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e
11
U
e
Ir
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It
It
rt
0,
d
11
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is
bit 3
bit 2
Low-Level Modem Command Dictionary
Strip Parity.
If this bit is set, the modem will strip off the parity bit of
incoming data bytes for all 7-bit data formats
(F
0-3).
If this bit is clear,
the modem will show parity errors by setting the parity bit for any data
bytes with a parity error.
St rip
~~.
If this bit is set, the modem will strip off any received
~~
characters from the received data stream.
bit
1
St rip
~b.
If this bit is set, the modem will strip off any received
P~b
(ASCII
li7)
characters from the received data stream.
. ............. .
bit
0
St rip
HUL.
If this bit is set, the modem will strip off any received
HQ~
(ASCII
0)
ch.aracters from the received data stream.
. .......... .
bit 3
bits
2-0
Prompt
Mode.
Whenever the modem transmits a
ea,
it will stop
transmitting until it receives a
J<4
character from the remote computer. If
~4
is not the same as
K?,
the modem will strip off any
J<S
characters
received between the carriage return and the
R4
character. Prompt Mode
has higher priority than Transmitter XON/XOFF Protocol.
Bu ffe r Pa rt
it
ion.
The receive buffer
block size
is
8*(1 +buffer
parti t ion).
The
block size
is used in Receiver XON/XOFF Protocol to
specify when the modem should transmit a
~§
character, and in
Transmitter ENQ/ ACK Protocol to specify how often the modem should
transmit an
~NQ
character .
If the receive buffer overflows, received data is ignored until the number of
bytes in the receive buffer drops below 56.
Then the buffer overflow
response
(OV)
is placed in the buffer, and receiving continues.
Transmitter XON/XOFF Ready Character and Prompt Character.
Transmitter XON/XOFF Not Ready Character.
Receiver XON/XOFF Ready Character.
Receiver XON/XOFF Not Ready Character.
Strip Character.
All
eight parameters taken together constitute the
handshake protocol
specifier.
The eight
parameters are set to
E039~9:$9
when the modem is initialized, where
9
represents control-Q
(~n
and
~
represents control-S
(pq~).
Their current values are preserved while the modem is off.
• The modem will behave unpredictably if
~4-K~
are defined as the command character.
• The
K
command specifies handshake protocols that can cause modem deadlock. If you are using
Transmitter XON/XOFF, Transmitter ENQ/ ACK, or Prompt Mode protocols, you should write your
program so that it can detect and respond to deadlock.
K
will not change protocols if the modem is
deadlocked (see "Modem Deadlock" in Section 2).
Responses: none
8S
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