Sony SRP-X500P - Manual (Page 4)

SRP-X500P RS-232C Interface Manual
1.3 Communication Format
The communication format is described below.
Baud rate
: 38,400 bps
Communication mode : Half-duplex start stop system (asynchronous)
Data length : 8 bits
Parity bit : odd
Stop bit : 1 bit
Flow control : None
1.4 Communication Protocol
The communication protocol is described below.
・When the SRP-X500P successfully receives a command from the computer, the SRP-X500P returns an ACK
(Acknowledge). When the SRP-X500P fails to process a command due to a reception error or other problem, it
returns a NAK (Not Acknowledge).
・When the computer sends a command, the computer waits for an ACK or NAK from the SRP-X500P. If the
computer receives a response, it can send the next command.
・If the computer does not receive a response even after 1000 ms has elapsed after the transmission of the
command, it means that the SRP-X500P did not receive the command normally. The computer should re-send the
command.
・Transmission of the command by the computer should take place within 1000 ms. If the transmission is not
completed within 1000 ms, a NAK should be returned without processing of the command.
・If the computer receives a NAK while transmitting the command, the computer should stop transmitting the
command immediately.
1.5 RS-232C indicator
When SRP-X500P is communicating with the computer, the RS-232C indicator on the front panel is lit up.
1.6 Note on Value Settings
When setting up or operating the SRP-X500P through the RS-232C connector, be sure the parameters are within
the value ranges specified in this protocol manual. The setting of values not defined in this manual may be a
cause of an operational malfunction in the SRP-X500P or a communication malfunction between the SRP-X500P
and the SRP-X500P Manager software. If this happens, the FACTORY PRESET command should be transmitted
to restore the SRP-X500P parameters to their factory settings.
Afterwards, the parameters should be set to their appropriate values.
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