Chapter 1 – Introduction

Chapter 1 – Introduction

AT commands are used to control the operation of your modem. They are so called because each command must be preceded by the characters AT to get the ATtention of the modem.

AT commands can be issued only when the modem is in command mode or online command mode.

•The modem is in command mode whenever it is not connected to another modem.

•The modem is in data mode whenever it is connected to another modem and ready to exchange data.

•Online command mode is a temporary state in which you can issue commands to the modem while connected to another modem.

To put the modem into online command mode from data mode, you must issue an escape sequence: Type +++ and wait for the OK response. Then issue the following command AT<CR>. <CR> indicates that you must click Enter). To return to data mode from online command mode, type the command ATO.

To send AT commands to the modem you must use a communications program, such as PhoneTools, a communications program included with your modem, or HyperTerminal in Windows 95, 98, NT 4.0, Me, 2000, XP. You can issue commands to the modem either directly or by typing them in the terminal window of the communications program. You issue them indirectly by configuring the operating system or communications program to send the commands automatically. Fortunately, communications programs make daily operation of modems effortless by hiding the commands from the user. Most users, therefore, need to use AT commands only when reconfiguring the modem; e.g., to turn autoanswer on or off.

The format for entering an AT command is ATXn, where X is the command and n is the value for the command, sometimes called the command parameter. The value is always a number. If the value is zero, you can omit it from the command. Thus, AT&W is equivalent to AT&W0.

Most commands have a default value, which is the value that is set at the factory. Default values are provided with each command in the AT Commands section.

You must press Enter to send the command to the modem.

Any time the modem receives a command, it sends a response known as a result code. The most common result codes are OK, ERROR, and CONNECT. For a table of valid result codes, see the “Result Codes” sections of this manual.

You can issue several commands in one line, in what is called a command string.

The command string begins with AT and ends when you press Enter. Spaces to separate the commands are optional; they are ignored by the command interpreter. The most familiar command string is the initialization string, which is used to configure the modem when it is turned on or reset, or when your communications software calls another modem.

Multi-Tech Systems, Inc. AT Commands Reference Guide (S000273G)

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Multi-Tech Systems MT5600BA-V92 manual Introduction, You must press Enter to send the command to the modem
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MT5600BA-V92 specifications

Multi-Tech Systems MT5600BA-V92 is a versatile communication device designed for efficient data transmission over telephone lines. It is highly regarded for its reliability and performance in various applications, including point-of-sale transactions, remote monitoring, and data acquisition. One of the key features of the MT5600BA-V92 is its ability to operate at data rates of up to 56 Kbps. This high-speed modem ensures rapid data transfer, making it suitable for businesses that require quick and efficient communication.

The device supports V.92 technology, which enhances the performance of dial-up connections. V.92 provides features like cheaper call setup times, reduced latency, and improved upload speeds compared to older standards. This makes the MT5600BA-V92 an ideal choice for users who need enhanced data performance without investing in more complex networking infrastructure.

Another significant characteristic of the MT5600BA-V92 is its analog communication capabilities. The modem utilizes standard analog telephone lines for connectivity, allowing easy integration into existing telephony systems. This compatibility ensures that businesses can leverage their current infrastructure without needing substantial upgrades.

The MT5600BA-V92 integrates several features for improved functionality, including error correction and data compression technologies. These features enhance the reliability of data transmission by ensuring that lost or corrupted data packets are retransmitted, while compression reduces the amount of data sent over the line, further optimizing performance.

The modem is designed with user-friendliness in mind; it features a straightforward installation process and an intuitive configuration interface. Furthermore, it is compact and robust, making it suitable for diverse environments ranging from retail outlets to industrial applications.

The MT5600BA-V92 is also known for its durability and long life cycle, which is crucial for businesses that rely on continuous operations. Additionally, its ability to operate effectively in various conditions solidifies its position as a dependable communication solution.

In summary, the Multi-Tech Systems MT5600BA-V92 is an advanced modem that combines high-speed data transmission, analog compatibility, and robust error correction features. Its reliable performance and user-friendly design make it an excellent choice for businesses looking to enhance their communication capabilities while utilizing existing telephone infrastructure.
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