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Thank you for your reply,
Yes, I2C was a first conclusion but; I haven’t used it before. I know that it uses s/w addressing instead of h/w. I need some explanation about the I2C protocol and an example will be great. :smile:
Regards.
Ok, I'm Back.
This is a 2 channel scope image, the yellow signal is from the Tip of the 2.5mm jack and the blue signal is from the middle (2.5mm Jack). The signals are recorded simultaneously after issuing a transmit command.
It seems that the type of serial communication is Synchronous...
An attempt to find the baud rate, I connected the scope to the tip of the 2.5mm jack and issue a transmit command for a selected data in the calculator memory. I repeated this action with the probe of the scope connected to the middle of the 2.5mm jack (I really don’t know which one i.e. tip...
As a start I measured the voltage levels of the transmitted signal from the 2.5mm jack. The levels where 0-2.7v, so to connect to PC using a MAX232 based circuits I needed a voltage level of 0-5V. Thus I constructed a simple level converter based on the LM339 comparator which was in my reach...
Hi,
The Casio fx-5800P programmable calculator can transfer its data to another fx-5800P calculator serially through 3-pin cable. See figure below.
It would be very useful if I can save data to the PC. To do so I have to understand the signal properties and the protocol that the Casio fx-5800P...
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