Multi-Tech Systems BL-Series manual DIP-Switch Option Settings, DIP-Switch Settings, 109

Chapter 9 - DIP-Switch Settings

9.2DIP-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 DTR forced On Factory Default Setting

=Switch #1 UP

=Switch #1 DOWN

=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

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