Vector 4 - Page 103

EXHIBIT
1I-18
PIN-OUTS
OF
SERIAL
INTERFACE
CONNECTORS
8251 8251 Signal 8251 Connect. RS-232 Signal Direction
Signal Function (Vector 4) | P1n—Quts at Connect, of Data
Classifie, [J1 |J2| J3 as seen by the Flow
Vector 4
DTE
CLK Internal CILK N/A N/A N/A
TXC Transmitter CLK * * NfiA
= RXC Receivgr CLK * * N/A
T TXD Transmitter Data 2 Transmitted Data Qut
O | XD Receiver Data 3 Received Data In
© | DIR Data Term. Ready 20 Data Term. Ready Cut
2 | DSR Data Set Ready 6 Data Set Ready In
, RTS Req. To Send Data 4 Req. To Send Data Cut
CTS Clear To Send Data 5 Clear To Send Data In
7 QD
o ICE
w | CIK Internal CLK N/A N/A N/A
- | ™XC Transmitter CLK *% ** N/A
< | RXC Receiver CLK e ** N/A
E TXD Transmitter Data 13/ Received Data In
| RXD Receiver Data =32 Transmitted Data Cut
< DIR Data Term. Ready 6 Data Set Ready In
T DSR Data Set Ready 20 Data Term. Ready Cut
w RTS Req. To Send Data 5 Clear to Send Data Cut
N CI‘S Clear To Send Data 4 Clear To Send Data In
7 GND '
Q N/A
% | ox Internal CIK N/al N/a N/A
o | X Transmitter CLK ***1 N/A N/A
m | RXC Receiver CLK ***! N/A N/A
> | XD Transmitter Data 6 N/A Qut
'i" RXD Receiver Data 2 N/A In
* These lines are tied to the Tl line coming fram the Timer Subsystem.
conjunction
with
the
appropriate
8251
initialization
software,
provides
a
300
Baud
rate
for
asynchronous
modem
operation.
A
Jumper
Area
is
provided
for
changing
these
lines
so
that
an
external clock can be used.
** These lines are tied to the T2 line caning from the Timer Subsystem.
conjunction
with
the
appropriate
8251
initialization
software,
provides
a
9600
Baud
rate
for
asynchronous printer operation.
***
These
lines
are
tied
to
a
group
of
circuitry
which
creates
a
specific
clocking
signal.
This
signal,
in
conjunction
with
the
appropriate
8251
initialization
software,
provides
a
300 Baud rate for asynchronous keyboard operation.
o 5-12
This signal,
This signal, in