Is the external interface port of the Casio digital diary a standard RS232 serial interface?
The external interface port on the side of the Digital Diary is almost a standard serial interface, with the following differences: • Only 3 leads are implemented: send, receive, and ground – not a major limitation, since this is all you need for local serial communications • The physical format is a 3-contact 2.5mm mini-jack rather than a standard 9 or 23-pin D jack in order to keep the size down • It operates at 6 volts instead of the 7.5+ volts required for RS232, and therefore requires a voltage step-up to interface to any external RS232 port (this is why you need a special cable or adapter) Note: The SF-5x90SY and SF-6x00SY use a different cable with a larger 3.5mm plug at the diary end. These cables operate at 12 volts, and are NOT compatible with the older cables or diaries. WARNING: Don’t try to connect your Digital Diary directly to a serial port without the proper adapter, or you’ll probably burn out the Diary interface!
