K. Interface Circuit
The interface circuit (refer Figure S-6) consists three kinds of signal – relay signal, RS232
series communication, and plug & play for Windows 95.
The communication port is a D type 9 pin connector and its pin definition is :
pin1 : N.C
pin2 : RS232 transmit
pin3 : RS232 receive
pin4 : connect with pin 6
pin5 : common
pin6 : connect with pin 4
pin7 : connect PC
pin8 : N.C
pin9 : N.C.
Figure S-9 RS232 circuit
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