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6 

Using GPS 

Read this chapter if you wish to use the GPS features of your modem. Your modem 
supports both standalone GPS and Assisted-GPS. It can provide either simple 
positioning data including longitude, latitude, and altitude, or it can provide more detailed 
NMEA (National Marine Electronics Association) data. This chapter explains how to set 
the modem up to use its GPS features. 

 

The modem supports several different GPS options. Before discussing GPS commands 
we will discuss the different GPS modes so you can decide which mode is best for your 
application. 

 

GPS vs Assisted GPS Mode 

 

Traditional GPS or standalone GPS relies solely on GPS satellites to determine its 
position. 

Assisted GPS (A-GPS)

 uses both the cellular network and the GPS satellites 

to determine its location. A-GPS can significantly reduce the time it takes to lock onto 
the satellites to figure out your position. This is known as 

time to first fix

 

(TTFF).

 When 

satellite interference is a problem, such as in urban areas where tall buildings can 
obstruct and redirect signals, or where poor weather conditions prevent the signal from 
reaching the modem, A-GPS is more reliable than standalone GPS. The downside of 
A-GPS is it requires a data connection to the cell network and can incur data charges. 
Standalone GPS relies solely on the GPS satellites, so no data costs are incurred and 
the modem does not even need to have a SIM card installed. 
 
Model 4575/4576 supports A-GPS through 

Mobile Station Based (MSB)

 positioning 

using the user plane protocol. In this mode, the modem receives current information 
about the orbital data of the GPS satellites quickly over IP from the network. It then uses 
this data to lock onto the GPS satellite to determine the modem’s location.   
 
Selection of GPS or A-GPS is done using the 

AT^WPDOM 

command. Setting 

AT^WPDOM=0 

sets the modem for standalone GPS mode. To use the modem in 

A-GPS mode set 

AT^WPDOM=5

. If you are using A-GPS, you have the option to set 

 

38

Содержание 4575

Страница 1: ...Model 4575 4576 Cellular Modem U S E R M A N U A L ...

Страница 2: ...operly in all environments and applications and makes no warranty or representation either expressed or implied with respect to the quality performance merchantability or fitness for a particular purpose of the software or documentation The manufacturer reserves the right to make changes to the hardware software and documentation without obligation to notify any person or organization of the revis...

Страница 3: ...S Messages 24 Using PDU Mode to Send SMS Messages 24 Receiving an SMS Message 35 Deleting a Text Message from Memory 36 USING GPS 38 GPS vs Assisted GPS Mode 38 XTRAOne Mode 39 GPS vs GNSS Positioning 39 Positioning Data vs NMEA Data 39 Setting the Modem up for GPS 40 Using Standalone GPS 41 Using Assisted GPS 42 Using NMEA Data 44 USING THE MODEM S HEADER 45 Serial Port Lines 47 Power Lines 48 US...

Страница 4: ...interesting topics covered in this manual For details about Model 4575 and 4576 hardware including power specifications and details about the modem s input output ports please see the Model 4575 datasheet at www zoomtel com 4575 Because Model 4575 and 4576 use the PTCRB certified Huawei MU609 LGA module you can also find a lot of useful information from Huawei s documentation including information...

Страница 5: ...installing your cellular antennas you must first screw the two metal antenna wires into the antenna bases Next screw the 2 antennas into the SMA connectors labeled Main and Aux as shown in Figure 1 If your unit did not come with cellular antennas or if you want to use your own cellular antennas they should meet the specifications shown in Chapter 8 Hardware Specification If you are using GPS screw...

Страница 6: ...support Unzip the file and store it in a folder on your desktop 2 Inside that folder double click on DriverInstall exe to install the USB driver The driver installs in the background in roughly 30 seconds If the This program might not have installed correctly dialog box appears you can ignore this message and click This program installed correctly 3 Plug one end of a USB cable into the USB port of...

Страница 7: ...o the Internet you need to set up a Dial up connection To setup a connection follow the steps for your OS Window 7 Go to the Control Panel Network and Sharing Center and click on Setup a New Connection Windows 8 1 8 From the charms bar select Settings Control Panel Network and Sharing Center and click on Setup a New Connection Windows 10 From the Start button select Settings Network and Internet D...

Страница 8: ...ems use a 3FF SIM card which is typically called a micro SIM The modem supports 1 8v and 3 0v SIM cards and will automatically detect which type you are using If you plan to use your modem in extreme temperature conditions we recommend that you get a SIM card rated for industrial temperatures Compatible SIM cards can be obtained from either AT T T Mobile or other providers that offer service compa...

Страница 9: ...l possible If 900 Mhz Band 880 960 MHz 1800 Mhz Band 1710 1879 MHz 1900 Mhz Band 1850 1990 MHz 2100 MHz Band 1920 1980 and 2110 2170 MHz These frequ frequencies supported by the modem you are sure you are not using certain frequencies then you may omit them when selecting your antenna Gain 2 5 dBi Polarization Vertical Radiation Pattern Omni directional Impedance 50 Ω VSWR 2 1 Antenna Efficiency 5...

Страница 10: ...the Modem s header Power connector shown in Figure 1 ou also have the option of supplying Y If you prefer to use the modem s header DON T USE THE POWER CUBE AT THE SAME TIME For more information about using the modem s header to power the modem please see Chapter 7 Using the Modem s Header for more information 10 ...

Страница 11: ... to Using the USB port with Windows based machines to learn how to use the USB port with Windows Using the Serial port with Windows based computers If you have not already plugged in a serial cable between your windows device and the modem please do that now If you want to use the modem s header to access the serial port please see Chapter 7 Using the Modem s Header To talk to the modem you typica...

Страница 12: ...the modem If you need an INF file to make dial up networking work you can download one from www zoomtel com 4575support Using the USB port with Windows based machines To use the modem s USB port for Windows computers you must first install the USB driver Installing the USB Driver 1 Download the Windows USB driver for your modem from www zoomtel com 4575support Unzip the file and store it in a fold...

Страница 13: ...ontrol the modem using AT commands and to monitor the status of the modem when using the ECM port To find the USB port number for this port go to Device Manager and look at Ports The port labelled Huawei Mobile Connect Control Interface is used for GPS AT command interaction as well as receiving positioning data back from the modem If you want to receive NMEA positioning data use the Huawei Mobile...

Страница 14: ...Using the Modem s Header To talk to the modem you typically set your com port speed to the modem s default speed of 115200 bps If your application requires the modem to use a different serial port speed you will need to set the modem up to use this speed Changing the serial port speed is done using the AT IPR command The format of the AT IPR command is AT IPR speed Where speed is the desired seria...

Страница 15: ...M driver or the USB Serial driver The CDC ECM driver allows you to send Ethernet over USB If you are using Kernel 3 9 or later you can use the CDC MBIM driver the CDC ECM driver or the USB serial driver The CDC MBIM Mobile Broadband Interface Module is an interface that was specifically designed for mobile broadband devices To find more information about modifying the built in Linux drivers to mak...

Страница 16: ... built in IP stack refer to Chapter 4 Establishing a Data Connection To learn how to use your modem with SMS messaging refer to Chapter 5 Using SMS Messaging To learn how to use your modem for GPS refer to Chapter 6 Using GPS To learn about your modem s header refer to Chapter 7 Using the Modem s Header 16 ...

Страница 17: ...internal protocol stack or using ECM dialing If you are connected to the modem with a serial port either through the modem s DE 9 connector or through the modem s header you can establish a data connection by using either an external protocol stack or the modem s internal protocol stack You may want to use the external protocol stack if your application already supports TCP IP UDP or if this suppo...

Страница 18: ... Broadband you enter the following command AT CGDCONT 1 IP Broadband The modem should respond OK Next verify that the modem is registered and attached by entering the command AT CGATT The modem should respond CGATT 1 OK If the modem responds with CGATT 0 then it is not attached to the network and you must manually attach it by entering the command AT CGATT 1 Once your modem is registered it will s...

Страница 19: ...ady registered the modem will respond as follows CME ERROR The network has been opened already To check that the modem is registered and to find out the modem s IP address enter the following command AT IPINIT The modem responds with IPINIT 1 10 56 134 128 broadband 172 26 38 1 172 26 38 2 Where 10 56 134 128 is the IP address of the modem broadband is the APN and the last 2 IP addresses are the p...

Страница 20: ... been established already To set up a listening server for TCP data enter the following command AT IPLISTEN TCP 6010 In this example the modem is monitoring port 6010 for TCP data For more information about the AT IPLISTEN command please refer to the Huawei AT Command manual available at www zoomtel com 4575support Sending Data with your Modem Before you send data you need to open up the connectio...

Страница 21: ...ith IPSEND 1 To send data over the TCP port opened in the example above enter the following command AT IPSEND 2 TCP data to be sent Here 2 is the Link ID set up with the IPOPEN command and TCP data to be sent is the data If the data is transmitted successfully the modem responds with IPSEND 1 For more information about the AT IPOPEN and AT IPSEND commands please refer to the Huawei AT Command manu...

Страница 22: ... the command to connect to AT T s network using the Broadband APN is AT NDISDUP 1 1 Broadband The modem should respond with NDISSTAT 1 IPV4 For more information about the AT NDISDUP command please refer to the Huawei AT Command manual available at www zoomtel com 4575support 22 ...

Страница 23: ...ging confirm that your data plan supports it SMS is not always included with M2M data plans and often there is an extra cost to support SMS messaging Text vs PDU Modes Your modem is capable of sending SMS messages in both text and PDU modes Text mode is simpler to use bit it does not allow you to use different encoding methods for your message PDU mode supports different encoding methods giving yo...

Страница 24: ...ill return OK If you do not want to send the text message enter Esc to cancel the message Your modem will send the text message using the default SMS Center and encoding You can use the AT CSCA command to change the default SMS Center or use the AT CSCS command to change the default encoding For more information about these commands as well as the AT CMGF and AT CMGS commands please refer to the H...

Страница 25: ... be stored with the low nibble first as 70 For example the phone number 5551234567 consists of 5 octets These octets are 55 51 23 45 and 67 This phone number would be stored with the low nibble first for each octet 55 15 32 54 76 The PDU message itself consists of 2 parts The first part of the message contains the information about the Service Center Address SCA The second part of the message cont...

Страница 26: ...its so an F is sometimes added Storing the phone number with the low nibble first as explained above the SC phone number 13123149810 is expressed as 3121139418F0 The SC phone number 3123149810 is expressed as 1332418901 Now let s assume that we want to create an SCA parameter for a with international prefix number 13123149810 The Length is 2 plus the number of digits in 3121139418F0 for a total of...

Страница 27: ...cate SMS message 1 Tells the SC to reject a duplicate SMS message The Validity Period Format defines the format that the validity period parameter uses The validity period defines how long the SC considers the SMS message valid before it discards it The Validity Period Format is defined as Bit 4 Bit 3 0 0 Validity Period not used 1 0 Validity Period uses relative format 1 1 Validity Period uses ab...

Страница 28: ...ame SC that the message was sent by when replying to the SMS message This was originally implemented to allow the reply message to be charged to the original sender because it goes through the sender s service center If you plan on enabling reply path you should check with your carrier to ensure it is supported The Reply Path settings are 0 Reply Path is not enabled 1 Reply Path is enabled To crea...

Страница 29: ...phone number that receives your SMS message It has the format Length of Phone Number Number type Phone Number If the phone number has an odd number of digits than you should add an F to make it an even number For example 15551234567 would be entered as 5155214365F7 when storing the phone number with the low nibble first The number type is either 91 for a with international prefix number or 81 for ...

Страница 30: ...ines where on the receiving device the SMS message is delivered SIM NV or Terminal Equipment Request whether or not the message is automatically deleted after it s read Automatic Deletion is often used with notification messages Message type indication to alert the user to a waiting voicemail fax or email The settings of bits 7 4 determine the meaning of bits 3 0 Bits 7 4 Bits 3 0 000 Bit 4 set to...

Страница 31: ...ng indication is enabled Bit 2 Reserved value is 0 Bit 1 Bit 0 Message Type 0 0 Voice message waiting 0 1 Fax message waiting 1 0 Email message waiting 1 1 Message of unknown type waiting 1111 Data Coding Message class Bit 3 Reserved value is 0 Bit 2 Message encoding scheme 0 GSM 7 bit encoding default 1 8 bit encoding Bit 1 Bit 0 Message type indication 0 0 Class 0 message is displayed on the use...

Страница 32: ...t be delivered If the Validity Period Format is set for relative then the Validity Period is represented by 1 octet The value of the Validity Period when set to relative is defined in this chart Validity Period Value Validity Period 0 143 VP 1 x 5 minutes 144 167 12 hours VP 143 x 30 minutes 168 196 VP 166 x 1 day 197 255 VP 192 x 1 week For example a value of 176 decimal yields a value of 10 days...

Страница 33: ...When sent in GMS 7 bit format the message can be up to 160 characters When sent in 8 bit encoding the message length is 140 characters When sent in UCS2 the message length is 70 characters To be able to send 160 characters in GSM 7 bit into the 140 available octets you need to pack the 7 bit data into the 8 bit octet For example the word Hello in 7 bits would be Character 7 bit format H 1001000 a7...

Страница 34: ...0B91515521 4365F7 00 00 05 C8329B FD06 Sending the SMS message in PDU mode Now that we have figured out the SCA and TPDU of our SMS message we can go ahead and send it using the AT CMSG command The format of the command is AT CMSG length of TPDU 2 cr SCA TPDU ctrl Z In our example the TPCU is 01000B915155214365F7000005C8329BFD06 which is 36 characters long so we enter AT CMSG 18 The modem responds...

Страница 35: ...the modem has any unread texts If you want the modem to notify you of an incoming text use the AT CMNI 2 1 command When the modem receives a text it will notify your application with the CMTI SM index result code where SM stands for SIM and index is the location in the SIM memory For example CMTI SM 3 Tells you that the modem just received a text and it s stored on the SIM card in location 3 To re...

Страница 36: ...rom location 3 enter the following command CMGD 3 If you set the modem not to notify you of incoming messages or if you prefer to delete the incoming messages all at once you can use the AT CMGL command to list all the messages stored on the SIM For example enter the command AT CMGL all The modem returns a list of read unread sent and unsent messages that are stored on the modem CMGL 2 REC READ 15...

Страница 37: ...at have been read and have been sent enter the AT CMGD 1 2 This will delete messages 2 and 4 and will leave message 3 in storage To delete all messages in storage enter the command AT CMGD 1 4 This will delete all 3 messages 37 ...

Страница 38: ...sition This is known as time to first fix TTFF When satellite interference is a problem such as in urban areas where tall buildings can obstruct and redirect signals or where poor weather conditions prevent the signal from reaching the modem A GPS is more reliable than standalone GPS The downside of A GPS is it requires a data connection to the cell network and can incur data charges Standalone GP...

Страница 39: ...ing System GPS The second is the Russian based Global Navigation Satellite System GLONASS Your modem can use either the GPS system or both the GPS and GLONASS system combined When in standalone mode using both systems referred to as GNSS can increase the reliability and accuracy of your positioning data By default your modem is set up to use GPS only You can set your modem to use GNSS by entering ...

Страница 40: ...iled Dilution of Precision DOP and satellite tracking information for GLONASS satellites GLGSV Provides detailed information on the satellites in view including location and signal quality for GLONASS satellites NMEA data is transmitted over the GPS Interface port as described in Chapter 2 Installing your ZoomCell Modem To set up the commands and receive regular positioning data you can use either...

Страница 41: ...f the command is AT WPDFR number of positioning operations time interval in secs The default value is 65535 attempts in 1 second intervals or AT WPDFR 65535 1 Next we set the quality of service parameters on the modem with the AT WPQOS command The format of the command is AT WPQOS time limit horizontal accuracy The time limit setting is the amount of time the unit will spend searching for the sate...

Страница 42: ...uments are available at www zoomtel com 4575support Using Assisted GPS If you have not already installed your hardware you should do that now Please see Chapter 2 Installing your ZoomCell modem if you need help Assisted GPS A GPS requires you to have a SIM card installed and set up for your network If you are not already set up for your network please see Setting up your Modem for the Network Afte...

Страница 43: ...eporting Now we enter AT WPDGP to start the positioning The modem will now begin searching for satellites Once it locates the modem s position it will report it as follows POSITION 71 09762d 42 34636d 52m The first value is the longitude with positive values representing east of Greenwich UK and negative values representing west The second value is latitude with positive values representing north ...

Страница 44: ...A 2 2 4 2 2 1 0 2A GPGSV 2 1 08 13 27 050 23 15 65 047 21 18 53 303 26 20 53 094 20 76 GPGSV 2 2 08 21 63 257 17 05 05 102 24 45 150 29 00 202 7A GPGGA 174648 0 4221 036885 N 07103 481350 W 1 05 2 2 67 0 M 33 0 M 54 GNGNS 174648 0 4221 036885 N 07103 481350 W AN 05 2 2 67 0 33 0 6F GPVTG 0 0 T 0 0 M 0 0 N 0 0 K A 23 GPRMC 174648 0 A 4221 036885 N 07103 481350 W 0 0 136 7 281215 A 71 For a list of ...

Страница 45: ...low The pins are defined in the table below for Models 4575 and 4576 Pin Num Name I O Volts 1 DSR O 0 V On 1 8 V Off 0 V means Data Set Modem Ready 2 RTS I 1 8V to 25V High 25V to 6V Low High means Request To Send 3 CTS O 0 V On 1 8 V Off 0 V means Clear To Send 4 RING O 0 V On 1 8 V Off 0 V means Ring 5 Power Out O 3 92 V On 3 92V comes from a high power 45 ...

Страница 46: ..._IN_NOT I 1 8V to 7V High 0V to 6V Low This signal reaches the Huawei 609 through an inverter See Huawei Hardware Guide 12 WAKEUP_OUT_NOT O High impedance is normal 0 V Low Output is open drain output of N channel Mosfet inverter Pull this up to your logic s supply voltage to use this line When 0 volts Huawei Wakeup_Out is High 13 Ground 14 N C Nothing connects to this line 15 N C Nothing connects...

Страница 47: ...annel MOSFET Pull this up to your logic s plus power supply 30 DCD O 0 V On 1 8 V Off 0 V means Data Carrier Detect Serial Port Lines The 8 serial port lines typically interface to logic The header s RXD line is the Huawei module s TX after it goes through an open drain Mosfet N channel inverter Equipment using this line should pull the RXD line up to the equipment s logic supply When no data is f...

Страница 48: ...eceive proper power or the header s VIN_ENABLE pin is low VIN_ENABLE is pulled up to VIN through a 10K resistor on the modem board To bring VIN_ENABLE low consider using a N channel Mosfet VMID comes from the Huawei MU609 supplying 1 8 volts nominal VIN is the input to the modem s switching supply It connects through power inductors to the modem s power jack When the power jack is used a board con...

Страница 49: ... low This will cause the modem to reset Sleep Mode Lines WAKEUP_IN_NOT goes through a Mosfet inverter circuit to control the WAKEUP_IN Huawei input as discussed in the Hardware Guide The input impedance is 122K or more and it is driven with logic that runs off 1 8v to 5 volts A low input should be 6 volts or below and a high input should be 1 4 volts or above SLEEP_STATUS_NOT and WAKEUP_OUT_NOT ar...

Страница 50: ...8 Hardware Specifications This section contains detailed information about the modem s hardware specifications Dimensions Model 4575 50 ...

Страница 51: ...ng supply has about 90 efficiency and the vast majority of current typically goes into the Huawei module which is powered at 3 92 volts Please see the Huawei MU609 HSPA LGA Module Hardware Guide which shows current consumption in various states and which shows peak current of 2 5 amps and typical steady state current depending on what mode the Huawei module is in Roughly speaking the average curre...

Страница 52: ...you are not using certain frequencies than you may omit them when selecting your antenna Gain 2 5 dBi Polarization Vertical Radiation Pattern Omni directional Impedance 50 Ω VSWR 2 1 Antenna Efficiency 50 Can be 40 for less than 960 MHZ 50 for greater than 1710 MHz GPS Antenna Specification Requirement Frequencies supported 1574 42 MHz 1576 42 MHz Polarization RHCP Right Hand Circular Polarization...

Страница 53: ...ks when modem is receiving data over the RS232 port Pwr On when power supplied to modem Cell On Modem is connected by a dial up connection Blinking once Modem is registered to the network Blinking Twice No service available or modem is not registered to network Off Modem is not trying to register to network 53 ...

Страница 54: ... notice the many support options available from Zoom Please go to www zoomtel com techsupport From here you can register your router and or contact our technical support experts and or use our intelligent database SmartFactstm and or get warranty information US 617 753 0963 54 ...

Страница 55: ... encouraged to try to correct the interference by one of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help The device complies with Part 15 of the FCC Rul...

Страница 56: ... exposure limits set forth for an uncontrolled environment This equipment should be installed and operated with minimum distance 20cm between the radiator your body This transmitter must not be co located or operating in conjunction with any other antenna or transmitter 0806 A 27721 2016 56 ...

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