Motorola V.34-SDC Using the AT Automatic Calling Unit ACU, Using the Modem with an Async Terminal

Using the AT Automatic Calling Unit (ACU)

Getting Started

ATZ4

?

To connect the modem to an asynchronous terminal—a terminal without

software— or a PC running an asynchronous communications software package, you use the modem’s AT Automatic Calling Unit (ACU) interface.

The AT ACU is compatible with:

•The industry-standardAT command set (AT and AT& commands)

•The Motorola enhanced AT command set (AT* commands)

AT commands define how the modem is configured, how it makes calls, and what test operations it performs. The AT command set lets you configure and operate modem options and features from the PC or asynchronous terminal keyboard.

Using the Modem with an Async Terminal

If you are connecting the modem to an asynchronous terminal, you can use the AT ACU to configure parameter options from the keyboard. Learn the AT command syntax in order to generate the appropriate AT commands.

Where Do I Go from Here?

To continue configuring the modem from an asynchronous terminal, refer to:

•Chapter 4 for configuration instructions.

•Chapter 5 to learn AT command syntax.

•Chapter 6 for a discussion of common problems and how to correct them.

•Appendix A to change configuration options. The Reference Card shows the complete menu structure.

(The modem also supports an ITU-TS V.25bis ACU for initiating calls from an asynchronous or synchronous DTE, described later in this chapter.)

3-8 Getting Started