VEGA INSYS Modem User Manual

Manual

INSYS GPRS 5.0 serial

Aug-07

Any duplication of this manual is prohibited. All rights on this documentation and the devices are with INSYS MICROELECTRONICS GmbH Regensburg.

Restrictions of guarantee This handbook contains a concise description. The compilation of the text has been made

with the utmost care. Despite all efforts, there may be deviations compared with the actual functions. No guarantee can therefore be given for the accuracy of the contents. We can neither take over a legal responsibility nor any liability for incorrect information and their consequences. Suggestions for improvements and comments are gladly accepted.

Trademarks The use of a trademark not shown below is not an indication that it is freely available for

use.

MNP is a registered trademark of Microcom Inc.

IBM PC, AT, XT are registered trademarks of International Business Machine Corporation.

INSYS ® is a registered trademark of INSYS MICROELECTRONICS GmbH.

Windows™ is a registered trademark of Microsoft Corporation.

Publisher:

INSYS MICROELECTRONICS GmbH Waffnergasse 8 D-93047 Regensburg, Germany Phone: +49 (0)941/56 00 61 Fax: +49 (0)941/56 34 71 e-mail: insys@insys-tec.de Internet: http://www.insys-tec.de

Subject to technical changes as well as correction. Date: Aug-07 Item: 31-22-03.099 Version: 1.1 Language: EN

Contents

1 Scope of Delivery............................................................................................... 7

2 Function Overview ............................................................................................ 8

2.1 Application Example ........................................................................................................ 10

2.2 History .............................................................................................................................. 10

3 Utilization Notes.............................................................................................. 11

4 Mounting......................................................................................................... 12

4.1 Front Panel ....................................................................................................................... 12

4.2 Top .................................................................................................................................... 13

4.3 Bottom.............................................................................................................................. 13

4.4 HSComm GPRS ................................................................................................................. 14

4.5 Initial Operation............................................................................................................... 14

4.5.1

Installation ........................................................................................................................ 15

4.5.2

Driver installation............................................................................................................ 16

4.5.3

Entering the SIM PIN into the device ......................................................................... 17

4.5.4

Insert the SIM card .......................................................................................................... 18

4.5.5

Checking the settings..................................................................................................... 19

4.5.6

Check the field strength of the GSM signal.............................................................. 21

4.5.7

Set GPRS APN (Access Point Name) dial-in parameters ........................................ 22

4.5.8

Establishing a test connection ..................................................................................... 23

4.5.9

Connection to the application .....................................................................................28

4.6 Operating Modes ............................................................................................................. 29

4.6.1

Command Mode .............................................................................................................. 29

4.6.2

Connection mode ............................................................................................................ 29

5 Connection ...................................................................................................... 30

5.1 Logging into the GSM Network ....................................................................................... 30

5.2 TCP Transparent (GPRS Modem Emulation).................................................................... 34

5.2.2

Defaults.............................................................................................................................. 34

5.2.3

Settings for the leased line ...........................................................................................37

5.2.4

Settings for TCP Listen (incoming TCP connections).............................................. 39

5.2.5

Manual connection setup ............................................................................................. 41

5.2.6

Automatic connection setup (leased line)................................................................ 41

5.2.7

Connection acceptance.................................................................................................. 42

5.2.8

During the connection ...................................................................................................44

5.2.9

Termination ...................................................................................................................... 45

5.3 GSM Data Connection (CSD Call) ..................................................................................... 46

5.3.1

Connection setup ............................................................................................................ 46

5.3.2

Incoming connections.................................................................................................... 46

5.3.3

Termination ...................................................................................................................... 47

5.3.4

Connection to analogue modems............................................................................... 48

5.3.5

Connections to ISDN TAs ............................................................................................... 48

5.4 Direct GPRS Connection via PPP ...................................................................................... 48

5.4.1

GPRS APN (PDP context) ................................................................................................ 49

5.4.2

PPP authentification type.............................................................................................. 49

5.4.3

GPRS connection setup .................................................................................................. 49

5.4.4

GPRS connection termination...................................................................................... 50

6 Functions .........................................................................................................51

6.1 Access Control .................................................................................................................. 51

6.1.1

Password protection....................................................................................................... 51

6.1.2

Selective call answer....................................................................................................... 52

6.2 Establishing a Connection by Callback ............................................................................ 54

Aug-07

Contents

6.3 Defined termination of GPRS connections for incoming CSD calls ("CSDPRIO")............ 59

6.3.1

CSD priority with caller authentification.................................................................. 60

6.3.2

CSD priority without caller authentification ........................................................... 61

6.4 Automatic Logout and Login or Restart of the Device.................................................... 61

6.4.1

Automatic login at restart ............................................................................................ 62

6.4.2

Periodic Logout and Login or Restart of the Device ............................................... 62

6.5 Automatic SMS Processing .............................................................................................. 64

6.5.1

Activation .......................................................................................................................... 64

6.5.2

Reading interval............................................................................................................... 65

6.5.3

Syntax................................................................................................................................. 65

6.5.4

Access Protection............................................................................................................. 66

6.5.5

SMS storage locations.................................................................................................... 66

6.6 Manually Dispatching SMS .............................................................................................. 67

6.7 Digital Inputs and Potential-Free Outputs ...................................................................... 68

6.7.1

Automatic SMS dispatch via the switch input ........................................................ 68

6.7.2

Connection setup via switch input ............................................................................. 71

6.7.3

Transmitting the input states to another INSYS GPRS 5.0 serial (IO tunneling)

.............................................................................................................................................. 72

6.8 Remote configuration ...................................................................................................... 76

6.9 Firmware Update ............................................................................................................. 77

6.10 Virtual COM Port .............................................................................................................. 78

7 Short Description INSYS AT Commands...........................................................80

7.1 Overview .......................................................................................................................... 80

7.2 Availability/Storage......................................................................................................... 83

8 GPRS General................................................................................................... 84

8.1 Application Notes............................................................................................................. 84

8.1.1

GSM..................................................................................................................................... 84

8.1.2

GPRS.................................................................................................................................... 84

8.2 Network Design ............................................................................................................... 85

8.3 TCP Transparent ............................................................................................................... 86

8.4 IP Addresses/Accessibility................................................................................................ 87

8.4.1

Fixed IP address and VPN connection ........................................................................ 88

8.5 Data Rates ........................................................................................................................ 88

8.6 Quality of Service (QoS) ................................................................................................... 90

8.7 Delay Times ...................................................................................................................... 90

8.8 Calculation Examples for Data Transmission via GPRS................................................... 91

8.8.1

Application description..................................................................................................91

8.8.2

General data amount ..................................................................................................... 92

8.8.3

Calculation example....................................................................................................... 94

9 Sending SMS as Fax or E-mail..........................................................................96

9.1 SMS as Fax ........................................................................................................................ 96

9.2 SMS as E-Mail ................................................................................................................... 96

10 GPRS Dial-in Parameters.................................................................................. 97

11 FAQ .................................................................................................................. 98

12 Technical Data ...............................................................................................103

12.1 General 103

Aug-07 5

Contents

12.2 Mechanical Features ...................................................................................................... 103

12.3 Power Supply.................................................................................................................. 104

13 Connections, Display and Control Elements..................................................106

13.1 Serial Interface ............................................................................................................... 106

13.2 SIM card 107

13.3 Internal Design............................................................................................................... 108

14 Standards and Directives............................................................................... 109

15 International Safety Instructions .................................................................. 110

15.1 Safety Precautions ......................................................................................................... 110

15.2 Compliance with FCC Rules and Regulations ................................................................ 111

Aug-07

INSYS GPRS 5.0 serial Scope of Delivery

1 Scope of Delivery

Before you begin with the initial operation, please check if all accessories are included in the box.

 INSYS GPRS 5.0 serial  PC connection cable 9/9-pin (RS232 cable)  User Guide

Please contact your supplier if the content is not complete. Please also check the modem for shipping damage. Please also refer to your supplier if anything is damaged.

Please keep the packaging material for possible future shipping or storage.

Optional accessories

 GSM antenna:  Wall-mounted antenna, magnetic base antenna or patch antenna  CD-ROM with configuration software and manuals

Function Overview INSYS GPRS 5.0 serial

2 Function Overview

The INSYS GPRS 5.0 serial is a DIN rail device for industrial applications. It has a compact design, a robust plastic housing and offers the following characteristics:

 Quadband GSM engine for all four frequency ranges: 850 / 900 / 1800 / 1900

MHz (The INSYS GPRS 5.0 serial can be used worldwide)

Before using the INSYS GPRS 5.0 serial you should check the certifica-

tion requirements in the country of deployment, see Chapter 14.

 Integrated TCP/IP and PPP stack for transparent modem emulation via GRPS

(GRPS modem emulation)

 GSM services: GSM/CSD data connection, SMS, GPRS connection  Support for the virtual COM port driver VCOM from INSYS MICROELECTRONICS

GmbH

 Integrated TCP/UP stack for modem-compatible behavior with transparent

transfer of data from and to the serial interface (“TCP transparent”).

• Active dialing of IP addresses or domain names with TCP connections to a server

• Accepts TCP connections ("TCP Listen")

 Dedicated line function (leased line); design as CSD or TCP/IP possible; intelli-

gent re-dialing time-outs for TCP/IP cost cutting; configurable substitute access for redundant paths.

 Callback function for incoming calls; callback as CSD or “TCP transparent" pos-

sible

 Defined termination of GPRS connections for incoming CSD calls ("CSDPRIO")

 Access protection via phone number analysis (CLIP) for incoming CSD calls, in-

coming SMS, when starting a callback, and when the priority for CSD calls is set.

 Password protection for remote configuration and configuration via SMS

 Storage of the SIM card PIN enables automatic login into the GSM network af-

ter reset/restart

 Timer-controlled logout and login into the GSM network or restart of the de-

vice, to prevent undefined login states in the GSM network

 Automatic dispatch of a predefined SMS when the switch input is activated.  Advance switch input functionality: Connection setup and "IO tunneling"

(transmitting the input states via a TCP connection)

 Standard AT command set according to GSM 07.05 and GSM 07.07

 Extended AT command set (INSYS AT command for additional functions)

INSYS GPRS 5.0 serial Function Overview

 Automatic processing of incoming SMS for configuration or connection setup,

also during existing connections

 Firmware update of the µ controller (locally and remote)

 Integrated SIM reader and external SIM interface for 3V / 1.8 V SIM cards

 Hardware watchdog

 Extended data formats for the serial interface

 Hardware and software handshake at the serial interface

 Field strength of the GSM network, status display of the INSYS GPRS 5.0 serial

Function Overview INSYS GPRS 5.0 serial

Control center

Internet

GPRS

2.1 Application Example

Controller

GPRS 5.0 serial

2.2 History

Version

2.001

1.00

INSYS

Additional functions

• Redesign

• Further development:

• Accepts incoming TCP connections ("TCP

Listen"), replacement destinations for AutoDial

• Substitute access for TCP Leased Line

• Termination of GPRS connections for in-

coming CSD calls ("CSDPRIO")

• Software handshake at serial interface

• Automatic dispatch of an SMS via switch input

• Extensions:

• CSDPRIO without CLIP

• IO tunneling via TCP/IP

2.100

• Advanced IO functions: Connection setup and SMS dispatch triggered via second switch input

• PPP user name extended to 38 characters

• New baudrate 28800

INSYS GPRS 5.0 serial Utilization Notes

3 Utilization Notes

• This manual uses the symbol for especially important notes. Further notes will be marked accordingly.

• All factory settings are marked “default”.

• In Chapters 4.6 to 7 the description consists of two columns. Individual functions

are described on the left side. The according AT commands and the modem responses can be found in the right column.

Function description AT command

Example: Dialing IP 192.168.0.2 and port 1234 ATD192.168.0.2:1234

All AT commands start with the letters AT and end with a “Return” (Carriage Return - CR). AT commands can be entered in capital or small letters. The command is processed after the modem received a CR input.

• In the following, the used syntax is explained:

ATD AT command (font: Courier, bold) <expression> Input of a parameter

(font: Courier, bold)

[expression] Input of an optional parameter

(font: Courier, bold)

expression Response from the modem

(font: Italic)

Examples:

ATD<ip>:<port> Dialing the IP address <ip>:<port> ATD192.168.0.1:1234 Dialing the IP address 192.168.0.1 and

the IP port 1234

AT**CALLBACK=0,2,0 The phone number that was stored with

AT**CLIP2 is assigned the action “IP Call-

back”.

+COPS=<n>[,<format>,<oper>]

Select network provider and login AT+COPS=0 Select network provider automatically and

AT+COPS=4,2,26201 Select network provider (Vodafone) manu ally and lo gin

Mounting INSYS GPRS 5.0 serial

4 Mounting

4.1 Front Panel

INSYS

Power

Status

SIM

Connect

RX/TX

Signal

Reset

10 Base-T

Ant.

RS 232

GPRS

The INSYS GPRS 5.0 serial has five LEDs for the operating state:

Name

Color LED off

Power Green

Status Yellow

Connect Yellow

No supply voltage

GSM engine not logged into network

No connection is established

LED on

Supply voltage available

TCP connection to the remote terminal has been established

The connection to the remote terminal is established (Carrier detected)

LED blinks

Initialization phase

LED flashes

Slow flashing (100 ms on, 1900 ms off): INSYS

GPRS 5.0 serial logged into the GSM network

Fast flashing (100 ms on, 900 ms off): PPP

dial-up successful, IP address received from provider; in the operating mode "TCP Listen", this is the normal state

INSYS GPRS 5.0 serial Mounting

RX/TX (Receive /

Green

Transmit)

Signal Green

No data exchange

GSM signal (field strength) too low

Date is exchanged via the modem

Best GSM signal (field strength)

Blinking interval depending on GSM signal (field strength):

ON 25 .. 31 60 ms 23 .. 24 140 ms 21 .. 22 260 ms 19 .. 20 380 ms 17 .. 18 500 ms 15 .. 16 1000 ms 13 .. 14 OFF 0 .. 12, 99

4.2 Top

Terminal

GND

10...60 V DC

GND

Reset

GND

Input 1

Input 2

GND

supply

Power

Reset

Ext.

IN 1

IN 2

1 GND Ground 2 X1 Reserved 3 10..60V DC Power supply 10V - 60V DC

4 GND Ground 5 GND Ground 6 Reset Reset input 7 GND Ground 8 Input 1 Alarm input 1 9 Input 2 Alarm input 2

10 GND Ground

Meaning

4.3 Bottom

OUT 1-NC

OUT 1

OUT 1-NO

OUT 2-NC

OUT 2

OUT 2-NO

Terminal

Meaning

11 OUT1-NC Output 1 normally closed 12 OUT1 Output 1 13 OUT1-NO Output 1 normally open

14 OUT2-NC Output 2 normally closed 15 OUT2 Output 2 16 OUT2-NO Output 2 normally open

Mounting INSYS GPRS 5.0 serial

4.4 HSComm GPRS

The configuration of the INSYS GPRS 5.0 serial takes place via AT commands which are entered by a terminal program or a control program in the form of character sequences. For a simpler set-up, all basic functions of the INSYS GPRS 5.0 serial can be entered without knowing the individual AT commands and their parameters, using the configuration software HSComm GPRS.

The software can be installed on the operating systems Microsoft Windows 2000 and Microsoft Windows XP. A terminal window to enter commands directly is available.

In Chapter 5 - Connections - and Chapter 6 - Functions -, the HSComm GPRS or another terminal program can be used for the configuration. The AT commands can be directly entered into the HSComm GPRS at the menu item “Terminal”.

The HSComm GPRS checks the connected device during startup. By default, only those settings can be selected which are implemented in the identified device.

The buttons in the right column can be used to select the current settings, to restart (reset) the device, or to set the factory settings (default).

The current can be saved as a file at the menu item "File" in the main menu at the top window border, and reloaded at a later date.

The selected configuration of the parameters is only sent to the INSYS GPRS

5.0 serial after you click on the button Send values.

4.5 Initial Operation

INSYS GPRS 5.0 serial Mounting

4.5.1 Installation

Caution - Electric shock hazard

This section applies only to the initial startup of the device with factory settings.

1. Have the SIM card and the according PIN ready.

2. Install the device on a DIN rail.

Do not touch live parts when connecting the device.

Make sure that the power supply of the switch board or the system where the device will be installed is switched off during installation, and that it is secured against being switched on accidentally.

3. Connect the power supply.



First, connect the ground connection.

4. Connect a suitable power supply (10..60V DC).



Note: The minimum supply voltage value is 10V DC. The maximum supply voltage value is 60V DC.

5. Connect the antenna.



Use a suitable GSM antenna.



You can obtain suitable GSM antennas as accessories for this device from INSYS.

6. Switch the power supply on.



The power LED will light up.

7. Wait until the device has powered up.



The status LED blinks during the boot process.



The signal LED blinks when the process is completed.

Mounting INSYS GPRS 5.0 serial

8. Connect the device to the PC.



Connect the 9-pin jack at the device with the serial interface of your computer.

9. Install the configuration software HSComm GPRS and/or your terminal program.

10. Start the program HSComm GPRS on the PC.

11. Synchronize the serial interfaces of the PC and the INSYS GPRS 5.0 serial



At delivery, the serial interface settings of the INSYS GPRS 5.0 serial are as follows: 8 data bits, no parity, 1 stop bit, data rate 19,200 Bits/s.



To synchronize the interfaces in the Software HSComm GPRS, use the button "Synchronize RS232".

For the configuration, the settings of the serial interface of the PC and the

INSYS GPRS 5.0 serial must always be identical!

4.5.2 Driver installation

The installation of a driver is not required when using a terminal program or the software HSComm GPRS. When using another application, a driver may be necessary. Please find our current drivers at http://www.insys-tec.de/ or install the standard modem 336 under Windows.

INSYS GPRS 5.0 serial Mounting

4.5.3 Entering the SIM PIN into the device

1. Start the program HSComm GPRS.

2. Read out the settings.

3. Enter the PIN of the SIM card you are using.

4. Transmit the value to the INSYS GPRS 5.0 serial.



Use the button "Send values".

Mounting INSYS GPRS 5.0 serial

4.5.4 Insert the SIM card

Caution – Danger of short-circuit for your SIM card!

1. Disconnect the power supply.



2. Remove the SIM card holder.

A short-circuit may occur due to sliding contacts when the card is removed.

When inserting the SIM card, interrupt the supply voltage to prevent damaging the card when sliding it along the card reader contacts and creating a short-circuit.

The LEDs of the INSYS GPRS 5.0 serial will go out.



Press the sunken button (see image) above the SIM card holder using a pointed object and remove the card holder.

INSYS GPRS 5.0 serial Mounting

3. Insert the SIM card into the card holder.

4. Reinsert the SIM card holder into the SIM card reader.



Insert the card holder. The contacts of the SIM card must point to the left when looking at it from the front of the device.

5. Switch the power supply on.



The device will boot, the power LED will light up continuously, and the status LED will blink.

6. Wait until the boot process is completed.



The Status LED goes out which indicates that the boot process is completed.



The signal LED is blinking.

4.5.5 Checking the settings

1. Read out the settings.



Click on the button "Read settings" in the software HSComm GPRS.



A symbol next the entry field of the PIN will show, if the INSYS GPRS 5.0 serial has been registered.

Mounting INSYS GPRS 5.0 serial

INSYS GPRS 5.0 serial Mounting

4.5.6 Check the field strength of the GSM signal

2. Read out the GSM field strength.



Use the button "GSM field strength" in the HSComm GPRS.



The field strength is displayed.



The response should be a field strength of at least 12 – otherwise the antenna location needs to be changed to ensure faultless communication.

Mounting INSYS GPRS 5.0 serial

4.5.7 Set GPRS APN (Access Point Name) dial-in parameters

1. Click on the tab "TCP transparent" in the program HSComm GPRS.



see also Chapter 11 - GPRS Dial-in Parameters -

2. Enter the GPRS Access Point Name in the software HSComm GPRS.



Your mobile network provider will inform you about the name of your APN. Please find an overview of the APNs of some mobile network providers in the attachment to this manual.



For some network providers, PAP authentication is required. See also Chapter 10: Dial-in parameter.

INSYS GPRS 5.0 serial Mounting



If your provider requires PAP authentication, select the required field below the GPRS AN input field and enter the PAP user data.

3. Send the values to the INSYS GPRS 5.0 serial.



Use the button "Send values" in the program HSComm GPRS.

4. Perform a restart.



Use the reset key at the front of the device or disconnect the device from the power supply for a short time.

4.5.8 Establishing a test connection

To establish a test connection to another computer in the Internet, a terminal program will be required, e.g. TeraTerm. The program is included on the supplied CD, in the folder software. Alternatively, you may also use other terminal programs. The procedure described in this section, however, applies to the program TeraTerm only. This section will show how to establish a connection from the INSYS GPRS 5.0 serial to the http server of INSYS, and how to send the contents of a file.

1. Install the program TeraTerm

2. Start TeraTerm.

3. Configure the serial connection.



During the start phase of TeraTerm, you will be asked to configure a new connection.

4. Select "Serial" for a connection via a serial interface.

5. Select the serial interface, to which you connected the INSYS GPRS 5.0 serial.

Mounting INSYS GPRS 5.0 serial

6. Select the item "Serial port" in the TeraTerm menu under "Setup".

7. Set the connection parameters of the serial connection.



As default, the serial interface of the INSYS GPRS 5.0 serial is configured with the following parameters: Baud rate 19,200, 8 data bits, no parity, 1 stop bit If you did not change these settings in the INSYS GPRS 5.0 serial, use these parameters when configuring the serial interface of the PC.

8. Select the item "Terminal" in the TeraTerm menu under "Setup".

9. Configure the terminal behavior.

INSYS GPRS 5.0 serial Mounting

10. Test the serial connection to the INSYS GPRS 5.0 serial by entering the AT command "at" in the terminal window and confirming the entry with the "Enter" key.



If you don't see the characters at the terminal that you are entering, you most probably selected the wrong baud rate. Repeat step 6 and 7 to check and correct the connection paramaters.



The INSYS GPRS 5.0 serial will respond with "OK".

11. Prepare the following commands in a text editor such as "Notepad".

GET /1kb.txt HTTP/1.1 Host: www.insys-tec.de



Please consider case sensitivity.



Complete the entry of each line in the editor by pressing the Enter key one time.

Mounting INSYS GPRS 5.0 serial



Please note: For the subsequent entries in the terminal window, you will have a time window of about 20 seconds. Read the last step before you continue entering data.

12. Enter the following command in the terminal window of TeraTerm:

ATD“www.insys-tec.de“:80

13. Complete the entry by pressing the entry key.

The INSYS GPRS 5.0 serial will now establish a connection to the computer www.insys-tec.de.



The INSYS GPRS 5.0 serial responds with the status message "CONNECT" in the terminal window, if the connection was established successfully.



The status LED and the connect LED at the device light up.



During an established connection, any further keyboard inputs are no longer displayed in the terminal window.

14. Mark the commands in the editor and copy them to the clipboard.

INSYS GPRS 5.0 serial Mounting



Use the key stroke combination "Ctrl+C" to copy the marked text to the clipboard.

15. Copy the commands to the terminal window and complete your entry with "Enter".



To insert, use either the key stroke combination "Alt+V" or select the item "Paste" from the menu "Edit".



After a short waiting period, the contents of the file "1kb.txt" will be displayed in the terminal window.



After another short period the status message "NO CARRIER" will indicate that the remote computer has terminated the connection to the INSYS GPRS 5.0 serial.

Mounting INSYS GPRS 5.0 serial



If you cannot see the contents of the file 1kb.txt, but the following message, it has most probably taken you too long to enter it. The http server has terminated the connection with a timeout. An error message is displayed in HTML code format.



The message includes the HTML code of the side of the server for timeout errors.



To restart an attempt to establish a test connection, start with step 12.

4.5.9 Connection to the application

For the operation, the application settings and the settings of the INSYS

GPRS 5.0 serial for baud rate, data format and handshake must be identical.

Anwendung {{{PRODUKTBESCHREIBUNG}}}

INSYS GPRS 5.0 serial Mounting

<1 Sek.

Pause>

4.6 Operating Modes

4.6.1 Command Mode

4.6.1.1 Offline

The offline command mode is the state after the GSM/GPRS engine was booted and initialized, or after a reset of the {{{PRODUCT DESCRIPTION}}} . During the offline command mode the {{{PRODUCT DESCRIPTION}}} can be addressed via AT commands.

Note

Please note that in the operating mode "TCP List" not all AT commands may be used. See Chapters 5.2.7 and 7.

4.6.1.2 Online

The {{{PRODUCT DESCRIPTION}}} can be switched to online command mode during a data connection (CSD, GPRS, “TCP transparent”). After switching from data mode to online command mode, the connection will remain established, but no data is transmitted to the remote terminal. The online command mode is also entered by DTR drop (setting AT&D1) or by activating the reset input twice within 10 seconds.

Note: Terminating connections, see Chapters 5.2.9

- Connection termination - and 5.2.9– GPRS Connection termination -

4.6.1.3 Remote Note: See Chapter 6.8 "Remote Configuration"

4.6.1.4 SMS configuration Note: See Chapter 6.5 "Automatic SMS Processing"

4.6.2 Connection mode

+++ <1 Sek. Pause>

Depending on the connection type, the data is transformed unaltered from and to the application (CSD call, GPRS call) or processed by integrated TCP/IP stacks of the µcontroller (TCP transparent).

Connection INSYS GPRS 5.0 serial

5 Connection

Connection See

Chap.

TCP transparent (modem emulation)

CSD

GPRS direct (via PPP)

5.3 TCP/IP GPRS

5.3

5.4

Target Bearer Trigger

 AT command

GSM

Modem

ISDN

GSM

TCP/IP GPRS

GSM

 Incoming con-

nection request

 SMS

 Callback

 Leased Line

 Switch input

 AT command

 SMS

 Callback

 Leased Line

 Incoming call

 AT command

5.1 Logging into the GSM Network

To enable the device to log into the GSM network, the PIN of the SIM card must be entered in the device.

Click on the tab “Basic Settings”.

Note: see also Chap. 4.5 – Installation -

Automatic login (one-time configuration) Entering the PIN is only required for new devices or after the SIM card was

switched.

INSYS GPRS 5.0 serial Connection

Note

As default, the INSYS GPRS 5.0 serial will login to the strongest available GSM network.

In regions close to borders, registering into the desired network is not always successful. Manually selecting the exclusively preferred network will correct this problem.

In the first step, the display of all available network providers would be a plus.

Click on the desired network provider in the display. In our example, the available network provider is T-Mobile – correct description: T-Mobile D

The selected network provider is stored as the preferred network.

Connection INSYS GPRS 5.0 serial

Transfer the current settings to the INSYS GPRS 5.0 serial. Afterwards, the device must be reset. After the current settings have been read out, the INSYS GPRS 5.0 serial is registered.

If the device is preconfigured for another country, a search for the desired network provider will be useful.

In our example, we search for Vodafone in England (UK).

INSYS GPRS 5.0 serial Connection

Mark and then apply the selection.

Alternatively, the settings can be entered or modified using the terminal program.

Enter PIN

If manual network provider selection is required, the network provider identification number must be determined. You will find a chart for the INSYS GPRS 5.0 serial with identification numbers and names in the AT command overview – available at no charge from INSYS. In our example, the German network TMobile with the identification number 26201 is used.

Network provider selection for T-Mobile in Germany

Perform a RESET to use the PIN.

Manual registration after each reset

AT**PIN

AT**PROVIDER=2,1,26201

AT**RESET

If the module is started and logged in from an external application, this application may request a manual login. In this case, the following method should be used:

Enter the PIN (when the PIN is entered via

AT+CPIN=<PIN> this command, it must be re-entered for each reset).

Prompt manual registering (this command

AT+COPS=0 may trigger a waiting period of several seconds)

Connection INSYS GPRS 5.0 serial

5.2 TCP Transparent (GPRS Modem Emulation)

In this mode, user data is transmitted transparently via the serial interface and in TCP/IP packets via the GSM/GPRS network. The INSYS GPRS 5.0 serial will act like a conventional modem at the serial interface.

The remote terminal for this connection type receives the TCP/IP data and evaluates them directly, or has a virtual COM port driver (see Chap. 6.10 - Virtual Com Port -) to unpack it.

5.2.1.1 Outgoing TCP connections

The INSYS GPRS 5.0 serial will address the remote terminal either directly via the IP address (e.g. 212.77.161.1) or via the domain name (e.g. www.insys-tec.de).

5.2.1.2 Incoming TCP connections

The INSYS GPRS 5.0 serial is addressed via its IP address. Its IP address must be routable. The IP address may be static or dynamic. For dynamic IP addresses, the INSYS GPRS 5.0 serial supports the function to communicate the IP address it received during the dial-up into the GPRS network to a remote terminal (see Chapter VCOM).

The GPRS modem emulation - TCP transparent - can be set with the help of the HSComm. Click the according tab.

5.2.2 Defaults

For the operation within the GPRS network an APN (Access Point Name) must be selected.

In HSComm, we prepared numerous European APNs for selection.

INSYS GPRS 5.0 serial Connection

According to the APN, PPP authentication is required. The necessary information can be obtained from the customer service center of your provider.

When using VPN or "FIX IP" solutions, authentification must in general always be used.

On the basis of the entered APNs you can determine if a user name or a password is required.

 user:<username> or pw:<password>

PAP authentification, user name or password is required as stated.

 user: or pw:

No authentication, user name or password is required.

 user:[any] or pw:[any]

PAP authentification, any user name or any password is required.

Alternatively, the settings can be entered or modified using the terminal program.

Enter the Access Point Name (APN) GPRS dial-in for the integrated TCP/IP stack

AT**GPRSAPN=<apn> AT**DIALIN=1

GPRS dial-in number for the integrated

AT**DIALINNR=*99***1#

TCP/IP stack

Enter the user name

AT**PPPUSER=<user>

Connection INSYS GPRS 5.0 serial

Enter the password Enter the authentification type (usually

AT**PPPPW=<pw> AT**PPPAUTH=<auth>

PAP) for the integrated TCP/IP stack

Save settings

AT**SAVE

Perform RESET, accept all parameters

AT**RESET

INSYS GPRS 5.0 serial Connection

5.2.3 Settings for the leased line

The INSYS GPRS 5.0 serial will automatically establish a leased line after the device is switched on, or after a reset. The connection is monitored and re-established after interruptions.

For the implementation the selection of the remote terminal – CSD, IP or URL – is required as a first step. In our example, we selected an IP address as remote terminal.

In a second step, the IP address of the remote terminal must be stated together with the according port. In our example, this is the IP 192.168.100.1 with port 80.

Connection INSYS GPRS 5.0 serial

Alternatively, the settings for the leased line operation can be entered or modified using the terminal program.

Connection to an IP address

Setting for leased line function Remote terminal IP address Remote terminal TCP port Save settings Perform RESET,

AT**LL=2 AT**AUTOIP=<ip> AT**AUTOPORTIP=<port> AT**SAVE AT**RESET

accept all parameters

Connection to a domain name

Setting for leased line function Remote terminal IP address Remote terminal TCP port Save settings Perform RESET,

AT**LL=3 AT**AUTOURL=<url> AT**AUTOPORTURL=<port> AT**SAVE AT**RESET

accept all parameters

Alternative Access for leased line:

For applications which require high availability even if a remote terminal server fails, a alternative access may be set.

It is based on the following mechanism: If the INSYS GPRS 5.0 serial is restarted in leased line operation, the pre-defined

AutoDial default destination is dialed after 20 seconds. If the connection setup fails, the device will attempt to dial the AutoDial alternative destination. If the connection setup to the AutoDial alternative destination fails as well or if no AutoDial alternative destination was entered, the dialing attempt will be repeated after a waiting period has expired. First the default destination will be attempted to read, and in case of a failure, the alternative destination. After each failed dialing attempt (this includes both destinations), the waiting period is increased (in steps of 40, 80, 320, 180 and 3600 seconds). The maximum waiting period is 3600 seconds. After the waiting period has expired, the device will again attempt to establish a connection to one of the two destinations. The command AT**LLWAITRST defines the maximum number of failures. If this maximum number of failed connection attempts is reached, the device will be restarted. Only the failed connection attempts to the main destination are rated. The destination, with which a successful connection is established, will be used as new AutoDial standard destination until the device is restarted.

INSYS GPRS 5.0 serial Connection

The alternative destination is specified with the following settings:

Connection to an IP address as alternative access

Setting for leased line function Remote terminal IP address Remote terminal TCP port Save settings Perform RESET,

accept all parameters

Connection to a domain name as alternative access

Setting for leased line function Remote terminal domain name Remote terminal TCP port Save settings Perform RESET,

accept all parameters

AT**LL2=2 AT**AUTOIP2=<ip> AT**AUTOPORTIP2=<port> AT**RESET AT**SAVE

AT**LL2=3 AT**AUTOURL2=<url> AT**AUTOPORTIP2=<port> AT**SAVE AT**RESET

The successfully established connection is indicated by the control signal DCD and the message CONNECT.

5.2.4 Settings for TCP Listen (incoming TCP connections)

The function TCP Listen allows the acceptance of incoming TCP connections. The device will dial into the GPRS network und wait for incoming TCP connections.

Enter the following settings for the operating mode TCP Listen:

Connection INSYS GPRS 5.0 serial

Alternatively, the settings for TCP Listen can be entered using the terminal program.

Automatic Connection acceptance Save this setting

ATS0=2 AT&W

Set the TCP data port Activate TCP Listen Save settings Perform RESET,

AT**TCPLISTENPORT=1234

AT**TCPLISTEN=1 AT**SAVE AT**RESET

accept all parameters

The successful dial-up into the GPRS network is displayed after the startup with the message +PPP-IP SETUP; the INSYS INSYS GPRS 5.0 serial can now be reached via its IP address.

If the connection can not be established (network failure, etc.) or if the connection is terminated, the INSYS GPRS 5.0 serial will automatically start reconnecting.

To limit the connection costs for failed connection setups (for each connection setup data packets are created and billed), the delay time will increase for every new repeated attempt.

 20 seconds after restart or if the last connection setup was successful

 80 seconds after the first failure

 320 seconds after the second failure

 1280 seconds after the third failure

 1 hour for each additional failure

INSYS GPRS 5.0 serial Connection

For TCP Listen mode, the number of dialing attempts until a device is restarted can be limited with the command AT**TCPLISTENWAITRST=<n>. For example, the INSYS GPRS 5.0 serial is restarted with AT**TCPLISTENWAITRST=3 after the third dialing attempt (20s+80s+320s). This will restart the dialing cycle. The default value for this setting is 255.

5.2.5 Manual connection setup

Establish a connection to an IP address or a host with domain name.

IP address <ip> with port <port> Domain Name <domain> with the port

<port> Response: Connect

The call was accepted; the transfer of data can begin.

5.2.6 Automatic connection setup (leased line)

With the leased line function, a preset destination is automatically dialed.

The connection setup and the connection itself are monitored.

If the connection can not be established (network failure, remote system does not respond) or if the connection is terminated, the INSYS GPRS 5.0 serial will automatically start reconnecting.

To limit the connection costs for inaccessible remote terminals (for each connection setup data packets are created and billed), the delay time will increase for every new repeated attempt.

ATD<ip>:<port> ATD<domain>:<port>

 20 seconds after restart or if the last connection setup was successful

 80 seconds after the first failure

 320 seconds after the second failure

 1280 seconds after the third failure

 1 hour for each additional failure

Connection INSYS GPRS 5.0 serial

The number of dialing attempts for the leased line mode can be limited with

AT**LLWAITRST=<n>. For example, the INSYS GPRS 5.0 serial is restarted with AT**LLWAITRST=3 after the third dialing attempt (20s+80s+320s). This will re-

start the dialing cycle. The default value for this setting is 255.

Note

This setting increases the availability of the INSYS GPRS 5.0 serial and its application. However, due to the increased number of dialing attempts that are performed shortly one after the other, higher connection costs may occur. This depends on the terms of the contract with the mobile network provider.

5.2.7 Connection acceptance

Use the function TCP listen to accept incoming TCP connections.

Alternatively, the settings can be entered or modified using the terminal program.

Incoming connections are indicated in the

RING

terminal program. The connection acceptance takes place ei-

ATS0=<n> ther automatically or after a set number <n> of ring signals

or manually.:

ATA

The connection was accepted.

CONNECT

As soon as the INSYS GPRS 5.0 serial has displayed the message PPP-IP SETUP, it can be reached by incoming TCP connections, i.e. it is in Listen mode at the TCP port which has been set with the command AT**TCPLISTENPORT.

Outgoing TCP connections can still be established.

Please note: Not all AT commands can be used in the operating mode "TCP Listen". Please find an overview in the Chapter "7. AT commands".

The INSYS GPRS 5.0 serial is able to independently and periodically check its status in the GPRS network and thus its availability. Use the command AT**PPPIPCHECK.

INSYS GPRS 5.0 serial Connection

If the test is successfully performed, the message "+PPP-IP OK" is displayed.

If the test fails, the GPRS connection is terminated (message +PPP-IP RELEASE) and the TCP Listen mode is reestablished.

To save costs if there is a problem with availability, the waiting time between the repeat attempts will grow for each subsequent attempt.

 20 seconds after restart or if the last connection setup was successful

 80 seconds after the first failure

 320 seconds after the second failure

 1280 seconds after the third failure

 1 hour for each additional failure

The number of dialing attempts for the TCP Listen operation can be limited with AT**TCPLISTENWAITRST=<n>. For example, the INSYS GPRS 5.0 serial is restarted with AT**TCPLISTENWAITRST=3 after the third dialing attempt (20s+80s+320s). This will restart the dialing cycle. The default value for this setting is 255.

Note

This setting increases the availability of the INSYS GPRS 5.0 serial and its application. However, the increased number of dialing attempts that are performed shortly one after the other, higher connection costs may occur. This depends on the terms of the contract with the mobile network provider.

The INSYS GPRS 5.0 serial offers systems with dynamic IP addresses the option to communicate the IP addresses allocated by the provider during the current GPRS dial-up into TCP Listen ((+PPP-IP SETUP) to a server. More in Chapter "6.10 Virtual COM Port".

Connection INSYS GPRS 5.0 serial

5.2.8 During the connection

5.2.8.1 Keep Alive

The data transfer via GPRS is packet-oriented. If no side of the TCP connection sends data, there will be no traffic via the transmission link. This also means that it can not be determined if the remote terminal has disappeared without properly terminating the connection (e.g. due to a failure of the radio network or a failure of the remote terminal).

It can also occur that GPRS network providers terminate connections themselves to be able to offer the resources to other participants, if there is no data transfer for an extended period of time.

For these cases, TCP offers a suitable accessory by sending Keep Alive messages. The period between two monitoring packets can be set to 1 minute steps (or be turned off completely).

If three successive monitoring packets are not responded to, the connection is regarded as terminated, and the INSYS GPRS 5.0 serial returns to offline mode. If the device is configured as a leased line device, the connection will then be reestablished. Keep Alive will mostly be used for leased lines, because the application on location is usually not able to assume the connection control and monitoring.

Alternatively, the settings can be entered or modified using the terminal program.

TCP Keep Alive Timer is set to 10 minutes Save changes Changes take effect with a restart of the de-

vice

Note

Keep Alive creates traffic, as each Keep Alive packet is in principle an empty TCP/IP message which must be confirmed by the remote terminal. For a Keep Alive, two empty TCP/IP messages with 40 byte each are sent.

When selection the TCP aggregation timeouts, the rate and the billing type in your GPRS agreement must be considered as well.

See also: see Chapter 5.2.2 - Defaults

Alternatively, the access control can be set using the terminal program:

Default:

For the operation within the GPRS network, an Access Point and the GPRS access data must be selected.

Activate selective call acceptance

Enter allowed phone number 1

Enter allowed phone number 2

Enter allowed phone number 3

AT**CLIP=1

AT**CLIP1=<nr1>

AT**CLIP2=<nr2>

AT**CLIP3=<nr3>

Functions INSYS GPRS 5.0 serial

Store possible connection destinations:

 IP address and port

 Domain name and port

 GSM data connection (CSD)

Store the callback connection type (IP, domain name, CSD) for the three phone numbers

AT**AUTOIP=<ip> AT**AUTOPORTIP=<port>

AT**AUTOURL=<domain> AT**AUTOPORTURL=<port>

AT**AUTOCSD=<phone number>

AT**CALLBACK=

Save settings

AT**SAVE

Perform RESET, accept all parameters

AT**RESET

For IP and domain name destinations it is also possible to enter a substitute access, it is therefore possible to enter different destinations of the same kind for the different numbers. Example: for CLIP1 a callback to the IP address 1.2.3.4, and for CLIP2 a callback to the IP address 5.6.7.8.

INSYS GPRS 5.0 serial Functions

Example:

A “TCP transparent” connection from the INSYS GPRS

5.0 serial to the service center must be established, controlled by a call (Callback).

In addition, the existing possibility to directly call from the service center for emergencies (GPRS failure, performance problems) should be maintained. Only the number of the modem connection for the service center should be made available for this call.

For a call from the Clip number 2 (mobile phone), a “TCP transparent” connection to the service center must be established.

The service center has a normal modem connection with the number 04989949494. A service mobile phone with the number 01711253456 exists. Furthermore, the service center has a fixed internet connection with the IP address: 200.12.0.120; the TCP port 10000 was enabled for connections to the INSYS GPRS 5.0 serial.

On the tab "Access control/Autodial":

The selective call acceptance/callback must be set in our example as follows:

Functions INSYS GPRS 5.0 serial

In a second step, the IP target for the callback must be entered.

Afterwards, on the tab "Basic settings"

the automatic call acceptance after 2 ring tones is required.

Alternatively, our example can be set using the terminal program:

In general, activate selective call acceptance

AT**CLIP=1

Enter allowed phone number 1

Enter allowed phone number 2

Store destination IP for callback

Store destination TCP port for callback

AT**CLIP1=

+494989949494.

AT**CLIP2= +491711253456

AT**AUTOIP=

200.12.0.120

AT**AUTOPORTIP=

10000

Store callback settings

AT**CALLBACK=

0,2,0

 No callback action for call from phone num-

ber 1

 IP callback for call from phone number 2

 No callback action for call from phone num-

ber 3

INSYS GPRS 5.0 serial Functions

Save the extended functions

Automatic acceptance of an incoming CSD call

(for the call of a service center modem)

Save setting for ATS0

Perform RESET, accept all parameters

AT**SAVE

ATS0=2

AT&W

AT**RESET

Note

A connection can be established independent from the callback settings via SMS command (provided that the sender number is stored at AT**CLIP<index>=<n>).

6.3 Defined termination of GPRS connections for incoming CSD calls ("CSDPRIO")

For different applications, it is necessary to access them with CSD data connections, although the normal operation runs with TCP connections.

The reasons may be as follows:

• To perform time-critical applications (e.g. software updates from controllers).

• To enable service technicians to access the application or the INSYS GPRS 5.0 se-

rial, which are not integrated in the communication system based on TCP connections.

• To still have remote access to the application in case the GPRS network fails.

• To still have remote access to the application in case the TCP infrastructure of the

control center fails.

• The basic requirement for the utilization of CSDPRIO is the support of the selective call acceptance (AT**CLIP=1). Two modes are available: In the first mode (AT**CSDPRIO=1), only authorized calls may trigger this function and terminate the connection. In the second mode (AT**CSDPRIO=2), any caller may terminate the connection.

• If during the CSD call the following applies:

o A TCP connection is established: It will be terminated (NO CARRIER); some

topics must be observed due to the nature of this:

 In some cases (depending on the provider), the TCP RST which the

INSYS GPRS 5.0 serial creates in this case to terminate, the connec-

Functions INSYS GPRS 5.0 serial

tion will be sent to the remote terminal only after the CSD connection is ended.

 If data is transmitted via GPRS during the CSD call (e.g. via a TCP

connection), it may occur that the caller receives the BUSY signal. In this case, the dial-in should be repeated. The rule of thumb would be that the CSD call will be forwarded after a minimum of approximately 30 seconds after the last data byte was transmitted via GPRS.

o A GPRS dial-in (TCP Listen mode, waiting for incoming TCP connection): In

this case, the TCP Listen mode is terminated for the duration of the CSD call (+PPP-IP RELEASE), and restarted afterwards (+PPP-IP SETUP).

Due to the additional time which is required to terminate the TCP or the GPRS connection, the caller must be prepared for a slightly longer waiting period until the connection is accepted. Example: If the INSYS GPRS 5.0 serial is set using ATS0=2 for accepting CSD connections after two ring tones, in general actually 5 to 6 ring tones (RINGs) are required. Please set the number of rings to a minimum of three rings to ensure full functionality, if you want to use automatic call answering.

6.3.1 CSD priority with caller authentification

Alternatively, our example can be set using the terminal program:

In general, activate selective call acceptance

AT**CLIP=1

Enter allowed phone number 1

AT**CLIP1=+49941586920

Activate CSDPRIO

AT**CSDPRIO=1

INSYS GPRS 5.0 serial Functions

Save settings

AT**SAVE

Perform RESET, accept all parameters

AT**RESET

6.3.2 CSD priority without caller authentification

This function makes it possible that each caller can terminate the existing data connection. In this case, the phone numbers must not be entered. Phone numbers that were entered anyhow, will not be rated.

Alternatively, the function can be set using the terminal program:

In general, activate selective call acceptance (To activate the call signals or enable them to

be processed by the INSYS GPRS 5.0 serial, this setting must be entered.)

Activate CSDPRIO without phone number authentification

Save settings

Perform RESET, accept all parameters

AT**CLIP=1

AT**CSDPRIO=2

AT**SAVE

AT**RESET

Note

Regardless of the authentification settings, a callback number can be stored.

6.4 Automatic Logout and Login or Restart of the Device

Scheduled logout/login or a device restart can be activated using the HSComm. Click on the tab “Basic Settings”.

Functions INSYS GPRS 5.0 serial

6.4.1 Automatic login at restart

The INSYS GPRS 5.0 serial can store the SIM card PIN internally, which enables it to log into the GSM network after each restart and reset, without user intervention.

All four globally used frequency ranges 850 MHz, 900 MHz, 1800 MHz and 1900 MHz are supported. At the respective location, the INSYS GPRS 5.0 serial will automatically operate with the frequency range provided by the network provider.

Before using the INSYS GPRS 5.0 serial, you should

check the certification requirements in the country of deployment.

Note: As default, the INSYS GPRS 5.0 serial will login to

the strongest available GSM network. If required, a preferred network can be pre-selected with the command AT**PROVIDER, if necessary.

6.4.2 Periodic Logout and Login or Restart of the Device

AT**PIN=<pin>

AT**PROVIDER= <mode>[,<form at>[,<oper>]]

For function support even after infrastructure changes and network software updates by the network providers, the INSYS GPRS

5.0 serial can be logged out of the GSM network via a timer. The timer can be set by the hour up to a maximum of 99 hours and starts when the device is switched on. A few minutes after the module logged out it will automatically log back in. The timer restarts.

If a TCP transparent or a data connection (CSD or GPRS) is established at the time of the logout, the logout will wait until the connection is terminated.

As an option, there is also the possibility to perform a complete restart of the device after the timer has expired. The INSYS GPRS

5.0 serial will start automatically with the stored settings.

6.4.2.1 Conditional restart:

If a TCP transparent or a data connection (CSD or GPRS) is established at the time of the logout, the restart will wait until the connection is terminated.

6.4.2.2 Unconditional restart:

The device is restarted in any case.

INSYS GPRS 5.0 serial Functions

Examples:

In our example 1, the INSYS GPRS 5.0 serial will be logged out and back in every 3 hours.

Alternatively, the scheduled logout/login can be set, changed or deleted using the terminal program.

AT**LOGOUT=<n>[,<mode>]

Our example – 3 hrs.

AT**LOGOUT=3

In our example 2, the INSYS GPRS 5.0 serial performs a restart every 3 hours.

Alternatively, the scheduled logout/login can be set, changed or deleted using the terminal program.

AT**LOGOUT=<n>[,<mode>]

Our example – 3 hrs.

AT**LOGOUT=3,2

Functions INSYS GPRS 5.0 serial

6.5 Automatic SMS Processing

Note: The sending time of an SMS from the sender to a re-

cipient depends on the pertinent provider of the service number. Due to the network load and the time of day, the time required for sending an SMS may change.

The automatic processing of SMS messages can be set using the HSComm. Click on the tab “Basic Settings”.

6.5.1 Activation

Activation in HSComm is done by clicking the automatic SMS processing.

Each incoming SMS is deleted after it has been processed. Each SMS with an INSYS AT command is processed. Any other SMS is immediately deleted.

If other SMS messages are required for processing with the application, the field “Leave remote SMS in SIM buffer” must also be clicked.

The “remote SMS messages” must be read out regularly.

INSYS GPRS 5.0 serial Functions

Alternatively, automatic SMS processing can be set, changed or deleted using the terminal program.

Each incoming SMS is deleted after it has been processed.

AT**SMSRX=1

Only incoming SMS messages with a command to the INSYS GPRS 5.0 serial are deleted, remote SMS are left in the buffer.

AT**SMSRX=2

6.5.2 Reading interval

The reading interval can be set from 20 to 60 seconds.

Alternatively, the GSM reading interval can be changed using the terminal program.

AT**GSMREQ=<n>

6.5.3 Syntax

SMS intended for the INSYS GPRS 5.0 serial must have the following syntax:

[<password>,]<command>[,CN: [<callbacknumber>]]

Detailed explanation:

Configuration via SMS, without reply

Note: See also Chapters

and

Configuration via SMS,with acknowledgement:

Note: Between CN: <phonenumber> a space must be

Note

Due to different GSM/GPRS network structures it may occur that the provider cannot deliver any SMS to the GSM/GPRS engine while data packets are sent/received via GPRS (this relates to standard GPRS calls and “TCP transparent” calls via GPRS).

Experience shows that an SMS is only sent during data transmission breaks longer than 30 seconds.

Kap.

6.1.1

- Password protection

Kap.

6.1.2

- Selective call answer

<command>, CN:

[<phonenumber>]

entered. If no phone number is entered after CN:

Functions INSYS GPRS 5.0 serial

is protected

rotected

the response returns automatically to the sender.

Configuration via SMS, if the INSYS GPRS 5.0 serial by a password.

Configuration via SMS, if the INSYS GPRS 5.0 serial is p by a password and a confirmation is desired.

Note: Between CN: <phonenumber> a space must be

entered. If no phone number is entered after CN: the response returns automatically to the sender.

6.5.4 Access Protection

To protect against unauthorized configuration or attempts to establish a connection, two protection mechanisms are available which are also used for incoming SMS.

 Configuration password

Note: See also Chapter

 Selective call answer

Note: See also Chapter

Depending on the settings, SMS from unauthorized senders or with an invalid password are either

 Deleted immediately, or  Stored in the memory and not processed

6.1.1

- Password protection

6.1.2

- Selective call answer

<password>,

<command>, CN: [<phonenum-

ber>]

AT**PASSC=<pw>

AT**CLIP=1

AT**SMSRX=1

AT**SMSRX=2

6.5.5 SMS storage locations

necessary.

The automatic processing of an incoming SMS takes place via an independent, module-internal interface and has usually no effect on the communication between the application and the GSM/GPRS engine.

Only when the SMS memory is accessed (especially reading and deleting), it can happen that the µcontroller accesses the SMS storage location at the same time. In this case, the application would receive ERROR as response. The application should therefore execute the command once more, if

INSYS GPRS 5.0 serial Functions

The INSYS GPRS 5.0 serial evaluates all SMS storage locations made available by the GSM/GPRS engine (storage locations of the SIM card and storage locations in the engine itself).

The SMS settings for the module-internal interface used for processing are independent from the interface settings for the application (text mode, used storage locations).

6.6 Manually Dispatching SMS

Note

The sending time of an SMS from the sender to a recipient depends on the pertinent provider of the service number. Depending on the network load and the time of day, an SMS may be on the way for an extended period.

Due to the limited availability of AT commands in the operating mode "TCP Listen", no manual sending of SMS is possible when the TCP Listen mode is active.

Set SMS text mode

The SMS service center number of the network provider may be omitted if the number is stored on the SIM card.

Enter the destination phone number

Wait for the prompt “>”, enter the text

The SMS is dispatched using the key combination Ctrl and Z.

Prior to the confirmation message you will be informed about the amount of SMS that have already been sent.

Note:

The service center phone number must be written in international format, e.g. for a German provider starting with “+49”.

AT+CMGF=1

AT+CSCA=<nr>

AT+CMGS=<nr>

><text><Ctrl+Z >

CMGS: <Num> ok

Functions INSYS GPRS 5.0 serial

6.7 Digital Inputs and Potential-Free Outputs

The INSYS GPRS 5.0 serial has digital inputs and outputs. The outputs can be switched via AT commands to control external functions. The inputs can be used to trigger an action of the INSYS GPRS 5.0 serial. The inputs can be used to dial a connection to an AutoDial destination or to send an SMS. The action is triggered through a change of the input from HIGH (inactive) to LOW/GND (active). The level change is accepted after 0.3 seconds, i.e. the input is debounced. In addition, there is the possibility for IO tunneling, i.e. transmit the input states via a TCP connection to another INSYS GPRS 5.0 serial or a server.

6.7.1 Automatic SMS dispatch via the switch input

Note

To enable the automatic sending of SMS messages, the device must know the number of a SMS service center. Make sure that the service center number is entered and stored in the device via AT commands.

The INSYS GPRS 5.0 serial can send a predefined SMS via a level change of the digital inputs UI. The SMS is triggered through the connection of the input with ground (GND). The alarm input is on HIGH potential by a pull-up resistor in open state (inactive).

The SMS is triggered through a change of the input from HIGH (inactive) to LOW/GND (active). The level change is accepted after 0.3 seconds (debounce).

To resend the SMS, the input must be set to HIGH (inactive). If the input state at both inputs changes at the same time, the input state 1 will be evaluated first. If the state changes at the other input while a state change at one input is being processed, the event is stored and processed later.

INSYS GPRS 5.0 serial Functions

Functions INSYS GPRS 5.0 serial

Alternatively, our example can be set using the terminal program:

In this example, you must note the order of the AT commands!

AT**INPUT1=1

Automatic activation of SMS dispatch

AT**INPUT1=2

AT**INPUT1=1 for input 1; if you want to use only 1

switch input, use input 1.

AT+CPMS=MT,MT,MT

AT**INPUT2=1 for input 2.

Set SMS storage locations

Activate SMS text mode

AT+CMGF=1

Delete SMS storage location 1 preliminary,

AT+CMGD=2 for storage location 2. You must delete

AT+CMGD=1 AT+CMGD=2

this storage location, if you want to trigger an SMS via the second input.

The SMS service center number of the network provider

AT+CSCA=<SCNR>

(may be omitted if the number is stored on the SIM card).

Enter the destination phone number

Wait for the prompt “>”, enter the text

AT+CMGW=<nr>

> <text message 1>

The SMS is saved using the key stroke combination Ctrl+Z.

<Ctrl+Z>

If you trigger an SMS via input 2, you continue entering the text for the SMS 2.

AT+CMGW=<nr>

> <text message 2>

<Ctrl+Z>

With AT+CMGL=ALL, you can check if the messages were stored correctly and in the correct order.

INSYS GPRS 5.0 serial Functions

Save settings for advanced functions Save settings for SMS commands Perform RESET, accept all parameters

AT**SAVE AT&W AT**RESET

6.7.2 Connection setup via switch input

By changing the input states, connections can be established to the predefined AutoDial destinations automatically. The inputs are debounced.

At the time of events at the switching inputs, existing connections are terminated. In TCP Listen mode, the TCP Listener is closed as well. The connection is reestablished after all the events have been processed, if Leased Line or TCP Listen mode is active.

Functions INSYS GPRS 5.0 serial

Alternatively, the function can be configured using the terminal program:

Automatic activation of the connection setup for AutoDial destination <n> via input 1.

The command to set the input behavior is

AT**INPUT2=<n> for input 1.

AT**INPUT2=<n> for input 2.

Use the parameter <n> to set the destination, which will be dialed for an event at the input. Values for <n>:

2: IP connection to AT**AUTOIP/AUTOPORTIP 3: IP connection to AT**AUTOURL/AUTOPORTIP 5: IP connection to AT**AUTOIP2/AUTOPORTIP2 6: IP connection to AT**AUTOURL2/AUTOPORTURL2

Example: Connection to predefined IP via event at input 2:

AT**INPUT1=<n>

AT**INPUT2=2

6.7.3 Transmitting the input states to another INSYS GPRS 5.0 serial (IO tunneling)

The INSYS GPRS 5.0 serial can transmit its input states to another, remote INSYS GPRS 5.0 serial or to a server via a TCP/IP connection. The second INSYS GPRS 5.0 serial can output the transmitted states at the outputs. The second device can output the states of its inputs at the outputs of the first device as well. The "Leased Line" function must be active at the INSYS GPRS 5.0 serial so it can establish a permanent connection to the other INSYS GPRS 5.0 serial. The second device uses the TCP Listen function to accept the connection of the first device. The states are transmitted periodically, i.e. after a set time or immediately during the change of a state.

The transmission of the states consists of the following sequence: 0x1B<out1><out2> 0x1B = ESC character <out1>= Value for state 0: 0x30. Value for state 1: 0x31. Example =0x1B 0x30 0x31 sets output 1 to 0 and output 2 to 1.

The transmission can take place "in-band", i.e. during a running data transmission. For this purpose, the Escape character is doubled from the sending INSYS GPRS 5.0 serial. This means that two Escape characters are sent. This prevents the misinterpretation of the Escape characters in the data stream.

Configuration of the first device:

INSYS GPRS 5.0 serial Functions

Functions INSYS GPRS 5.0 serial

Configuration of the second device:

INSYS GPRS 5.0 serial Functions

Alternatively, this function can be set using the terminal program:

Configuration of the first device:

Enter the output device as AutoDial address:

AT**LL=2

Activate the leased line operation to the IP address of the other device

AT**AUTOIP=100.1

20.32.5

Define the transmission port:

AT**AUTOIOPPORT= 1234

Activate the change transmission for input 1:

AT**INPUT1=8

Activate the change transmission for input 2:

AT**INPUT2=8

Set the transmission behavior:

-for the transmission when the level is changed:

AT**INPUTCHANGE=

-for the transmission after a certain time (in minutes):

Values for <n>: 1-255 (minutes) The option AT**INPUTTIMEOUT Option can be used si-

multaneously with AT**INPUTCHANGE. AT**INPUTTIMEOUT prevents the provider from terminating the unused, open connection.

Save the settings. Reset the device.

AT**INPUTTIMEOUT =<n>

AT**SAVE

AT**RESET

Configuration of the second device:

Activate TCP Listen:

AT**TCPLISTEN=1

Set the port to accept the connection

AT**TCPLISTENPOR T=1234

Activate the automatic connection acceptance after 2 "rings",

ATS0=2

Activate the change transmission for input 1:

AT**INPUT1=8

Activate the change transmission for input 2:

AT**INPUT2=8

Set the transmission behavior:

-for the transmission when the level is changed:

AT**INPUTCHANGE= 1

Functions INSYS GPRS 5.0 serial

-for the transmission after a certain time (in minutes):

AT**INPUTTIMEOUT

Values for <n>: 1-255 (minutes)

The option AT**INPUTTIMEOUT Option can be used simultaneously with AT**INPUTCHANGE. AT**INPUTTIMEOUT prevents the provider from terminating the unused, open connection.

Save the settings. Save the standard settings.

=<n>

AT**SAVE

AT&W

AT**RESET

Reset the device.

6.8 Remote configuration

INSYS GPRS 5.0 serial Functions

AT**FLASH

During a CSD or “TCP transparent” data connection, the INSYS GPRS 5.0 serial can be switched to remote command mode by entering the escape sequence via the data connection from the remote terminal.

<pause>

****

<pause>

Note: After the 4 escape characters were entered at the local de-

vice (1 second pause before and after the entry, no return - <CR> -), the remote configuration at the remote terminal is activated. The data connection is maintained in the background. The 4 escape characters must be entered within 1 second.

If this was configured, the configuration password is queried before the switching to the remote command mode occurs.

Note: See also Chapter

6.1.1

- Password protection

CONFIG

After the escape sequence is detected, the prompt for entering the password appears.

PASSWORD:

If no valid password is entered within 30 seconds (attention: complete the entry with line end character), the configuration mode will be exited with the following message

A valid password is acknowledged with OK; now the AT commands released for remote configuration can be entered.

Terminate configuration

Note: Due to the sometimes long packet run times for TCP

connections, the escape character **** must be sent in one TCP packet. Otherwise the pauses between the individual characters get too large and the reception of the sequence is terminated.

6.9 Firmware Update

The firmware of the µcontroller can be loaded locally (via the serial interface), and remote (CSD or "TCP transparent" connection).

ERROR

AT**EXIT

Before the firmware is updated, hardware handshake must

always be activated ((INSYS GPRS 5.0 serial and remote terminal).

The process is started. The device prepares itself for receiving the new firmware.

After the response, the firmware (file with the ending *.hex) is sent as a text file.

Send *.HEX file now

Functions INSYS GPRS 5.0 serial

After the file has been received, the device needs up to 60 seconds to complete the upload. Afterwards, the (INSYS GPRS 5.0 serial will automatically perform a restart.)

Note

After an update, the settings for the advanced functions are reset to the factory defaults.

The SIM card PIN (AT**PIN) and the standard command settings of the GSM/GPRS engine are maintained, which means that if automatic call acceptance (e.g. ATS0=2) is activated, the device can still be accessed from outside to enable the re-configuration of the extended functions per CSD call via remote configuration.

6.10 Virtual COM Port

Applications, which up to now communicated with the end devices via a modem connection or directly via a serial interface, will not function directly with TCP connections.

A virtual COM port is required, which will process TCP connections on one side and make a COM port to the operating system available on the other side.

INSYS MICROELECTRONICS GmbH offers a free virtual COM port for the operating systems Windows XP/2000.

The virtual COM port provides the following functions:

6.10.1.1 Authentication for outgoing TCP connection:

Notification about a unique device ID via a UDP packet prior to the actual TCP connection, or directly at the beginning of a TCP connection.

6.10.1.2 Information about the new IP address:

INSYS GPRS 5.0 serial Functions

This setting will only apply to the operating mode TCP Listen. It is used to communicate the just allocated IP address together with a unique device ID to the server (IP address or domain name), when IP addresses are dynamically allocated.

6.10.1.3 Authentication for incoming TCP connection:

This setting will only apply to the operating mode TCP Listen. A TCP connection is only accepted if the "caller" has sent a valid authentication via a UDP packet in advance. This function is also used to terminate a "hanging" TCP connection for the INSYS GPRS 5.0 serial (e.g. due to a network failure or a crash of the remote terminal). When a valid UDP packet is received, the existing TCP connection is terminated to be able to accept the new connection.

Please request more information about the virtual COM port VCOM from insys@insys-tec.de.

Short Description INSYS AT Commands INSYS GPRS 5.0 serial

7 Short Description INSYS AT Commands

7.1 Overview

Command

ATD

ATH

ATA

AT**AUTOCSD

AT**AUTOIP

AT**AUTOPORTIP

AT**AUTOURL

AT**AUTOPORTURL

AT**BAUD

AT**CALLBACK

AT**CLIP

AT**CSDPRIO

AT**DEFAULT

AT**DIALIN

AT**DIALINNR

AT**EXIT

AT**FLASH

AT**FORMAT

AT**GPRSAPN

AT**GSMNET

AT**GSMREQ

AT**IMEI

Implementation possible

Offline local for

Short description

Establish CSD or “TCP transparent” connections

Terminate CSD or “TCP transparent” connections

Accept CSD or “TCP transparent” connections

AutoDial CSD destination number

AutoDial destination: IP address

AutoDial destination port for destination IP

AutoDial destination: domain name

AutoDial destination port for domain name

Baud rate of the serial interface

AutoDial function callback

Selective call answer

Termination of GPRS connections for incoming CSD calls

Factory settings of the INSYS AT commands

Dial-in type for integrated TCP/IP stack

Dial-in number for integrated TCP/IP stack

Exit remote command mode

Firmware update of the µcontroller

Data format of the serial interface

GPRS-APN for integrated TCP/IP stack

Display of GSM network parameters

Query interval for automatic SMS processing and reading the network parameters

Display of device IMEI

Offline

local

active PPP con-

nection (TCP

Listen)

Online

local

Remote SMS

INSYS GPRS 5.0 serial Short Description INSYS AT Commands

Command

AT**IMSI

AT**IN

AT**INPUT

AT**INPUTCHANGE

AT**INPUTTIMEOUT

AT**KEEP

AT**LASTCON

AT**LL

AT**LLWAITRST

AT**LOGOUT

AT**OUT

AT**PASSC

AT**PIN

AT**PPPAUTH

AT**PPPPW

AT**PPPUSER

AT**PPPIPCHECK

AT**PROFILE

AT**PROVIDER

AT**RESET

AT**SAVE

AT**SCN

AT**SIGNAL

AT**SMSRX

AT**TCPAGG

AT**TCPBLOCK

AT**TCPLISTEN

Implementation possible

Offline local for

Short description

Display of SIM-IMSI

Query of the switch inputs

Determine event handling for inputs

Transmitting the input state for changes at the input level

Periodic transmission of the input states

TCP Keep Alive

Display of information about the last connection

AutoDial function leased line

Number of failed dialup attempts until reset in Leased Line mode

Timer-controlled logout/login

Set/reset the switch outputs

Configuration password X

SIM card PIN

PPP authentification type for integrated TCP/IP stack

PPP password for integrated TCP/IP stack

PPP user name for integrated TCP/IP stack

PPP connection check for operating mode TCP Listen

Display settings

GSM network provider selection

Restart

Save the extended INSYS settings

SMS service center number

GSM signal field strength

Automatic SMS reception processing

TCP block formation timer of the integrated TCP/IP stack:

TCP block size of the integrated TCP/IP stack

Operating mode TCP Listen

Offline

local

active PPP con-

nection (TCP

Listen)

Online

local

Remote SMS

Short Description INSYS AT Commands INSYS GPRS 5.0 serial

Command

AT**TCPLISTENPORT

AT**TCPLISTENWAITRST

AT**VCOM

AT**VCOMPORT

AT**VCOMIP

AT**VCOMURL

AT**VCOMTIMEOUT

AT**VERSION

Short description

TCP data port for incoming TCP connections in the operating mode TCP Listen

Number of failed dialup attempts until reset in TCP Listen mode

Support of the INSYS virtual COM port driver

UDP destination port for the information about the IP address for TCP Listen

UDP destination IP address for the information about the IP address for TCP Listen

UDP destination URL for the information about the IP address for TCP Listen

Timeout for TCP variant for authentification at the virtual COM port

Display of the software version

Offline

local

Implementation possible

Offline local for

active PPP con-

nection (TCP

Listen)

Online

local

Remote SMS

X = implemented/enabled

INSYS GPRS 5.0 serial Short Description INSYS AT Commands

7.2 Availability/Storage

The following INSYS AT commands are saved immediately after they are entered without AT**SAVE, but only activated after a restart.

 AT**PROVIDER  AT**PIN  AT**GPRSAPN  AT**PPPAUTH

The following settings are immediately saved when entered, and active:

 AT**BAUD  AT**FORMAT

The other settings are immediately accepted and first stored permanently with AT**SAVE.

GPRS General INSYS GPRS 5.0 serial

8 GPRS General

8.1 Application Notes

8.1.1 GSM

The provider enables the requested services. A SIM card can be enabled for voice and data services at the same time. The following table lists the usually available cards and contracts.

Function Prepaid card Contract for voice

transmission

Outgoing data connection (mobile originated CSD call)

Incoming data connection (mobile terminated CSD call)

SMS    

Voice connection   - 

   

- -  

Contract for data transmission

Contract for voice and data transmission

(call at data phone number required)

(call at voice phone number required)

8.1.2 GPRS

When using data services via GPRS, provider offer various contract options, especially regarding the pricing (basic price, basic data volume, billing unit). Please contact your provider for further information.

In general, GPRS providers bill every time a connection is terminated and daily at midnight (the provider will terminate the connection at this time), and all accumulated data are rounded to the billing unit.

We therefore recommend to select a rate which offers the smallest possible billing unit.

Many GSM/GPRS providers offer so-called M2M rates, which have an exact 1 kb billing matrix.

INSYS GPRS 5.0 serial GPRS General

Note

The transmitted amounts of data consist of the sum of application user data and the TCP packet data. The information from the TCP/IP packets also represents a network load and will add to the total costs.

For the entire data amount it is also important to select parameters adjusted to the application to form TCP packets. These parameters consist of:

The maximum set block value (default: 512 byte) (see AT**TCPBLOCK)

The maximum waiting period (AT**TCPAGG).

8.2 Network Design

The GPRS system is intended as additional service within the scope of the GSM system. The GPRS data exchange (GPRS = General Packet Radio Services) runs packet-oriented, based on the Internet Protocol (IP).

The following figure shows the basic design, where the application has to provide the TCP/IP/PPP stacks. This is required when using the standard GPRS functionality of the INSYS GPRS 5.0 serial.

Application

Mobile application

TCP

PPP/IP

GPRS Bearer

GPRS engine

GSM/GPRS

Engine

Router

(GGSN)

IP IP

GPRS Bearer

GPRS Net radio components and internal GPRS net

remote site

application server

TCP

GPRS General INSYS GPRS 5.0 serial

8.3 TCP Transparent

This function represents the main characteristic of the extended function. By means of the integrated TCP/IP stacks, the INSYS GPRS 5.0 serial functions as “modem emulation” for the application; the user data are provided transparently via the serial interface ("TCP transparent" connection).

There is no need for the application to process any additional protocol stacks.

To establish TCP connections to the INSYS GPRS 5.0 serial, it is necessary to access the IP address of the GPRS device. This function must be supported by the network operator or the provider.

Application

Mobile application

remote site

TCP

PPP/IP

GPRS Bearer

INSYS GPRS device

µController

GSM/GPRS

Engine

Router

(GGSN)

IP IP

GPRS Bearer

GPRS Net radio components and internal GPRS net

application server

TCP

Note

The integrated TCP/IP stack will establish a new GPRS connection for each “TCP transparent” connection, i.e. after the end/termination of the “TCP transparent” connection follows the calculation of the GPRS provider, where the data accumulated until then is rounded to the next billing unit.

This does not apply if the operating mode TCP Listen is activated; in this case, the GPRS context is preserved after the TCP connection is terminated, which means that the billing takes place only for a socalled forced billing by the provider (once a day) or during a controlled termination of the GPRS context by the device itself (periodic login/logout or device restart, termination of the connection and reconnection due to failed PPPIPCHECK, or deactivation of TCP Listen).

INSYS GPRS 5.0 serial GPRS General

8.4 IP Addresses/Accessibility

The IP address of the GPRS terminal is dynamically allocated by the provider and therefore only temporary. During the next dialin at the provider, a new IP address is allocated.

In almost all GPRS networks the IP address can not be accessed from outside as the providers perform the addressing for the switch from GPRS networks to the “normal Internet” via a NAT table (Network Address Translation) to manage the address area limited by IPV4.

These firewalls prevent the GPRS device or its IP address from being accessed by so-called "scanners". As GPRS is billed by the amount of data, this prevents unwanted and costly data traffic.

This also means that the following functions may not be possible:

 Pinging the GPRS device from outside

 Establishing TCP/IP connections to the GPRS device from outside

 Sending UDP/IP packets to the GPRS device from outside

All connections (channels) must be opened starting with the GPRS device. This means that the GPRS device or the application behind it can only react as CLIENT.

Exceptions to this restriction will be provided by the according provider, if available. Please also contact your provider to clarify if it is possible to use a VPN (Virtual Private Network) for possibly required server functionality.

GPRS General INSYS GPRS 5.0 serial

8.4.1 Fixed IP address and VPN connection

The service provider mdex (http://www.mdex.eu) offers the service "fixed.IP". With this service, one or more devices in a virtual private network can be addressed. SIM cards are thus grouped to form a closed network with a private IP address area. Connections from the company network to the devices will then be established via a VPN tunnel.

The service fixed.IP from mdex will enable GPRS devices to communicate with each other as well as with computers in the Internet via a VPN connection.

8.5 Data Rates

The INSYS GPRS 5.0 serial has the following characteristics:

 GPRS Multislot class 12

 GPRS End device class B

 Support of coding scheme 1 to 4

 PBCCH Support

GPRS has several classes (multislot classes) which are relevant for the transmission speed. The classes provide the maximum transmission speed for uplink and downlink.

The table below shows the number of time slots for the classes, which can be used for uplink, downlink, and for the device altogether.

GPRS devices support all variants up to their own Multislot class.

INSYS GPRS 5.0 serial GPRS General

Multislot class Downlink slots Uplink slots Active slots

4 TS

3 TS

4 TS

1 TS

2 TS

3 TS

4 TS

5 TS

The maximum possible data rate therefore depends on the multislot class of the device. The above table shows the available time slots (TS) of a device; the table below shows the maximum data rate. The data rate, on the other hand, depends on the used coding scheme (CS). This information is unfortunately not available for the user. The network providers use different coding schemes according to the reception situation.

1 TS

2 TS

3 TS

4 TS

9,05

18,1

27,15

36,2 53,6 62,4

4 TS

CS1

13,4

26,8

40,2 46,8

3 TS

CS2

15,6

31,2

2 TS

CS3 CS4

Data rates of PC data including GPRS control data

CS1 CS2 CS3 CS4

Data rates of PC data only (without GPRS control data)

21,4 42,8 64,2 85,6

1 TS

8 16 24 32 12 24 36 48 14,4 28,8 43,2 57,6 20 40 60 80

Note: The above mentioned values represent the theoretically maximum possible

values.

In practice, the following applies: GPRS will not provide guaranteed data rates or bandwidths for the application.

The values allocated by the network provider (coding scheme and time slots to be used) can change dynamically during a connection and, among other things, depend on the current amount of connections in the GSM cell.

In the device class B, the INSYS GPRS 5.0 serial supports the GSM services GPRS, CSD and voice. However, only one service can be executed at a time.

GPRS General INSYS GPRS 5.0 serial

8.6 Quality of Service (QoS)

The above mentioned characteristics data rates (in the form of values such as “data amount per hour” and maximum data amount) and delay times are, among others, a part of the Quality of Services.

Theoretically, there is a possibility for requesting a certain QoS profile from the provider during the connection setup via AT commands (AT+CGQREQ) or to define a minimum profile (AT+CGQMIN) which must exceeded by the QoS offered by the provider, in order to enable the device to establish the connection.

Experience has shown that these settings will not show any success regarding performance improvement, as the providers always supply "Best Effort” as QoS, i.e. the best values according to the current network load during the moment of the connection setup.

8.7 Delay Times

Usually, there will be marginally higher delays than with a "normal" connection via GSM.

The delays will mostly be below one second.

The average delay times are stated with 700 ms, for GSM values of 500 ms are assumed. In rare cases, delays of several seconds are possible; the applications at the GPRS end devices should therefore be set to maximum delay times.

INSYS GPRS 5.0 serial GPRS General

8.8 Calculation Examples for Data Transmission via GPRS

8.8.1 Application description

8.8.1.1 Design of the entire system

control center computer

INSYS

vitual

COM-

Port

control center

software

Data logger

RS232

INSYS GPRS

DEVICE

GSM/GPRS Net Internet

DSL / Modem

The system consists of a data logger with 8 digital inputs and 4 analogue inputs. The received data can be output in adjustable intervals at the RS232 interface.

The evaluation software at the control center computer will either communicate directly with the data logger via the RS232 interface, or via leased line modems for remote applications.

To save investment and maintenance costs (rent, ...) when using leased line modems, the connection should be made via a transparent GPRS modem.

This is what the INSYS GPRS 5.0 serial is used for. It is also used for leased line operation, i.e. after being switched on it will automatically attempt to establish a connection with the remote terminal, the INSYS virtual COM port. As soon as the connection is established, all user data from and to the data logger are transmitted via a transparent TCP/IP connection. No adjustment is required for the data logger and the control center computer.

GPRS General INSYS GPRS 5.0 serial

Application

8.8.1.2 Data logger user data

A data logger message has the following setup: Device ID 4 byte 2 x 8 bit for the digital inputs 2 byte 4 x 16 bit for the analogue inputs 8 byte Checksum 1 byte

Total 15 byte

8.8.1.3 User data acknowledge of the control center

As an option, the data logger/control center software can be configured so that for a data logger message an acknowledging message of the control center (user data acknowledge) is sent.

Set-up: Command (e.g. ACK) 1 byte Checksum 1 byte

Total 2 byte

8.8.2 General data amount

For GPRS, such as for all IP-based transmission methods, the user data of the application are packed into a TCP/IP message and sent to the remote terminal (PUSH); the TCP/IP stack of the remote terminal (e.g. Windows) must acknowledge each received TCP/IP message.

With GPRS, all data accumulated by the user from the IP level (incoming and outgoing) are calculated.

8.8.2.1 Transmission of user data without user data acknowledge of the remote terminal

GPRS modem

control center

Total: 95 byte

INSYS GPRS 5.0 serial GPRS General

Application

8.8.2.2 Transmission of user data with user data acknowledge of the remote terminal

GPRS modem

Total: 177 byte

8.8.2.3 TCP Keep Alive

Some GPRS providers terminate the connections when they are inactive. Vodafone, for example, terminates the connection after approximately 30 minutes without data transfers. For this reason, applications that exchange data in larger intervals should consider a Keep Alive timer. The TCP stack generates an empty TCP message in adjustable intervals which the TCP remote terminal responds to. This will satisfy the expectations of the provider regarding the amount of data. The INSYS GPRS 5.0 serial will provide this function.

The application will not notice this action.

control center

GPRS modem

Total: 80 byte

control center

GPRS General INSYS GPRS 5.0 serial

8.8.3 Calculation example

We assume a GPRS rate for data with a 1kilobyte billing matrix, as offered by TMobile and Vodafone as M2M rate.

Usually, GPRS network providers bill once daily, e.g. once a day the sum of all accumulated data since the last billing is rounded to the next billing unit (here: 1 kilobyte).

Example T-Mobile: Contract M2M Connect (Date: September 2005)

 Basic fee: 3.95 Euro / month  Data extension M2M Data 1 for 1 Mb free volume: 2.95 Euro / month  Data extension M2M Data 2 for 2 Mb free volume: 3.95 Euro / month  Data extension M2M Data 5 for 5 Mb free volume: 4.95 Euro / month  Data extension M2M Data 10 for 10 Mb free volume: 6.95 Euro / month

The following examples show merely the pure data transmission. When a TCP/IP connection is established via the INSYS GPRS 5.0 serial, data is also generated (128 byte). The INSYS GPRS 5.0 serial will not terminate a once established connection automatically, i.e. the amount of data for the connection setup may be ignored.

However, the following may occur:

 The remote terminal can no longer be reached (power failure in the control

center, system crash, new IP address for the control center, …)

 The GSM/GPRS network breaks down temporarily  The GPRS modem has a power cut

In all cases, the INSYS GPRS 5.0 serial will automatically attempt a new connection setup to guarantee the availability of the application (attempts in intervals of 20s, 80s, 320, 1280s, 1h, 1h, 1h, …).

For the M2M rates, for each (failed) connection setup attempt 1kilobyte amount of data may be assumed (at a 1 kilobyte matrix); it is therefore recommended to plan a reserve of 30 to 50 kb up to the according upper limit of the rate.

INSYS GPRS 5.0 serial GPRS General

Transmission of values every 15 minutes

 Without user data acknowledge

95 byte / 15 min  380 byte / 1 h  9120 byte / 24 h  rounded to 9 kb / day

 270 kb / month

The contract M2M Connect with M2M Data 1 is sufficient; at all events, there

is enough reserve available.

The monthly costs would be 3.95 + 2.95 = 6.90 Euro.

 With user data acknowledge

177 byte / 15 min  708 byte / 1 h  16992 byte / 24 h  rounded to 17 kb /

day  510 kb / month

The contract M2M Connect with M2M Data 1 is sufficient; at all events, there

is enough reserve available.

The monthly costs would be 3.95 + 2.95 = 6.90 Euro.

Sending SMS as Fax or E-mail INSYS GPRS 5.0 serial

9 Sending SMS as Fax or E-mail

Overview of network providers for German speaking countries (D, A, CH). All necessary information is available from the customer service center of the provider. (Subject to change)

9.1 SMS as Fax

Network Provider

T-Mobile (D1)

D2 Vodafone

E-Plus (E1)

T-Mobile

Swisscom

Coun

Service center

try

D +49 171 076 0000

D +49 172 227 0333

D +49 177 061 0000

CH +41 79 499 9000

CH +41 79 499 8123

9.2 SMS as E-Mail

Network Provider

T-Mobile (D1) D

Coun try

Service center

+49 171 076 0000 8000

Phone number

99 + dialing code + Phone number 99 + dialing code + Phone number 151 + dialing code + Phone number 6762 + dialing code + Phone number Dialing code + Phone number Dialing code + Phone number

Phone number

SMS format

Example

990941586920 This is a test

1510941586920 This is a test

67620941586920 This is a test

0941586920 *FAX#This is a test

Format

E-mail address Example

D2 Vodafone D

E-Plus (E1)

T-Mobile A +43 676 021 6761

Swisscom CH +41 79 499 9000 555

Swisscom CH +41 79 499 8123 555

+49 172 227 0333 3400

+49 177 061 0000 7676245

E-mail address + space + text

abc@defg.de

abc*defg.de This is a test

INSYS GPRS 5.0 serial GPRS Dial-in Parameters

10 GPRS Dial-in Parameters

Overview of network providers for German speaking countries (D, A, CH). All necessary information is available from the customer service center of the provider.

Note: In HSComm we prepared numerous European APNs for selection. (See also Chapter 5.2 - TCP Transparent (GPRS Modem Emulation))

Network Provider

T-Mobile (D1)

Germany

D2 Vodafone

Germany

E-Plus (E1)

Germany

O2 (E2)

Germany

T-Mobile

Austria

Swisscom

Switzerland

mdex

*) not required. **) any password required

APN

AT**GSMAPN=<apn>

internet.t-d1.de

Internet.t-mobile.de

web.vodafone.de

internet.eplus.de

surf.xxl.interkom.de

netcompany.interkom.de

gprsinternet

gprs.swisscom.ch

voyager.tda.t-d1.de

User name

AT**PPPUSER=<user>

*) *)

Password

AT**PPPPW=<pw>

See contract data

**) **)

eplus

*) *)

GPRS

gprs

See contract data

gprs

Gprs

FAQ INSYS GPRS 5.0 serial

11 FAQ

Problem: Possible cause: Remedy

The INSYS GPRS 5.0 serial does not log in:

No reaction to AT commands.

The location of the GSM antenna is incorrect.

PIN incorrect Use the HSComm to delete the PIN and to

The SIM card is blocked because the PIN was entered incorrectly three times.

The SIM card is not enabled.

The power supply is not sufficient.

The wrong interface has been selected in the settings for the serial interface.

There is another program running in the background which accesses the same serial interface.

Check the signal quality of the GSM network. For low field strength – below 12 – the antenna location should be changed.

enter the correct PIN.

A PUK must be entered to enable the card. Switch to the terminal program to enter the PUK

and enter the following command:

AT+CPIN=<PUK>,<new PIN>

Please contact the contact center of your provider.

Check the voltage supply using the information from Chapter 12 – Technical Data.

Check the interface settings

with the used COM port.

Terminate all programs running in the background.

INSYS GPRS 5.0 serial FAQ

Problem: Possible cause: Remedy

No reaction to AT commands.

The serial interface settings at INSYS GPRS 5.0 serial and at the application are not identical.

The INSYS GPRS 5.0 serial and the application (configuration PC or controller) must be operated at the serial interface with the same settings for baud rate and data format.

Check the settings of both interfaces!

Settings INSYS GPRS 5.0 serial:

Setting of the application - in our example a PC with the HSComm GPRS:

FAQ INSYS GPRS 5.0 serial

No Dialtone

Problem: Possible cause: Remedy

The manual selection of

ATD<ip>:<port> or

ATD<domain>:<port>

is not possible. After a few seconds, the messages No Carrier or are displayed.

The GPRS dial-in parameters have not been set correctly.

Step 1:

Read out all data using the button “Read settings” from the device and check the settings.

Step 2:

On the tab "TCP transparent" check the selection of the network provider.

For some network providers, PAP authentication is required.

Please find a selection of network providers for German speaking countries (Germany, Austria, Switzerland) in Chapter 11 “GPS Dial-in Parameters” or ask the customer center of your provider for the correct settings.

Step 3:

Change the settings, if necessary and restart the INSYS GPRS 5.0 serial.

Step 4:

Switch to the terminal program

and manually dial into the GPRS network. Enter the AT command ATD*99***1#. The successful connection setup is confirmed with the message Connect.

100

VEGA INSYS Modem User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual