What should you watch out for when selecting a modem for use with SIMATIC S7 TeleService?
For SIMATIC TeleService you need one modem on the Service PG/PC and under circumstances one modem on the TS Adapter on the remote plant. The latest TS Adapter versions have an integrated modem (as from TS Adapter II), but for special cases also allow you to connect an external modem via an RS232 serial interface.
You can use virtually any standard, commercially available modem with SIMATIC TeleService provided it understands and works with the Hayes "AT" commands.
- Selecting a modem for the TS Adapter on the plant
We recommend using one of the latest TS Adapter with integrated modem. You should only connect an external modem to the TS Adapter if the integrated modem is not suitable for the local telephone system or for the purpose intended (sending SMS texts, for example). In the case of all TS Adapter versions (TS Adapter I/II/IE/TS Module RS232), you can only use the serial RS232 interface to connect an external modem. To this you can connect and operate standard modems, ISDN terminal adapters or GSM wireless modems with a serial RS232 interface. It is not possible to operate an internal and an external modem at the same time.
- Selecting a modem for the Service PG/PC
Which modem type to select depends primarily on the PG/PC's interface (RS232, USB, for example) and the physical telephone system (analog, ISDN or GSM). Many new PG/PCs no longer have a serial interface (COM), for example, so you can no longer operate such modems or only with an adapter.
There must also be a device driver installed for the modem you are using on your Service PG/PC, which is supported by the operating system and the modem. The TeleService software has transparent access to the device driver installed in Windows.
If your customer is using an ISDN modem (or "ISDN TA") with an ISDN telephone system on the plant side, the counterpart (the PC/PG side) must also have an ISDN modem installed in an ISDN system. This rule applies to analog modems too and is independent of the use of TeleService. Communication between an ISDN TA (TA = Terminal Adapter) and an analog modem is not possible.
If either the plant or the PG/PC side is using different telephone technologies (ISDN/analog), you can use a hybrid modem. These devices support ISDN and analog technology. They are installed physically on the S0 bus of an ISDN telephone system.
An alternative is to install two separate devices (ISDN and analog modems) on an ISDN telephone system so the PC side, for example, can respond appropriately to the technology of the other side.
An extra A/B converter can be installed in the ISDN telephone system for this purpose. An A/B converter permits you to use analog terminal devices like an analog modem, for example. In this way it is possible to integrate conventional analog terminal device in an ISDN system. For further inquiries on this topic, please get in touch with your telephone system provider.
Buying a modem
When buying a modem, find out whether the modem can be used in the intended country. Modems are still subject to national licensing regulations.
In some cases it makes more sense to buy the modem in the country where it is to be used. This gets around the problem of having the right connectors to fit the local telephone sockets. If an unlicensed modem is used, it may not recognize incoming calls.
Check with the modem manufacturer or dealer whether the modem has or requires an explicit certification for telecommunications.
Worldwide use of the internal modem in the TS Adapter version II/IE/TS module
The modem in the TS Adapter versions TSA II/TSA IE/TS Module II modem is designed to be used worldwide. When installing and operating a modem, please observe the country-specific legislation and special requirements.
A list of countries is given in the manual of each TS Adapter type. This list shows the countries for which telecommunication certification has been made.
A relevant list of countries is also in each of the manuals for the TS Adapter versions TS Adapter II ISDN, TS Adapter IE ISDN, TS Module ISDN and TS Module GSM.
Recommendation for using a modem in conjunction with TeleService and TS Adapter
Below is a list of modem types that are known to support TeleService application in conjunction with the TS Adapter. Experience has been gained from the following sources:
- System test
- Own use
- Positive feedback from users
The TS Adapter used on the plant has the task, among others, of parameterizing the integrated modem or the modem that was installed on the serial RS232 interface (TS Adapter). For this purpose, it sends the following initialization string ex works (AT commands) via the serial cable to the modem.
AT &F E1 L1 M1 Q0 V1 &C1 S0=1 (displayed with spacing for better reading. The initialization string without spacing is stored in the TS Adapter).
More information about this is available in the TeleService manual.
The meanings of the AT commands are available in Entry ID 17907350.
External analog modem types with serial RS232 interface
|Modem type||Init string in the TS Adapter:
(default = AT&FE1L1M1Q0V1&C1S0=1)
|devolo MicroLink 56k i (industrial modem)||default||http://www.devolo.com/|
|SINAUT MD 3||AT&FE1L1M1Q0V1&C1\N0S0=1||
See Entry ID 24045211
|Westermo TD-36 (for 35mm DIN rail)||default||http://www.westermo.de|
|Westermo TDW-33 (for 35mm DIN rail)||default||http://www.westermo.de|
ISDN modem types with serial RS232 interface
|Modem type||Init string in the TS Adapter:
(default = AT&FE1L1M1Q0V1&C1S0=1)
|devolo MicroLink ISDN i (ISDN modem/ terminal adapter for industrial use with RS232 interface)||default||http://www.devolo.com/|
|SINAUT MD 4||ATE1L1M1Q0V1&C1S0=1||See Entry ID 16971000|
|Westermo IDW-90 (for 35mm DIN rail)||default||http://www.westermo.de|
|BM-33k6/ISDN per hybrid modem||default||http://www.blatzheim.com|
The requirement for applying TeleService is that the ISDN devices listed here are addressed with a modem driver supporting the B channel X.75 protocol. This device driver is normally included in the modem delivery package (disk, CD, configuration tool). With few exceptions only, devices are set to the X.75 protocol ex works.
ISDN TAs for the PG/PC side
|ISDN TA Name||Remarks|
|AVM FRITZ! Card PCI *)||http://www.avm.en|
|AVM FRITZ! Card USB v2.x *)||http://www.avm.en (discontinued)|
|BM-33k6/ISDN per USB. Hybrid modem with RS232 serial interface and additional USB interface||http://www.blatzheim.com|
|ISDN TAs, for which there are not 64-bit drivers.||You must install a standard modem (33600 bps, for example) and set the protocol (X.75, for example) and MSN under Properties > Advanced.|
|ISDN-TA PrimuX USB||http://www.gerdes-ag.de/en/products/primux/soho/
Required driver: PrimuX USB
*) Remarks on the AVM FRITZ!Card:
In order for TeleService to use the AVM FRITZ!CARD optimally you must also install the AVM ISDN CAPI port driver. If this driver is not already installed on your PC, you can download the driver directly from the download area at AVM (http://www.avm.en).
The AVM ISDN CAPI port driver for various Windows operating systems is available there under "Download > More Downloads > For the FTP server > Programs > capiport"
The driver incorporates your AVM hardware into the operating system of your PC. A specific CAPI driver is required for each operating system. The CAPI 2.0 interface of the driver controls the communication of the application programs with the AVM hardware and has all the performance features of the EURO-ISDN connection.
You can use the AVM ISDN CAPI port driver in the 32-bit versions of the Windows XP, Windows Vista and Windows 7 operating systems, but not in their 64-bit versions.
After installing the AVM ISDN CAPI port driver you have various virtual modems (software modems) at your disposal. The three listed below are suitable for the TeleService application.
|AVM ISDN CAPI Port Modem
(only in 32-bit Windows)
|AVM ISDN Analog Modem (V.32bis)||Suitable for establishing connections to a TS Adapter with internal or external analog modems.
|AVM ISDN Mailbox (X.75)||Suitable for establishing connections to a TS Adapter with internal or external ISDN TAs.
|AVM ISDN Custom Config||Suitable for establishing connections to a TS Adapter with internal or external GSM modems.
If you do not install the AVM ISDN CAPI port driver you only have the AVM NDIS WAN CAPI driver available.
|AVM ISDN CAPI Modem
(in 32-bit and 64-bit Windows)
|AVM NDIS WAN CAPI driver||Suitable for establishing connections to a TS Adapter IE with internal or external ISDN TAs.
Analog modems for the PG/PC side
|USRobotics 56K USB Modem, Model 5637||http://www.usr.com|
|Modems, for which there are not 64-bit drivers.||You must install a standard modem (33600 bps, for example) and set "Ignore dial tone" under Properties > Advanced. In most modems this is done with the AT command ATX3.|
GSM modem for the TS Adapter versions TS Adapter II and TS Adapter IE
|SINAUT MD720-3 GSM/GPRS MODEM||See Entry ID 30330207|
It may be quite possible that one or the other type of modem is no longer commercially available. In the course of technological advancement of the devices, older types are replaced by new ones.
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