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CHAPTER 4: Manual Dial and Automatic Answer
4. Manual Dial and Automatic Answer
4.1 Introduction
We’ll assume that yours is the very common application, where you are
using a Series II Modem to dial up a remote computer. The Series II
Modem has been factory preset for originating a call to a compatible
33,600 bps modem (also set up for hardware flow control, V.42 error
correction, V.42bis data compression and CTS/RTS operation). If the
answering modem is not set up similarly, the Modem automatically
adjusts to the appropriate protocol.
4.2 Dialing/On-Line/Answering
There are several basic steps for “originating” and “answering” in data
communication mode:
1. Load communication software
2. Dial
3. Establish On-Line connection
4. Terminate Call
A simple way to dial is from the keyboard of your computer or terminal.
You enter a command on the keyboard to tell the Series II Modem to
dial.
If you use a sophisticated communications software package, the
software tells you to enter phone numbers and other information. If
this is the case, the software, and not you, gives the dialing commands
to the modem. All of the commands, option registers and intelligent
features of the Series II Modem are taken care of by the software.
If you are giving commands directly to your modem (and not through
your software), each command must begin with AT (A
Ttention
Characters). AT characters may be entered in upper or lower case.