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Chapter 9 - DIP-Switch Settings
9.2 DIP-Switch Option Settings
Switch #1
Forced DTR -- "DTR"
(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)
The 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
Switch #2
Flow Control - &E4/&E5
(Asynchronous Mode/Leased Line/Dial-Up)
With Hardware Flow Control, the modem uses its RS-232C/V.24 interface to control the flow of data
from the computer or terminal to which it is attached. The CTS signal on Pin 5 of the RS-232C/V.24
is brought low to stop the flow of data, and is brought high to restart it. Place DIP-Switch #2 in the UP
position to enable Hardware Flow Control (&E4). Xon/Xoff Flow Control (&E5) is another flow control
method. Xon/Xoff characters in the data dictate the start and stop of data flow from the computer or
terminal. Place DIP-Switch #2 in the DOWN position to select Xon/Xoff Flow Control.
Hardware Flow Control (&E4) = Switch #2 UP
Xon/Xoff Flow Control (&E5) = Switch #2 DOWN
Factory Default Setting = UP
Switch #2
SDLC/BSC Option
(Synchronous Mode/Leased Line/Dial-Up)
Synchronous Data Link Control (SDLC) and Binary Synchronous Control (BSC) are two error
correction protocols used in the IBM Mainframe environment. Place DIP-Switch #2 in the UP position
to enable SDLC mode, and place DIP-Switch #2 in the DOWN position to enable BSC mode.
SDLC Mode = Switch #2 UP
BSC Mode = Switch #2 DOWN
Factory Default Setting = UP
Switch #3
Enable/Suppress Responses -- "Q"
(Asynchronous Mode/Dial-Up)
In some Asynchronous mode applications, you may want to suppress all responses from the modem.
Place DIP-Switch #3 in the DOWN position to enable Result Code responses (Q0). Place DIP-Switch
#3 in the UP position, and answer mode is handled without responses and echo turned off (Q2), but
originate is still intelligent.
Enable Responses: Originate/Answer (Q0) = Switch #3 DOWN
Suppress Responses: Answer (Q2) = Switch #3 UP
Factory Default Setting = DOWN