Multi-Tech Systems BL-Series manual 113

Chapter 9 - DIP-Switch Settings

Switch #11

"AT" Responses/Multi-Tech Responses (Asynchronous Mode/Leased line/Dial-Up)

In Asynchronous mode, you can set the modem to respond with Result Codes according to the "Multi-Tech" command response set (Switch #11 in the DOWN position), or to "AT" command response set (Switch #11 in the UP position). The &Q command performs the same function (choosing AT or Multi-Tech Result Codes), and is explained further in Section 5.3 of this manual.

"AT" Responses (&Q1)	=	Switch #11 UP
"Multi-Tech" Responses (&Q0	=	Switch #11 DOWN
Factory Default Setting	=	DOWN

Switch #11

Internal/External Clocking

(Synchronous Mode/Leased Line/Dial-Up)

In Synchronous mode, the transmit clock can be supplied by the DTE on pin 24 of the RS-232C/V.24 interface by placing DIP-Switch #11 UP. Place DIP-Switch #11 in the DOWN position to enable DCE to control clocking (internal clock via pins 15 and 17 of the RS-232/V.24 interface).

External Clock (pin 24)	=	Switch #11 UP
Internal Clock (pins 15/17)	=	Switch #11 DOWN
Factory Default Setting	=	DOWN

Switch #12

Asynchronous/Synchronous Operation -- "Sync"

(Asynchronous/Synchronous Mode/Leased Line/Dial-Up)

The modem can operate in either Asynchronous mode or Synchronous mode. In Synchronous mode, start and stop bits are eliminated. The modem's internal clock circuits on the RS-232C/V.24 pins 15 and 17 are activated. The modem's Command mode is not accessible in Synchronous mode. This switch is a means to alternate and to access either mode. In Synchronous mode, you may want to set the RTS forcing and CTS forcing DIP-Switches so that both of signals act normally (not forced on).

Synchronous Operation	=	Switch #12 UP
Asynchronous Operation	=	Switch #12 DOWN
Factory Default Setting	=	DOWN

Switches #13 and #14

Speed Switches

(Synchronous Mode/Leased Line)

DIP-Switches #13 and #14 are used to set the modem’s data transmission rate. Switches #13 and #14 are used in combination, typically in leased-line and call origination applications.

Note: The modem baud rate command ($MBn) overrides the setting of these speed selection switches (DIP switches #13 and #14).

2834 Series:
28800 bps Operation	=	Switch #13 UP and Switch #14 UP
19200 bps Operation	=	Switch #13 DN and Switch #14 UP
14400 bps Operation	=	Switch #13 UP and Switch #14 DN
9600 bps Operation	=	Switch #13 DN and Switch #14 DN
Factory Default Setting	=	Switch #13 UP and Switch #14 UP

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