For
HP
Internal Use
Only
Table 4-10. 92219Q Cable Pin-out
Computer
Signal
Modem
End
Name
End
2
TD
3
I
3
IRD
2
I
8
RTS
4
22
CTS
5
20
DSR
6
6
DTR
20
9
RI
22
4 and 5
DCD
8
23
FS
23
7
GROUND
7
The
pinout for
the
A1703-63006 cable is
the
same except
that
pin 9 on
the
computer
end
is
routed
to
pin 12
on
the
modem end
and
that
Line functions as
Rate
Select (RS).
This
cable is only used
with
the
A1703-60003
SCSI/Console/LAN
Multifunction
I/0
interface for
V.22bis/V.25bis applications.
Multifunction 1/0 PCA Modem Line Behavior
CCITT Mode -
AP
protocol 0
This protocol is known as HP-UX
CCITT.
The
card
waits for RI before raising
DTR.
It
also raises RTS when
it
raises
DTR.
If
DSR
does
not
come up within
25
seconds,
DTR
goes
back down.
The
connection also depends on CTS
and
DCD. DCD can drop for up
to
400ms
before
the
connection will drop. CTS
must
stay
high always. Once CTS drops,
the
connection
starts
to
drop. A new connection cannot occur
until
DSR, DCD
and
CTS
all drop. FS can be
programmed
to
either
state
via
the
CA
command.
Bell Mode -
AP
protocol 1
This is sometimes called Bell simple protocol. It raises
DTR
when
it
can accept a connection.
The
connection is valid when
it
sees DCD. It drives RTS whatever
it
was when Remote is
enabled (usually,
RTS is low)
and
does
not
look
at
DSR or CTS.
When
a disconnect is done,
DCD must drop before a new connection can
be
made
(i.e.
it
will
not
raise
DTR
until DCD
drops).
CCITT
_BIS
Mode -
AP
protocol 2
This protocol is
CCITT
V.22bis. It requires
the
special cable A1703-63006 which is
just
like
the
92219Q cable
with
the
exception
that
pin 9 on
the
computer
end is
routed
to
pin 12 (RS)
rather
than
pin 22 (RI).
DTR
is raised whenever a connection is allowed. RTS follows DSR. A
connection is established when
DSR
is high. CTS can drop for
an
indefinite
amount
of
time
without
dropping
the
connection.
The
card will
not
send
data
to
the
modem
when CTS is
Configuration 4-25
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