Multi-Tech Systems ISIHP-2U - Manual (Page 137)

MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 137
Terminal Adapter AT Commands & S-Registers
computer and responds to AT commands. There is no data communications
link with a remote device.
Data Mode
The TA enters data mode when it makes a successful data communications
link with a remote device. In data mode, the TA can send and receive data,
but it does not respond to AT commands. Instead, it treats them as data, and
transmits them to the remote device.
Online Command Mode
In online command mode, the TA responds to AT commands while
maintaining a data communications link; however, transmission of data is
suspended. To enter online command mode from data mode, type the escape
sequence +++AT<cr>. To return to data mode from online command mode,
type ATO<cr>.
Making a Call
Before you can place a data call, you must configure the TA for the local
switch type, serial port speed, and the data type of the ISDN device you
want to call.
Dialing
To dial a number using AT commands, you must first start a data
communications program. In the program’s terminal mode, type
ATDxxxxxxx<cr>, where xxxxxxx is the telephone number you want to
dial, and <cr> is the carriage return character that is sent when you press
ENTER , e.g, ATD7853500<cr>. The dial string can contain up to 80
characters.
To make it easier to read the dial string, you can use hyphens, spaces or
parentheses. These characters are ignored by the TA. For example, the TA
would read the following dial strings the same way:
ATD16127853500 <cr>
ATD 1-612-785-3500 <cr>
ATD 1 (612) 785-3500 <cr>