Models MT5600ZDX & ZDXV

The Modem Does Not Respond to Commands

4Make sure the modem is plugged in and turned on. (See “None of the LEDs Light When the Modem Is On.”)

4Make sure you are issuing the modem commands from the data communications software, either manually in terminal mode or automatically once you have configured the software. (You cannot send commands to the modem from the DOS prompt.)

4Make sure you are in terminal mode in your data communications program, then type AT and press ENTER. If you get an OK response, your connections are good and the problem likely is in your phonebook entry or session settings. Be sure your modem is not in data mode when you type a command. Use the escape character sequence to switch to terminal mode. The default escape sequence must wait at least one second, enter +++, and pause another second or more before entering a command.

4The E0 and Q1 commands may be in effect, disabling echo and responses. Verify this with the &V command. To enable echo and responses, enter ATE1Q0<cr>.

4Try resetting your modem by turning it off and on. Make sure there is a reset command (&F) in your initialization string, or your modem may not initialize correctly.

4If you don’t get an OK, the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications programs connect to the COM port automat- ically. Some connect when the software loads and remain connected until the program terminates. Others can disconnect without exiting the program. Many communications software packages also allow multiple terminals to be open, but only one can access the modem at a time. If your package reports that it cannot make a connection, yet the modem’s TR indicator is on, click on the Window menu to see if more than one terminal is open. The modem’s TR indicator shows that the software has made a connection with the modem through the COM port.

4Your communications software settings may not match the physical port the modem is connected to. The serial cable may be plugged into the wrong connector—check your computer documentation to make sure. Or, you may have selected a COM port in your software other than the one the modem is physically connected to—compare the settings in your software to the physical connection.

4If the modem is on, the cable is plugged into the correct port, the communications software is configured correctly, and you still don’t get an OK, the fault may be in the serial cable. Make sure it is firmly connected at both ends.

4Is this the first time you have used the cable? If so, it may not be correct. Check the cable description on the packaging to make sure the cable is the right one for your computer.

4Peripheral expansion cards, such as bus mouse and sound cards, may include a serial port preconfigured as COM1 or COM2. The extra serial port, or the card

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Multitech MT5600ZDXV manual Modem Does Not Respond to Commands
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MT5600ZDXV, MT5600ZDX specifications

The MultiTech MT5600ZDX and MT5600ZDXV are state-of-the-art modems designed to offer reliable communication capabilities for a variety of applications. These devices are particularly favored in industrial, telecommunications, and enterprise settings due to their robust performance and versatility.

One of the standout features of the MT5600ZDX series is its ability to support both analog and digital signaling. This dual compatibility enables seamless integration with existing telecommunication infrastructure, making it an ideal choice for businesses looking to upgrade without overhauling their entire system. With ITU-T V.34 modem technology, these devices support high-speed data transmission rates of up to 56 kbps, ensuring quick and efficient data transfer.

The MT5600ZDX and MT5600ZDXV models come equipped with a comprehensive array of communication protocols, including PPP, TCP/IP, and the unique Multitech proprietary protocols. This broad compatibility allows for easy connection to various networks and devices, facilitating smooth data exchange across platforms.

Another notable feature is the built-in error correction and data compression capabilities. With technologies such as MNP, V.42, and V.42bis, users can expect enhanced data integrity and faster transmission speeds, which are particularly crucial in environments with high noise levels or signal interference. These features make the modems highly effective for remote monitoring applications, telemetry, and point-of-sale terminals.

Additionally, both models excel in terms of connectivity options. The MT5600ZDX includes a standard RS-232 interface, while the MT5600ZDXV offers an enhanced V.24 interface for those requiring additional communication flexibility. This variety in connectivity options ensures that users can integrate these devices into a wide range of systems, whether for industrial automation or remote data acquisition.

Durability and reliability are also core characteristics of the MT5600ZDX series. Designed to operate in challenging environments, they boast a wide operating temperature range and robust casing, making them suitable for deployment in harsh industrial conditions.

In conclusion, the MultiTech MT5600ZDX and MT5600ZDXV modems provide a feature-rich solution for organizations seeking high-performance communication. With advanced technologies, exceptional versatility in connections, and reliability in demanding settings, they continue to stand out as preferred choices for efficient industrial communication solutions. These devices not only enhance operational efficiency but also pave the way for future-proof connectivity in an increasingly digital world.
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