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RS232 Serial Cable and Industrial Modems

This page provides information about the use of an RS232 data cable, as well as about some of the most reliable GSM devices you can attach to your computer for SMS messaging using the Ozeki NG - SMS Gateway software.

In order to send and receive SMS messages from your PC, you can attach your phone to the PC with a phone-to-PC data cable (Figure 1). The cable is attached to the serial port of your computer. The serial port is located on the backside and has 9 pins. The name of the serial port in your operating system is COM1 or COM2.

Figure 1 - Attaching the device to the PC with a phone-to-PC data cable.

If you have different options (e.g., Serial, USB, IR, BT connection), choosing the serial cable is the best choice. An RS232 serial data cable is a simple and reliable tool. Industrial GSM modems used in environments where performance and reliability are crucial are always connected using RS232 cables.

If you wish to build an environment where continuous operation is important, you should use an industrial GSM modem (Figure 2):


Wavecom provides very fast and reliable modems for a good price. These modems need an external GSM antenna, an RS232 data cable. Just like the Siemens MC35, they can be connected directly to the power supply of your PC. To find out more about the modem, check out the Wavecom Fastrack page. To find out how to attach a Wavecom modem and how to install a standard modem driver, check out the Installation of a Wavecom modem page.

Fargo Maestro 20

Fargo Maestro is a reliable GSM modem. You can read more about it on the Maestro 20 page.

Fargo Maestro 100

Fargo Maestro is also a reliable GSM modem. You can read more about it on the Maestro 100 page.


An excellent GSM phone released by Siemens. It can be connected directly to the power supply of the PC. It uses an external antenna, and it has a standard 9 pin RS232 interface. You need a standard RS232 "mouse extender" cable to connect this device to the PC.

NOKIA 30/ Nokia 32

Nokia 30 is also an excellent GSM phone. You can read more about it in its installation guide: Nokia_30_UG_en_.pdf

Figure 2 - Industrial GSM modems

To find out more about suitable GSM devices, check out the Supported Phones page.

More information

Next page: Installing the standard modem
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