Verilink Productivity 500 (34-00236) Product Manual - Manual (Page 27)

AT Command Operation 500 TA Page 27
Chapter 5 AT Command Operation
GENERAL
This chapter provides information on how to use the AT commands to operate
and configure the 500 TA via the PC connection (DTE port). The entire 500 TA
AT Command Set is contained in
Appendix C . "PC" as used in this chapter
refers both to PCs with terminal emulation software (such as Windows Termi-
nal) and terminals themselves.
AT COMMAND STATEMENT
The 500 TA communicates with a PC asynchronously any time the DTE port is
configured for AT command mode. When the 500 TA is powered up, and if the
DTE port is configured for AT commands, the 500 TA enters the AT command
mode. AT commands can then be used to configure and control the 500 TA.
The command statement is typed using the PC keyboard.
The command statement must be typed in a specific form for the 500 TA to
recognize and follow the instruction. The command statement begins with the
letters AT, is followed by one or more commands which can each consist of a
sequence of keyboard symbols such as & and %, letters, numbers, and is then
followed by a return or end-of-line character.
AT COMMAND MODE
AT commands can be issued only when the DTE port is configured for the AT
command mode. Normally, the DTE port is in the AT command mode when-
ever it is off-line. After the 500 TA connects with another TA and goes into the
online data mode, characters sent to the 500 TA by the PC are interpreted as
data (not as commands) and are transmitted to the remote TA.
ESCAPE SEQUENCE + + +
If the 500 TA is in the asynchronous data mode the escape sequence can be
sent to return the 500 TA to the command mode and remain online. The escape
sequence consists of a pause (normally 1 second), three escape characters, and
then another pause. The default escape sequence characters are ‘+ + +’.