14
BOCA PRO16 Reference Guide
The , (comma) dial modifier causes the modem to pause for a short time
after dialing 0. This allows most PBXs sufficient time to obtain a line
before dialing.
The factory default delay for the , modifier is two seconds. You may
change the length of this delay if necessary. Its length is determined by
the value in S Register 8.
Another method of making the modem wait for a dial tone is to include
the W dial modifier. The W modifier causes the modem to examine the
phone line to ensure a dial tone has been applied before dialing starts:
ATD0W12345
If the modem cannot detect a dial tone within the time specified by S
Register 7, the modem will return to local command state and send a NO
DIALTONE message to the computer (if either the X2, X4, or X5
commands have been issued).
Due to differences with some older telephone exchanges, dial tone
detection may not be possible with your modem. Your modem will only
recognize dial tones between 200 Hz and 600 Hz.
If your telephone line supports tone dialing then a useful dial modifier
is the T modifier. Inserting a T modifier before the number you are
dialing causes the modem to tone dial that number. For example:
ATDT12345
This will cause the modem to dial the phone number 12345.
The modem also supports a P dial modifier which allows it to pulse dial.
These modifiers may be placed at any point in the number you are
dialing and they may be intermingled in the same number.
For example, your telephone line may be connected to a PBX that
supports tone dialing internally, but only pulse dialing externally. You
could overcome this problem by using the T and P dial modifiers in the
following way:
ATDT0,P12345
The modem tone dials 0 to request an external line, waits for the PBX to
obtain the line and then pulse dials 12345.
Getting Started
Getting Started
pro16ref.pm6 6/14/96, 2:36 PM14
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