CASIO-FX_PC INTERFACE

NOTA: Esta lista está em inglês atendendo à divulgação pretendida!

	3 diodes					1N4148
	1 voltage regulator 5V				uA7805
	1 integrated circuit				MAX232 16 pin DIP
	3 resistors					22 Ohm
	C1 electrolytic capacitor			220 uF 16V
	C2 electrolytic capacitor			47  uF 16V
	C3 capacitor (ceramic or polyester)		100 nF
	C4,C5,C6,C7 electrolytic capacitors		22  uF 16V
	1  RS232 - 9/25 pin interface

	J2 TIP or Fifth Upper Pin 			(from PC to FX9700/FX8N0P
)	J1 Middle or  Seventh Lower Pin 		(from FX9700/FX8N0P to PC)
	J3 Sleeve or LowerRight 			(Ground)
	On the FX9700 use a 				2.5mm JACK

     	PINOUTS OF MAXIM 232:	  			  ---_---
       			  			+C7	--|     |--  VCC
	 	     			   (+V) +C6	--|     |--  GND
    		  (GND)    			  -C7	--| 	|--  T1 OUT
     			  			+C5	--|	|--  R1 IN
     			  			-C5	--|	|--  R1 OUT (MIDDLE)
	 	     			   (-V) -C4	--| 	|--  T1 IN  (TIP)
 		       			     T2 OUT	--|	|--  T2 IN
 		        		      R2 IN	--|	|--  R2 OUT
	  			  			-------

	Indicated capacitors above are all electrolytic 22uF !
PIN CONVERSIONS BETWEEN MAX AND RS232 ARE AS FOLLOWS:
			    10 TTL   in ---->   7 RS232 out
			    11 TTL   in ---->  14 RS232 out
			     8 RS232 in ---->   9 TTL   out
 			    13 RS232 in ---->  12 TTL   out
 

16 Vcc is 4.5 to 5.5 Volt9 PIN vs 25 PIN EQUIVALENCE:
	 			DB9   	   DB25
    				 ______________
				        |
			DCD	  1     |     8
			RXD	  2     |     3
			TXD	  3     |     2
			DTR	  4     |     20
			SG	  5     |     7
			DSR	  6     |     6
			RTS	  7     |     4
			CTS	  8     |     5
			RI	  9     |     22

PLEASE NOTE : On the PC use any modem like communications program that uses the Serial Port, For Example Windows Terminal. On my calculator I use CAS/CASPORT >=0.4.2 by Tom Wheeley. There's also an older QBasic Program and Circuit by Bob/Robert Parish for this purpose widely available and successfully tested. As COM1/9 is usually occupied by the mouse, you may prefer to use COM2/25.

Lúcio M.M. Quintal - Madeira - Portugal