View topic - Build your homemade casio calculator cable

by **Razumikhin** » Thu Aug 01, 2013 9:19 pm

Would it be possible to use a prebuilt rs232 to ttl converter as a casio cable? I assume all i would need extra is the 2.5mm jack.

http://www.ebay.co.uk/itm/RS232-To-TTL- ... 19ca595338

by **SimonLothar** » Fri Aug 02, 2013 9:08 am

Razumikhin wrote:Would it be possible to use a prebuilt rs232 to ttl converter as a casio cable? I assume all i would need extra is the 2.5mm jack.

http://www.ebay.co.uk/itm/RS232-To-TTL- ... 19ca595338

Active converter powered by some USB-port. TTL-RXD, TTL-TXD and GND ready to be distributed freely by some patch wires, which you have to connect to the 2.5mm only.
I'd say yes! This should save some soldering time.

by **ant** » Fri May 19, 2017 5:09 pm

Hmm. There is a possible danger that running it from a 5v USB port will mean the transmit will be at 5v not 3.3v as you want. It states power from 3.3v to 5v. Ask if output voltage is selectable. TTL volts can be different and incompatible.

by **ant** » Fri May 19, 2017 8:02 pm

You should be able to buy a 3 3v regulator module for about 50p. Just to be safe.

by **ant** » Sat May 20, 2017 5:16 pm

You put it between the USB and the unit. These things often run at the voltage they are supplied with.

View topic - Build your homemade casio calculator cable

Build your homemade casio calculator cable

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