[Reference] On Serial/Parallel Loopback Tool
� The serial loopback tool and the parallel loopback tool are necessary for diagnostics of the serial communication line and the parallel communication line. Fabricate the serial loopback tool and the parallel loopback tool locally referring to the connection diagrams shown below.
Serial Loopback Tool : For diagnostics of serial port
SERIAL LOOPBACK CONNECTOR CONNECTION DIAGRAM
� Connector Types DB9S (Female) � Interface Standard RS-232C � Loopback Data & Handshake
DB9S DCD RX TX DTR GND DSR RTS CTS RI
NOTE: The black round mark "z" indicates soldering.
1 2 3 4 5 6 7 8 9
Parallel Loopback Tool : For diagnostics of parallel port
PARALLEL LOOPBACK CONNECTOR CONNECTION DIAGRAM
� Connector Types DB25P(Male) � Interface Standard Centronics � Loopback Status to Commands
DB25P -STROBE D0 D1 D2 D3 D4 D5 D6 D7 -ACK BUSY PE SLCT
NOTE: The black round mark "z" indicates soldering.
