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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