Technical information
2.3.5
DFA01
Asynchronous Controller with Integral Modem
The
DFAOl
is
an
asynchronous serial controller
that
emulates
the
DZQll.
It
has
two lines, each
with
a DF224-compatihle
integral
modem.
Functional
Information
Supported
modulation
protocols
Split-speed
operation
Flow
control (XONIXOFF)
Supported
data
formats
Modem control
Ordering
Information
DFAOI-AF
Performance
Transmit
data
transfers
Receive
data
transfers
Transmit
buffer
size
Receive buffer size
Supported
baud
rates
Throughput
at
maximum
baud
rate
Bell103J
Be1l212A
CCITTV.22
CCITT V.22-BIS
Both
lines
No
8
programmable
formats
(each
with
1
start
bit)
• 5, 6, 7,
or
8
data
bits,
0
or
1
parity
bit,
and
1
stop
bit
• 5, 6, 7,
or
8
data
bits,
0
or
1
parity
bit,
and
2
stop
bits
Full
Field-installed
kit
Single-character
programmed
transfers
Single-character
programmed
transfers
One
character
for
programmed
transfers
64-character
FIFO
8
programmable
baud
rates:
50, 75, 110, 134.5,
150,300,1200,2400
1
1200 bytes/second
IThe
serial
line
is
capable
of
baud
rates
up
to
9600
baud.
However,
because
the
modem
is
restricted
to
speeds
of
0-300,
1200,
and
2400
baud,
all
other
baud
rates
are
considered illegal
and
pass
meaningless
data.
2-34
VAX
4000 Model 300 Technical Information