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Z02205
Modem Controller ZiLOG
22 PS001000-MOD0599
ESCAPE SEQ UENCES
An escape sequence is defined as one or more particular
characters sent from the terminal to the modem during the
On-Line st ate. This sequence is activated to s witch the mo-
dem to the command state so modem commands may be en-
tered during a telephone line connection. The Escape Se-
quence char acte rs are ty pical ly sent t o the other modem as
data.
An escape sequence should not occur accidentally during
an exchange of dat a between two mo dems. Unfort unately ,
it is i mposs ible to guar ant ee that any esca pe s eque nce will
never occur naturally, because there are no restrictions on
the data or timing between characters sent between two mo-
dems during the On-Line state.
The only method of switching from the On-Line state to the
Command state that never occurs naturally during an ex-
change of data is the Data Terminal Ready signal (the &D1
command). The terminal has complete control of this signal
and it is not part of the data exchanged between the modems.
The Hayes Escape Sequence was adopted by many modem
manufact urers and communication programs before Hayes
was granted a patent for the escape sequence guard times.
Now the unpatented TIME INDEPENDENT ESCAPE SE-
QUENCE (TIES) has gained popularity with many modem
manufacturers.
TIES Escape Sequence
TIES was developed by a number of modem manufacturers
in response to Hayes enforcing patent rights for their escape
sequence guard time patent.
The Time Independent Escape Sequence, is a sequence of
3 escape characters (+ characters by default). When these
characters are recognized, the modem enters the COM-
MAND state without sending a confirming result code to the
terminal. The modem then starts a prompt delay timer. From
that point:
If one of th e recognized AT commands is receive d be-
fore the timer expires, the timer is stopped, the command
is executed, and its result code is sent to the terminal.
If any other data is received whil e the timer is running,
the timer is stopped , the mod em returns to the On -Line
state, and the received data is sent to the other modem.
If the timer expires, a confirming result code is sent to
the terminal, indicating the modem is in the Command
state.
The escape character and prompt delay timer can be
changed by writing new values to S-registers S2 and S12.
CARRIER DETECTION
After Handshaking, the modem determines if a telephone
line c onne cti on ex ists b y de tec ting t he ca rrie r si gnal from
the other modem. If the carrier is not detected for a long
enough period of time, the modem assumes the telephone
line connection with the other modem has been broken. The
modem uses S-register S9 to determine how long a carrier
must be prese nt before it is detected. The modem uses S-
register S10 to det ermine h ow long a c arrier i s not dete cted
before the telephone line is hung up.
BLACKLISTING MANAGEMENT
Blackli st ing applies s epar at el y to each number di al ed, and
indicates the call blocking capability for specific phone
number s. To save Z02205 RAM, calls are t reated as if they
are all to the same number.
The first connection attempt after modem reset or a suc-
cessful connection is always allowed. If a connection at-
tempt is not successful, then each following connection
attempt is c heck ed as follow s:
1. If voice answer was detected too many times the
attemp t is not allo wed, Modem Result Code indicates
the call is BLACKLISTED.
2. If the attempt occurred too quickly (within the inter-
call timing period) then the attempt is not allowed,
Modem Result Code indicates the call is DELAYED.
3. If there is a blacklisting period limiting the number of
attempts that may be made within the period, and too
many attempts have been made, then the attempt is not
allowed, Modem Result Code indicates the call is
either DELAYED (if a call may be made later), or
BLACKLISTED (if no call may be made later).