Chapter 3 – Using the Front Panel
Multi-Tech Systems, Inc. MT5600BA-V92 User Guide 25
Advanced Options

RS232 OPTIONS

The following LCDs are used to configure the RS-232 interface.
DTR OPTIONS
Use the Æ and Enter buttons to select how the modem responds to the high to
low transition of the DTR signal sent by the computer. DTR NORMAL causes the
modem to hang up; IGNORE DTR allows operation with computers that do not
provide DTR; and RESET ON DTR È causes the modem to perform a soft reset
as if the Z command were received. Same as the &D0, &D2, and &D3
commands.
CARRIER DETECT OPTIONS
Use the Æ and Enter buttons to select whether CD will be forced high (CD
FORCED ON) or whether it will go high when the remote modem’s carrier signal
is detected, and go low when the carrier signal is not detected (CD NORMAL).
Same as the &C0 and &C1 commands. When using callback security on UNIX
systems, select CD LOW IN CB to force CD low until the proper callback security
password has been entered or until a disconnect occurs. This prevents the UNIX
login prompt from being displayed before the callback security ENTER
PASSWORD prompt appears. Select CD NORMAL IN CB to disable this feature.
Same as the &C5 and &C4 commands.
LINUX OPTION
The connect message will display after the proper callback security password is
entered.
CTS OPTIONS
Use the Æ and Enter buttons to select whether the CTS sta te w ill fol low the
RTS state when on line (CTS NORM) or whether CTS will always be high
(CTS ON). Same as the &R0 and &R1 commands.

DIALBACKUP/LL OPTIONS

The following LCDs are used to configure dial backup for four-wire leased line operation.
For more information, see Chapter 4, “Leased Line Operation.”
DIAL BACKUP NUMBER
Use to enter a dial backup number. To scroll through a list of digits and
characters, press the Ç Å and È buttons. To go to the next position, press the
Æ button. To back up or to exit without saving, press the Æ button several times.
To save the number, press the Enter button. Note: Only 16 characters can be
displayed at a time. To see characters 17–30, press the È button. To go to the
previous LCD, press the Å button. To go to the next LCD, press the Æ button.
TIME TO RESTORE (S15)
Sets the leased line restore attempts occur when the modems are in dial backup
mode. The restore time interval can be set from 10 to 255 minutes in one minute
increments. A value of 0 disables dial backup. Same as the S15= command.
DIALBACKUP TIME (S17)
Use to set how long the modem waits after a leased line failure before it attempts
a dial backup connection. The timer can be set from 1 to 255 minutes in one
minute increments. Same as the S17= command.