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RS-232C interface ∫ STX$ = CHR$(&H2): ETX$ = CHR$ (&H3): NAK$ = CHR$(15): ACK$ = CHR$(&H6) PRINT "*** RS-232C COMMUNICATION SAMPLE PROGRAM ***" PRINT "Type Command 'QUIT' to quit." PRINT REM *** Communication Port Initial & Open *** REM Port 1,9600Bps,No parity,8 bit data,1 stop bit OPEN "COM1:9600,N,8,1"...