Common serial interface circuit design highlights TOP6 - circuit diagram reading every day (118)

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Six common serial port circuit diagram design. If you are a Win95/98/Me operating system, then the first and second are the most suitable and easy to make. If it is a Win2000/XP operating system, the third is the most suitable. Of course, if your computer has only 25-pin serial port, you can choose the fourth one. The FMS interface uses the parallel port or serial port on the computer, and there are many kinds of actual circuits. The following are some schematics I collected on the Internet for your reference.

1, parallel port interface (discrete components)

Applicable to Windows 95/98/Me operating system. This circuit has a 200K resistor compared with the circuit provided by the FMS. This is mainly for connecting to the JR remote controller. Because the JR remote controller trainer seems to be open collector design, you need to add one. The pull-up resistor works properly. However, the circuit is still very simple, and there are few components used. It is very suitable for friends who are not very radio-level, but it is a bit regrettable that it cannot be used on Win2000/XP.

2, serial interface (discrete components) string 5

Applicable to Windows 95/98/Me operating system, the circuit is not very complicated, of course, the components are more than the parallel port circuit, and the serial port shell is much smaller than the parallel port. How to put these components into a small shell inevitably requires everyone Think about it. Being small is also its biggest advantage, and it doesn't take up the computer's parallel port, because there are still some printers that still use the parallel port. The disadvantage is that it does not support Win2000/XP.

3, serial PIC interface (using PIC12C508 microcontroller) string 9

Applicable to Windows 95/98/Me/2000/XP operating system. The circuit is simple, just use MicroChip's PIC12C508 type MCU, and it is inevitable to use the programmer to write the program to the chip. This thing may not be a friend, but most of the places where the MCU is sold have a programmer. You just need to take a floppy disk. You need to use the HEX file to copy it and let the boss write it for you. The biggest advantage of this interface is the Win2000/XP operating system. You can also use the PPJOY software to play computer games with the remote controller virtual game controller.

4, 25-pin serial PIC interface (using PIC12C508 microcontroller)

Applicable to Windows 95/98/Me/2000/XP operating system. The circuit is basically the same as the 9-pin interface. It is only connected to the 25-pin serial port. It is not used much now.