Optional
• High-resolution graphics board
• Serial port RS-232C
• Auto answer modem (Model
4P
only)
Serial
Interface
One
Port:
• Allows asynchronous or synchronous transmission
• Conforms
to
the RS-232C standard
• Uses the D8-25 connector
on
the bottom of the Model 4
display console
and
on
the back of the Model
4P
The D8-25 connector pin-outs
and
signals available are listed below:
Signal Function
Pin#
PGND Protective Ground 1
TD
Transmit Data 2
RD
Receive Data 3
RTS
Request to Send 4
CTS Clear to Send 5
DSR Data Set Ready 6
SGND Signal Ground 7
CD
Carrier Detect 8
DTR
Data Terminal Ready
20
RI
Ring
Indicator
22
STDt
Secondary Transmit Data (Model 4 only) 14
SUNt
Secondary Unassigned (Model 4 only) 18
SRTSt
Secondary Request
to
Send
19
t These signals
are
not used for secondary functions but are reserved
for future
use.
Parallel
Interface
• Connection to a line printer via the 34-pin connector
on
the
bottom of the Model 4 display console
and
on
the back
of
the
Model4P.
• Eight data bits are output
in
parallel
• Eight data bits are input
•
All
levels are TTL compatible
A-42
To Next Page
Loading...
