Filter
Top Products
128
SERIES II INTELLIGENT DATA/FAX MODEMS
Figure 9-2. Series II Modem 336+ (MD1640A) PC Board
9.2 DIP-Switch Option Settings
Switch #1
Forced DTR -- "DTR"
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)
The Series II Modem must have a high DTR signal in order to operate.
DTR is provided to the modem by the terminal or computer to which it
is attached, through pin 20 of the RS-232C/V.24 interface. If your
terminal or computer is not providing DTR to the modem, you can
force the DTR signal high with DIP-Switch #1.
DTR function normally = Switch #1 UP
DTR forced On = Switch #1 DOWN
Factory Default Setting = UP
OPEN
1 2 3 4 5 6 7 8 9 10 11 12
OPEN
13 14 15 16
FRONT
16-position DIP switch
Voice/Data
switch with
Answ/Orig
Power switch
Power jack
RS/232/V.24
connector
Volume knob
Leased-ine jack
Dialup jack
Phone jack
Speaker
REAR
LEDs