Operating Modes (Command And Data) - Paradyne 3760 User Manual

Using Your Modem
Figure 3-1. Dial Data Network
Operating Modes (Command
and Data)
Before a modem goes online (establishes a successful
connection with a remote modem), it is considered to be in
Command mode, an idle state where you can modify its
operating parameters or issue modem commands. (Any
command issued is acknowledged with a response in either
words or digits. These are known as response codes and are
listed in Appendix C.)
Once the modems are online, either by answering or placing a
call, they automatically switch to Data mode. Data mode is a
state where any entries made from the computer are considered
data and are transmitted and received between modems. The
modems remain in Data mode until the connection is broken or
until they are forced into online Command mode using the
escape sequence (+++).
The escape sequence is a series of characters you type in to
switch from Data mode to online Command mode. Use the
escape sequence when you want to enter a command to the
modem while it is in Data mode. The connection between the
modems will not be broken. Think of the escape sequence as a
way to get the modem's attention when it is sending or receiving
data.
The escape sequence consists of three plus signs (+++). When
you enter the escape sequence, you must precede the +++ by a
small amount of idle time, known as an escape guard time.
3-2
Issue 1 November 1994