Home › Magazines › 2000 › July › 8 Channel D/O Card for RS232

8 Channel D/O Card for RS232

Published in issue 290, July 2000

This article describes a card with 8 open-collector digital outputs for external connection to a PC serial port. The design of this card is based on direct accessing of the PC’s UART registers to adapt the communication from serial to parallel.A computer may have one to four serial ports (COM1 to COM4) where each port occupies eight locations on its memory map as shown in Table 1.

Components

Relevant products

Resistors:
R1,R2,R3 = 2kΩ2
R4,R5,R6 = 10kΩ
R7-R14 = 1kΩ
Capacitors:
C1,C2,C3 = 100nF
C4 = 330nF
Semiconductors:
D1,D2,D3 = 1N4148
D4-D11 = LED, high efficiency
D12 = 1N4001
IC1 = 4040
IC2 = 74HC573
IC3 = 74HC541
IC4 = ULN2803
IC5 = 7805
IC6,IC7,IC8 = 4N28 or CNY17-2
Miscellaneous:
K1 = 25-way sub-D socket (female), PCB mount
12 solder pins

Click below to download a PDF copy of this article from Elektor magazine.

	Downloads
	PDF Article (E007043.pdf)
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	PCB layout (004032-PCB.pdf)
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	Order from Elektor
	PCB
	004032-1
	Order from Eurocircuits
	PCB

Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

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8 Channel D/O Card for RS232

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8 Channel D/O Card for RS232

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