HP 82718A Expansion Pod Reference Manual page 85

Low-Level Modem Command Dictionary
Note:
Q
represents control-Q
(~:~)
and
§
represents control-S
(~~)
.
• The I command will not reset the modem to its default state if the modem is deadlocked (see
"Modem Deadlock" in Section 2).
• ItH T I AL I ZE " : t'1ODt'1"
must be used instead of the I
command if the command character is not known or if
U
(UN LISTEN ) command).
(INITIALIZE) low-level modem
o
has been executed (see the U
Responses: none
K (KONTROL)
I
K handshake protocol specifier
CS=CHRS(17)tCHRS(19)tCHRS(17)RCHR$(19)RCHRS(17)
t'10DClUT
II
~'~K E~]::::
II
g.:CSg.:CHF.:S ( 1 ::::)
Sets the serial handshake protocol. The
handshake protocol specifier
consists of 8 single-byte
parameters, called
JK~-~~.
The first three parameters determine the handshake protocol, parity error
behavior, and receive buffer block size. Each of these three parameters are single hex digits (a-F), defined
by setting or clearing its component bits according to the particular requirements of your application. All
the bits taken together constitute the single hex digit for that parameter. (In the descriptions below, note
that bits are numbered
a
to 3, from right to left.) The last five parameters are definable characters that
are used in conjunction with the different handshake protocols. Each of the last five parameters can be
any 7-bit ASCII character except
l~
(backspace-ASCII 8 or control-H),
~,~~
(cancel-ASCII 24 or
control-X), comma, or carriage return. Note that since these are 7 - bit characters, they will not be
recognized as protocol or strip characters if they appear with a parity error.
84
Character Bit Description
Transmi t ter XON/XOFF Protocol. A received
~p
character will halt
data transmission by the modem, and a received
~~
character will restart
da ta transmission by the modem.
bit 2 Receiver XON/XOFF Protocol. When the number of bytes in the
receive buffer exceeds the block size, the modem will transmit a
K]
character. When the number of bytes in the receive buffer drops to zero,
the modem will transmit a
~~
character.
bit I Receiver ENQ/ ACK ProtocoL The modem will respond to a received
~~q
with an
~~~
when its receive buffer becomes empty.
bit 0 Transmitter ENQ/ACK Protocol. When transmitting, the modem will
transmit an
~Nq
character after sending
block size
characters, and stop
transmitting. The modem will resume transmitting when an
~¢~
is
received.
$