User's Manual

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).