Making A Callback; Ignoring An Incoming Call During A Callback Sequence; Lead Operation If A Port Is Configured For Modem Control; Outputs - Black Box Programmable Security Guard Manual

4.5.4 M C
AKING A ALLBACK
The PSG will first disconnect any existing
connection to a remote modem. The PSG will then
raise its DTR output (remember, RTS output is
always active), and then send the predetermined
dialing string. This string should be comprised of
your modem's command to make the call and the
telephone number to dial.
The PSG will monitor DCD input for one minute.
If DCD input does not become active within this
time limit, then the PSG will assume that no remote
modem exists at this location and it will abort the
callback. If DCD input does become active, then the
unit will assume that it is connected to the remote
modem.
4.5.5 I I
GNORING AN NCOMING
C S
ALLBACK EQUENCE
After the unit disconnects a call, but before it starts
transmitting the dialing string to the modem, it will
ignore RI input. It will not raise its DTR output to
answer the call. After disconnecting the call, the
unit will wait for the amount of time defined by
Option Switch S3, positions 6 and 7, before
transmitting the dialing string.
4.6 Lead Operation If a Port is Configured for
Modem Control
The operation of the control leads in this
configuration depends upon the mode the
unit is in.
4.6.1 O
UTPUTS
Table 4-2 shows the output leads when the modem
controls are enabled.
CHAPTER 4: Operation
C D
ALL URING A
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