Command Write Command Response AT CSDT OK lt mode gt ERROR Parameter lt mode gt 0 Switch off detecting SIM card 1 Switch on detecting SIM card Note When the detecting function is activated the status of SIM card will auto report via the serial port The sensing of a hot removal of the SIM is not supported during power saving mode AT CFUN 4 G20_User Guide_V1 04 26 2013 5 20 www Sysembed com Caution the edge of the SIM card Push button to pull out the holder Caution the holder direction Figure 17 Installation of SIM card 6 7 Reset The RESET button is used to reset the modem The function is used as an emergency reset only when the modem has no effect The RESET button could be pulled down to reset the modem The reset timing is illustrated in the following figure G20_User Guide_V1 04 27 2013 5 20 SYS www sysembed com Min 20uS Typ
22. ile Station MS conformance specification Part1 Conformance specification Table 21 Terms and abbreviations Abbreviation ADC AMR AT G20 User Guide V1 04 Description Analog to Digital Converter Adaptive Multi Rate Attention commands 38 2013 5 20 www sysembed com 2013 5 20 39 G20_User Guide_V1 04 SYS www sysembed com Q n E 5 gt gt Q 5 5 5 ec 5 D n 5 gt gt S S 5 5 EN 2013 5 20 www sysembed com G20_User Guide_V1 04 41 2013 5 20 SYS www sysembed com Contact us SYSTECH Address 702 Block A Tsinghua Hi Tech Park Nanshan Shenzhen China Tel 400 993 9390 Fax 86 755 2603 0411 Post code 518057 www sysembed com G20_User Guide_V1 04 42 2013 5 20
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