SAM The GSM / GPRS STAND ALONE MODEM 2W User Guide Wavecom Instruments Pty Ltd 257 Grange Road Findon, South Australia 5023 Phone: (+61) 08 8243 3500 Fax: (+61) 08 8243 3501 Email: office@wavecom.com.au Website: www.wavecom.com.
Contents 1. 2. 3. 4. 5. 6. 7. 8. Overview Safety Precautions Radio frequency exposure - SAR WEEE directive 2002/96/EC Packaging Functionality a. b. c. d. e. General The RJ45 connector The Data cable The SIM holder The LED status a. b. Preparation Setting up Operation Electrical characteristics a. b. c. d. e. 9. Power supply RF band External antenna Temperature Conformity A typical application - Remote meter reading 10.
The Stand Alone modem, SAM, is designed to be a compact modem, easy to use for both mobile and fixed machine to machine applications. It has an RJ45 socket for serial data and input power, an FME male antenna connector, a SIM holder and an LED indicator. The SAM is a Quad-band 850/900/1800/1900MHz GSM/GPRS modem, capable of Circuit Switched Data, Packet Switched data, SMS and Fax. The RJ45 socket includes an RS232 serial port and input voltage signals.
3. Radio frequency exposure - SAR The SAM2W modem is a low-power transceiver, similar to a typical handheld GSM/GPRS mobile phone. When it is turned on, it will emit low-level radio frequency energy. There are different guidelines and standards around the world that govern the permitted levels of radio frequency exposure for general population. The levels include a safety margin to a human body.
. Packaging The SAM package consists of : - A SAM modem A data cable A one-page Specification of the SAM and its pinouts A SAM2W User Guide The carton box diameter is 120mm x 95mm x 60mm The Data cable is 2m long The Label diameter is 50mm x 33mm Wavecom Instruments Pty Ltd t +61 3 9239 2000 Grange Road f +61 257 3 9561 2614 Findon, South Australia 5023 e Phone:.intercel.com.au (+61) 08 8243 3500 Toll free number for Fax: (+61) 08 8243 3501 Email: office@wavecom.com.au Website: www.wavecom.com.
. Functionality a. General The SAM modem is a Quad band 850/900/1800/1900MHz GSM/GPRS modem. It consists of an RJ45 connector for serial port and input power, an FME male antenna connector and a SIM holder. The LED located near the SIM holder indicates the SAM operating status.
b. The RJ45 connector Pin Signals Description 1 2 3 4 5 6 7 8 VIN DCD DTR GND RXD TXD RTS CTS Input voltage 5Vdc - 32Vdc Data Carrier Detect Data Terminal Ready Common Ground Serial Data out of the SAM Serial Data into the SAM Ready to Send Clear to Send Wavecom Instruments Pty Ltd t +61 3 9239 2000 Grange Road f +61 257 3 9561 2614 Findon, South Australia 5023 e Phone:.intercel.com.au (+61) 08 8243 3500 Toll free number for Fax: (+61) 08 8243 3501 Email: office@wavecom.com.au Website: www.wavecom.
c. The Data cable The data cable is 2m long. It consists of an RJ45 plug, a DB9-female connector and a 2-wire input power.
The SIM holder The SIM holder takes the 3V mini SIM card only. To insert the SIM card, remove the door by sliding it back toward the end.
7. Operation a. Preparation Before power up the SAM, make sure the SIM card is inserted, the antenna is connected properly and the data cable is in place. The default factory setting for the SAM is : - Terminal Data speed : 115200bps Data format : 1 start bit, 8 data bits and one stop bit, no parity Flow control : RTS/CTS hardware flow control After the SAM is powered up, wait until the LED starts flashing before issuing any AT command. b.
c. How to : - Send an SMS in text mode : AT+CMGF=1 Set TEXT mode AT+CSCA? Check Service centre address AT+CMGS= Destination phone number Enter text here, ends with to send +CMGS: 44 Text message is sent OK - Receive an SMS in Text mode +CMTI: “SM”,4 AT+CMGR=4 - Make an outgoing data call ATDn...
8. a. Power supply : GSM850/900 GSM1800/1800 Maximum Input current @ 5V Power=33.10dBm GSM850/900 During 2Tx bursts @ Pcl5 @ 13.2V Power=33.0dBm DCS1800/1900 During 2Tx bursts @ Pcl0 @ 32V 2.1A 1.88A 1.4A 1.1A 610mA 390mA Average Input current @ 5V Power=33.10dBm GSM850/900 Average 3Rx/2Tx @ Pcl5 @ 13.2V Power=33.
The recommended dual-band or quad-band antenna used with the SAM should have the c. following characteristics : - Frequency range : Quad band GSM 850/900/1800/1900MHz Impedance : 50Ω VSWR : Rx Max = 1.5 : 1, Tz Max = 1.5 : 1 Typical radiated Gain : 0dBi d. Temperature : - Operating temperature : -20ºC to +55ºC Storage temperature : -25ºC to 70ºC e. Conformity : - Safety standard : EN60950 Efficient use of radio spectrum : EN301 419 (Ver 4.1.1) EN301 511 (Ver 7.0.
9. In this application, the SAM2W modem is connected to an electricity meter, which is located at a remote site, and the area is covered by the GSM/GPRS network. At the office, the Operator is equipped with a computer, connected to a landline (PSTN) modem, or another SAM2W modem. To read the remote meter, the Operator uses the computer and the connected modem, and calls the SAM2W at the remote site.
a. The modem does not respond to AT command - Check power supply : The input voltage must be from 5Vdc to 30Vdc. The supply current must be capable of 1.7A @ 5Vdc Check the serial data cable : Make sure the serial data cable is configured correctly according to the diagram on section 6.c above Check that the terminal program on your PC is configured correctly : communication port, data speed, data format, flow control. Check that there is no conflict on the selected serial communication port. b.
d. - Check the antenna : proper connection, correct 50 Ω type, correct frequency range 850/900/1800/1900MHz. - Check Rx signal strength : Use AT+CSQ to check the Rx signal strength. General rule of thumb, signal greater than 12 is sufficient. e. Care and maintenance The GSM modem is an advanced piece of engineering equipment and should be treated with care. The suggestion below will help to prolong the modem’s life: - Do not expose the modem to extreme temperature and/or high humidity.
a. Norminal antenna gain EGSM-900 Tx Frequency in MHz Max power density S=f/200 (W/m²) DCS-1800 Min Max Min Max 880 915 1710 1785 4.575 8.550 8.925 4.400 Power to the antenna (W) 2 2 1 1 Norminal antenna gain dB 0 0 0 0 Norminal antenna gain G 1 1 1 1 Distance from the antenna to POI : R=[(PG/4πS)]½ 19.02cm 18.65cm 9.65cm 9.44cm APPENDIX A : SAR CALCULATIONS FOR THE SAM2W b.
Appendix B SAR STATEMENT FOR THE SAM2W CE-CERTIFICATION APLLICATION To whom it may concern The SAM2W is a GSM/GPRS modem, that sends/receives data over the GSM/GPRS network. This modem is designed for Machine-to-Machine applications. This modem does not have an integral antenna. Depending on customers’ requests, the SAM2W modem may/may not be supplied with an antenna. In the cases of customers wanting to acquire the antennas themselves, the antenna specification is included in the User Guide.
