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BOCA PRO16 Reference Guide
Calling and Answering Using &L1
When operating in smart mode (&L1 set), the ATD and ATA commands
are used to initiate and answer calls respectively.
FYour modem will hang up and return to local command state if your
computer transmits characters while the modem is attempting to
establish or re-establish a connection (unless &N0 has been issued).
Auto Leased Line Operation (&L2 or &L3)
You can select Auto leased line operation with the &L2 or &L3 com-
mand. In Auto leased line operation you do not need to issue the ATA
command to answer a call, or the ATD command to initiate a call. Issue
the &L2 command to automatically select Originate mode, or the &L3
command to automatically select Answer mode.
In Auto leased line operation AT commands can only be entered while
DTR is low. Irrespective of the &D setting, your modem will remain in
idle mode when DTR is low, and will go on-line when DTR is high. If
DTR is lowered when your modem is on-line, it will hang up and return
to idle mode. If power is lost, your modem will enter on-line state when
DTR is restored.
FYour communications software must be capable of altering the state
of the DTR signal to work successfully with the &L2 and &L3 com-
mands.
Hanging Up
There are five ways of hanging up your modem when leased-line mode
is selected.
q If your modem is attempting to establish or re-establish a connection,
sending characters to it will cause it to hang up (unless &N0 has been
issued).
q If synchronous mode is selected, lowering the DTR signal will cause
your modem to immediately hang up.
q If asynchronous mode is selected, issuing the ATH command will
cause the modem to hang up.
q If asynchronous mode is selected (&L2 or &L3), lowering DTR will
cause the modem to hang up.
Synchronous Modes
Synchronous
Modes
pro16ref.pm6 6/14/96, 2:37 PM59
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