- Then, your program will dial the number of the GSM modem. The command will be something like ATD12345679[CR]. You'll have to wait a bit and if everything goes well, the modem will reply with 'CONNECT[CR]' or eventually 'CONNECT 9600[CR]' (a speed indication appended) or even more information, but always something starting with 'CONNECT'.
- Log In Sign Up Read Contribute Search. Forum Categories. Can I send SMS from VB.NET with ZTE USB Modem? Programming Forum. I have seen people talking about doing the same with GSM Modem and I wonder if its the same thing (GSM & USB Modem).
- It is tested on a Nokia E63 using bluetooth communication and to a USB GSM Modem. So no prevention program can catch 100% of them. Mo sa vb.net na sending SMS.
- Sending And Receiving SMS From GSM modem. Ask Question 1. Browse other questions tagged vb.net serial-port gsm modem or ask your own question. 4 years, 9 months ago. 11,683 times. How can I get mutants to cooperate with a registration program?
We created a system in vb.net before. Wherein it send SMS notification and we used GSM Sim900d. We weren't allowed to use broadband (though it is possible to use it) because our Engineer instructors wants us to learn how to configure the hardware and for us to know how it works. Interfacing to Visual Basic applications. Programming SMS with a GSM Modem Setting and checking the SMS input. Make sure your Program.cs file has the following.
Using VB.NET I need to send a SMS using GSM modem to a mobile phone.
Currently I have the following code:
The thing is, it seems that this code is not working.
Can you check if this is correct or not. Or just give me some threads which can help me with this.
Bugs1 Answer
This code works for me and can send a message to your phone:
Note; this code I tried and received message from my phone like this; '?????#$??#????'.
Bugs
Not the answer you're looking for? Browse other questions tagged vb.netsmsgsmmodem or ask your own question.
Introduction
There are many different kinds of applications SMS applications in the market today, and many others are being developed. Applications in which SMS messaging can be utilized are virtually unlimited. Some common examples of these are given below:
- Person-to-person text messaging is the most commonly used SMS application, and it is what the SMS technology was originally designed for.
- Many content providers make use of SMS text messages to send information such as news, weather report, and financial data to their subscribers.
- SMS messages can carry binary data, and so SMS can be used as the transport medium of wireless downloads. Objects such as ringtones, wallpapers, pictures, and operator logos can be encoded in SMS messages.
- SMS is a very suitable technology for delivering alerts and notifications of important events.
- SMS messaging can be used as a marketing tool.
In general, there are two ways to send SMS messages from a computer / PC to a mobile phone:
- Connect a mobile phone or GSM/GPRS modem to a computer / PC. Then use the computer / PC and AT commands to instruct the mobile phone or GSM/GPRS modem to send SMS messages.
- Connect the computer / PC to the SMS center (SMSC) or SMS gateway of a wireless carrier or SMS service provider. Then send SMS messages using a protocol / interface supported by the SMSC or SMS gateway.
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In this article, I will explain the first way to send, read, and delete SMS using AT commands. But before starting, I would like to explain a little bit about AT commands.
AT Commands
AT commands are instructions used to control a modem. AT is the abbreviation of ATtention. Every command line starts with 'AT' or 'at'. That's why modem commands are called AT commands. There are two types of AT commands:
- Basic commands are AT commands that do not start with a '+'. For example, D (Dial), A (Answer), H (Hook control), and O (Return to online data state) are the basic commands.
- Extended commands are AT commands that start with a '+'. All GSM AT commands are extended commands. For example, +CMGS (Send SMS message), +CMGL (List SMS messages), and +CMGR (Read SMS messages) are extended commands.
If you want to get more information about AT commands, then you can get it on my other article on CodeProject here: http://www.codeproject.com/KB/system/IntroductiontoATcommands.aspx.
Operating Modes
The SMS specification has defined two modes in which a GSM/GPRS modem or mobile phone can operate. They are called SMS text mode and SMS PDU mode. (PDU stands for Protocol Data Unit.) The mode that a GSM/GPRS modem or mobile phone is operating in determines the syntax of some SMS AT commands and the format of the responses returned after execution.
I am using SMS text mode in this article.
How to Test GSM Modem Connectivity Using Hyper Terminal
- First, find the best GSM modem that suits the needs. I tested this application with a Wavecom FASTRACK M1206.
- Understand the AT Command set required to communicate with the modem.
- Connect the modem to the computer according to the setup guide specified in the manual provided with the GSM modem.
- Put a valid SIM card into the mobile phone or GSM/GPRS modem.
- Connect your mobile phone or GSM/GPRS modem to a computer, and set up the corresponding wireless modem driver.
- Run the MS HyperTerminal by selecting Start -> Programs -> Accessories -> Communications -> HyperTerminal.
- In the Connection Description dialog box, enter a name and choose an icon you like for the connection. Then click the OK button.
- In the Connect To dialog box, choose the COM port that your mobile phone or GSM/GPRS modem is connecting to in the Connect using combo box. For example, choose COM1 if your mobile phone or GSM/GPRS modem is connecting to the COM1 port. Then click the OK button.
- The Properties dialog box comes out. Enter the correct port settings for your mobile phone or GSM/GPRS modem. Then click the OK button.
- To find the correct port settings that should be used with your mobile phone or GSM/GPRS modem, consult the manual of your mobile phone or GSM/GPRS modem.
- Type 'AT' in the main window. A response 'OK' should be returned from the mobile phone or GSM/GPRS modem.
- If “OK” returns, it means your mobile phone or GSM/GPRS modem is connected successfully.
Vb Programming For Gsm Modem
After successful connection of the GSM /GPRS modem with PC, you are ready to run this application. Download the attached project and run the application.
Sending SMS through GSM Modem using AT Commands
Port Settings
In this tab, you will have to do port settings which will be the same as you did in the hyper terminal and then click the OK button. If the modem is connected successfully, a message box will appear with the message “Modem is connected”.
Send SMS
In the second tab, you can send SMS:
Read SMS
In the third tab, you can read SMS:
Delete SMS
In the fourth and last tab, you can count the number of SMS and delete SMS as well.
Points of Interest
I'm not using any third party library or anything else in this project.
History
- 4th August, 2009: Initial post.