Casio Serial Cable

Casio Serial Cable Circuit

The Casio serial cable is a circuit, which interfaces the Casio “fx range” of calculators to the serial port of a computer PC. It was first tested and used with the Casio fx-7700Gbus calculator, which has the necessary data communication port.

If you have programmed your calculator with maths functions and you need to backup this data then a cable is useful for transferring the programs to the PC hard disk. Transferring and sharing programs is also a useful facility to have within a school environment.

Serial Communications

This circuit utilises minimum number of components, and built on a small piece of prototyping board. The design and build is simple so that a student may build it as an electronics project for school.

A MAX232CPE chip, which is a standard chip, used for serial communications converts the voltage levels between CMOS and TTL standards. This type of communication interface is very common with modern handheld gadgets.


Serial Ports

There are a huge number of programmable calculators on the market today, mainly by Texas Instruments and Casio, with a wide and differing array of communication ports. This circuit is only for those calculators capable of communicating over the serial port of a PC.

This circuit is for a Casio calculator with a three contact 2.5 mm jack plug that uses serial communications at TTL / CMOS levels. I have not tested this with every calculator, so you build this at your own risk. Do not use this circuit if your calculator has a different port.

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Casio Serial Cable
Casio Cable Circuit
Circuit Power & Serial Port Logic
Casio Cable Circuit Layout
MAX232 Basics for Students
Casio Serial Cable Components
2.5 mm Jack Plug Connection
Casio Serial Cable Circuit Build
Casio Serial Cable Test
Casio Serial Cable Compatibility
Casio Serial Cable Software Configuration