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Motorola R2550 Service Manual

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$Page 72 REAR PANEL DC INPUT PORT Drawing shows pins as seen from a rear view of the Analyzer. Positive DC voltage must be between +11 and +18VDC. Either + pin may be: used for the positive DC voltage since these two pins are tied together at the 10 amP DC fuse. Q*O \ 62$

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							Appendix 
D
EXTERNAL  PORT PIN 
ASSIGNMENTS
RS.232  PORT
This  is 
a full 
bidirectional  RS-232 port 
with  the capability  to respond 
to a 
serial  input. 
The port 
serves  a
dual  purpose 
in that  if 
an  RS-232  is 
not  desired,  the port 
can  be used  as a printer 
outpu.t.  Software
determines  if 
the  port 
functions  as 
an  RS-232 
bidirectional  port 
or as an  output-only  printer 
port. 
25 pin
female  D 
connector  on 
Processor  Module for 
RS-232  interface  at the 
side panel. 
Drawing  shows pins 
as
seen  from 
a  side  view of 
the  Analyzer.
PIN I
2
3
4
5
6
7
89-r9
20
2t-25 GND
TXD 
(ransmit 
data)
RXD  (receive 
data)
RTS  (request 
to send)
CTS  (clear 
to send)
DSR  (data 
set ready)
SIG  GND  (signal 
ground)
DCD*  (data 
carrier  detect)
not  used
DTR*  (data 
temdnal  ready)
not  used DCD* 
(Data 
Canier  Detect) 
input is not 
used in
this  application.
DSR*  (Data 
Set Ready)  is 
a general 
purpose 
input
that  is 
used  for modem 
control.  This 
line is  not
used  when 
a printer 
is connected.
DTR*  (Data 
Terminal  Ready) 
is a general 
purpose
output  to  indicate 
the Analyzer  is  ready  to 
receive
more  data on the 
RXD  line.
RTS  x 
and  CTS  * 
(Request-To-Sen4  Clear-To-Send)
are  handshaking  signals  used in 
RS232  communica-
tions.
RXD  (Receive 
Data) input 
signal  is 
the  data  re-
ceived.  If 
this  connector  is 
used  as a printer 
output,
the  RXD  pin 
is not  used.
TXD  (Transmit 
Data) output  signal is 
the  data  being
transmitted.
lEil
L
61

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							REAR 
PANEL  DC 
INPUT  PORT
Drawing  shows pins 
as seen  from 
a rear
view  of the  Analyzer.
Positive  DC 
voltage  must 
be between  +11
and  +18VDC.
Either  + 
pin 
may  be: used  for 
the  positive
DC  voltage  since these two pins 
are tied
together  at 
the  10 
amP  DC fuse. Q*O
\
62

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