Pronto has a serial port for the communication with a computer. This port works at 115200 baud, 8N1. The communication is pretty simple:

First: get attention of the Pronto. This is done by sending an ACK (0x06) to the Pronto. The Pronto should send a '!' (standby mode) or a '*' (awaiting data, done by holding the left and right key down, while the serial cable was plugged in). If the Pronto don't respond, try again until timeout.

When the Pronto awaits a command, you can send strings (terminated with CR (0x0D)) like:

irlearn 3500

The Pronto now awaits an infra red signal to learn. The result is send via YModem CRC protocol.

q ccf

Inquiry. The Pronto sends a string containing 4 decimal numbers. The first is the dirty flag (CCF data in the Pronto changed by the user and is not uploaded to the computer yet), the second is the size of the CCF file, the third the the date (in a 8 digit decimal BCD format), the fourth is the time (in a 6 digit decimal BCD format) of the last change of the CCF file.

ul ccf

Uploading a CCF file from the Pronto to the computer. The CCF file is simply send via YModem CRC protocol to the computer.

dl ccf

Downloading a CCF file to the Pronto from the computer. The CCF file is simply send via YModem CRC protocol to the Pronto.

reboot

Reboot the Pronto.