The first command, Attention, signals to the modem that it is about to receive information, and the Dial Tone command instructs the modem to enable a line to dial out.
Note: Only install this driver when you connect the Bridgemate Pro server to a USB port using the Aten USB-serial converter which is supplied with the Bridgemate Pro server. The ATDT command is a signal to the modem that is interpreted as Attention Dial Tone. Unlike the traditional ping command, Test-Connection returns a Win32PingStatus object that you can investigate in Windows PowerShell, but you can. Version 3.4.62.295 of the Aten USB-serial converter driver has been successfully tested on 64-bit versions of Microsoft Windows 10/11. The modem should respond with a dial-tone or just a communication signal. Where X is the number of the serial port the modem is connected to or emulating.
If an MS-DOS-based application cannot be used, it is possible to test the modem connections by typing the following command at the MS-DOS command prompt There are also some handshake issues but if R/W is good you will at least be at a starting point. Now, you can either select the virtual serial ports from the dropdown list or specify them manually. You basically short pins 2&3 on the serial port connection then pull up hyperterm, tell it to use the port and anything you type should show up on the screen. Start the program and open the ' Pair ' window.
When you troubleshoot communications problems in Windows, an MS-DOS-level communications program is often required to test the modem and ports outside of Windows. Download Virtual Serial Port Driver and install it on your computer.