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Making an RS232-C
Interface Cable
DTE
to
DTE Cabling
Computer Side
Printer
Side
Pin
#
Protective
Ground
Transmit Data
----~
Receive
Data
.. • - - - -
1
2
*
3
c;
i
Signal Ground
7
Busy Monitoring Line
..
•1-----
11
~2~
Protective
Ground
Transmit Data
Receive Data
Request
to Send
Clear to Send
Signal Ground
Printer's Busy
Line
Data Set
Ready
Data Terminal
Ready
*connect only when using STX/ETX-ACK or X-ON/X-OFF
protocol (
©
or
@
)
and
eliminate
the connection to the
Busy Monitoring Line.
RS232-C Local Test
After you've configured an interface cable for your computer
and printer, you may want to spend a few
extra
minutes
designing
a
test cable, shown below, to monitor the operation
of the
RS232-C
interface. Once you've designed
the
cable,
set the switches on the
high
speed board as shown and follow
the instructions below:
TD
2
SW9
OFF
RD
3
SW10 OFF
4
RTS
SWl 1 OFF
CTS
5
CD
8
SSD
11
DTR
20
6
DSR
Figure C-1
1.
Connect
the test
cab le
to the interface
connector.
2.
When the
setting
is
completed,
turn the power ON
and
the
seria
l
interface
wil
l
check
the memory
function
of
C-5
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