User's Manual

3. Make sure the correct terminal emulation mode is being used in the software

(refer to software manual).

5.4 Modem experiences errors while on-line with a remote

modem

1. Make sure Call Waiting is turned off.

2. Make sure RTS/CTS hardware flow control is enabled (do not use XON/XOFF

software flow control when transferring binary files).

3. Make sure the data speed is not faster than your computer's capability. Most

IBM compatibles are capable of 19,200 bps under DOS and Windows 3.x.

Operating at higher speeds under Windows requires a faster CPU (386 or

better).

5.5 Modem exhibits poor voice record or playback.

1. Make sure the correct modem type is selected in the Voice/FAX software.

2. Make sure your computer is fast enough to handle voice operations (38.4

Kbps). Voice operations are CPU intensive and require a 386/33 or better CPU

when running under MS Windows.

Section Six - AT Command Set

6.1 Executing Commands

Your modem is in Command Mode upon power-on and is ready to

receive and execute “AT" commands. The modem remains in Command

Mode until it makes a connection with a remote modem. Commands may

be sent to the modem from an attached terminal or a PC running a

communication program.

This modem is designed to operate at common DTE speeds ranging

from 115.2 Kbps to 300 bps. All commands and data must be issued to the

modem using one of the valid DTE speeds.

6.2 AT Commands & Format

All commands must begin with the AT prefix, followed by the command

letter and ended with the ENTER key. All default settings are printed in

bold text. Spaces are allowed in the command string to increase

command line readability but are ignored by the modem during command

execution. All commands may be typed in either upper or lower case, but

not mixed. A command issued without any parameters is considered as