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[Reference] About Special Tools for Serial/Parallel Loopback
• Special tools are needed when self-diagnosis for serial circuits or parallel circuits is to be performed. Prepare special tools as
required, referring to the following connection diagrams.
Serial loopback tools: For testing the serial port
SERIAL LOOPBACK CONNECTOR CONNECTION DIAGRAM
• Connector Types DB9S (Females)
• Interface Standard RS-232C
• Loopback Data & Handshake
Parallel loopback tools: For testing the parallel port (for the printer)
PARALLEL LOOPBACK CONNECTOR CONNECTION DIAGRAM
PCGA-PSX1 (U/C)
• Connector Types DB25P(Males)
• Interface Standard Centronics
• Loopback Status to Commands
DB25P
-STROBE
1
2
D0
3
D1
4
D2
5
D3
6
D4
7
D5
D6
8
D7
9
-ACK
10
BUSY
11
PE
12
SLCT
13
Note : • Soldering
DB9S
1
DCD
2
RX
3
TX
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI
Note : • Soldering
14
-AUTO FD
15
-ERROR
16
-INT
17
-SLCT IN
18
GND
GND
19
20
GND
21
GND
22
GND
23
GND
24
GND
25
GND
2-2
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