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CHAPTER 4: Manual Dial and Automatic Answer
4.6 Dial-Up Operation (336+ Only)
When your Series II Modem 336+ (MD1640A) is used as a dial-up
modem (DIP-Switch #10 in the UP position), it can both originate and
answer calls. To originate calls, you use the automatic dialing capability
of the Modem's Command mode.
To do this, use the computer or terminal keyboard to enter a few
command letters, followed by the phone number you wish to dial. If you
have a computer with sophisticated communications software, you may
end up talking back and forth with the software, and the software will
take care of talking to the modem.
It is still possible, however, to dial your data calls using a telephone set.
There are few reasons why you would want to do this, but if you have a
need to use the telephone set to dial, we explain how in the next
section. We will delay our coverage of Command Mode autodialing,
and all other Command Mode features, until Chapter 5.
4.7 Manual Call Origination
You can use the Series II Modem to both originate and answer calls.
To originate calls in Asynchronous mode, you will most likely use the
Modem's Command mode, and give the modem automatic dialing
commands (we will delay our discussion of the Command mode until
Chapter 5). When using your modem in Synchronous mode, the
Command mode is disabled, so you must automatically dial your calls
with a telephone set. To use manual dialing, you first connect an
ordinary telephone set (either touch tone or rotary dial) to the
modem's PHONE Jack, if you have not already done so. Next, set the
speed selection, (DIP-Switches #13 and #14), to the speed at which you
wish to communicate. These DIP-Switches are located on the side of the
modem. (Refer to Chapter 9 for DIP-Switch settings.) Your computer or
terminal may be set for up to 115,200 bps.
When your telephone set is connected, you can use it to dial the
modem you wish to call. Simply dial the number, and then listen to the
dialed modem's answer tone. When you hear it, press the Voice/Data
switch on the front of the modem down (to the Originate position). You
don't have to hold it down. Just "toggle it" (press it once and let it go).