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DIAGRAMS AND REFERENCE MATERIALS
11.
Serial Port (RS-232C) Check
HEV.A
This module performs a loop-back check of the serial port (RS-
232C port).
Before starting this check, attach the loop-back connector to
the serial port.
The pin connection of the 9 pins loop-back connector is as
folIows:
+---------------------+----------+----------+-----------------+
l
Signal Name
lPIN NumberlPIN Number:
Signal Name
l
+---------------------+----------+----------+-----------------+
: Transmit Data
:
3
<------)
2
l
Receive Data
:
: Request To Send
:
7
<------)
8
:
Clear To Send
:
: Data Terminal Ready :
4
<------)
6
:
Data Set Ready :
+---------------------+----------+----------+-----------------+
(Output Signal)
(Input Signal)
After attaching the loop-back connector to the serial port,
issue the instruction to start this check.
+-----------------------------------------------------------------+
SERIAL PORT CHECK
Attach loop-back connector to serial port.
Enter Y to start this check when connector is attached, or
Enter N to return to the menu.
+-----------------------------------------------------------------+
The procedures for checking the serial port are as folIows:
1)
Input/Output Check of MODEL Control Signal
a.
Data Terminal Ready (DTR)
=
0 and Request to Send (RTS)
=
0
are output, then the Data Set Ready (DSR) and Clear to Send
(CTS) signals are input.
The results are OK if both DSR and CTS equal "0".
An error
message is displayed
i f
either signal equals "I".
When DSR
=
1:
+-----------------------------------------------------------------+
I
I
I
I
:
Error code
=
1101
:
:
ERROR DTR DSR, DSR ALWAYS HIGH
:
I
I
I
I
+-----------------------------------------------------------------+
7-78
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