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+5V +5V R11 U2D 74HC04 9 8 LED NOT REQUIRED C5 V6 0.1uF C212 10K U2A 74HC04 1 2 2N2222 R3 6.2K 11 +5V R2 Q1 +12V

CTS OFF

+5V +5V R11 U2D 74HC04 9 8 LED NOT REQUIRED C5 V6 0.1uF C212 10K U2A 74HC04 1 2 2N2222 R3 6.2K 11 +5V R2 Q1 +12V
CTS OFF
1.2K NOT REQUIRED
C1 0.1uF R1
C2 0.1uF 16 U1 V+ 2
C3 1 0.1uF C4 4 H1 1 2 3 4 5 CD DSR RxD RTS TxD CTS DTR RI Key GND 6 7 8 9 0.1uF 5 13 8 3 C1+ C1C2+
Logic
RS-232 HeaderDTE
RS232
7 GND 15 MAX232A 3 74HC04 10 U2B 4 330pF
R4 3.6K C6 1 2 13 R5 220 74HC27 U4A 12 +12V P1 1 2 3 HEADER 3 U4B U3B U4C 9 10 11 R6 10K 74HC27 C8 0.01uF R10 51 NOT REQUIRED U3D 12 11 13 74HC08 R9 10K Q2 8 4 6 5 330pF 74HC08 R7 220 74HC27 NOT REQUIRED C7 3 4 5 6 H1 R8 10K
2N2222
1N4148 D2 +12V 1N4148 + C9 10uF, 10V
78L05
Title R S 2 3 2 t o O p en Collector Converter with Collision Detection (revision 1.0) Size B Date:
Document Number
Rev 1.0 Sheet
Thursday, May 10, 2001