Canon SX 50 - Manual (Page 13)

Projector User Commands
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3. Communication Flow
Transmission sent
At the sending side (PC), the transmission is sent within character intervals of Tc (character interval timeout).
Transmission received
At the receiving side (Projector), data able to be received within the character interval of Tc is held, and receiving of
a delimiter is considered “transmission received”.
If a received character interval exceeds Tc or a delimiter is not received within 256 characters, all data already
received is lost, and the mode is reset to receive standby again.
Command/Response
One response is always returned for each command sent from the PC. (However, note that a response may not be
returned when the internal receive buffer overflows due to reception of a large amount of data.)
PC Projector
Commands
WithinTr
Response
* The timeout interval between command and response (Tr) is 10 seconds.
Response Reception Timeout
If a response is not received within Tr (timeout interval between command and response) while in response
reception standby after sending a command at the PC, resend the command in the “response reception timeout”.