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| SRP-X351P RS-232C Protocol Manual 1999 Sony Sound Tec. Corp ASH 24/05/04 Sony SRP-X351P RS232C Protocol Manual 1 Outline This manual describes technical information necessary to control the SRP-X351P via the 9 pin RS-232C port. It is intended solely for users of the SRP-X351P. Hexadecimal numbers are shown in italics with an "H" suffix. Example: 18 (decimal) = 12H (hexadecimal) 2 Physical Connection The SRP-X351P uses a D-Sub9 male connector for communication via RS-232C. The pin assignments are shown below: 1 2 3 4 5 6 7 8 9 N.C. TXD (Input to SRP-x300) RXD (Output from SRP-x300) Connected to 6 in SRP-x300 GND Connected to 4 in SRP-x300 Connected to 8 in SRP-x300 Connected to 7 in SRP-x300 N.C. 1 2 3 4 5 6 7 8 9 Communication settings for RS-232C The SRP-X351P uses the following communication settings: Communication mode Character length Parity Stop bit length Bit order Baud rate 3 Provisions for communication Acknowledge (ACK) , No Acknowledge (NAK) When the SRP-X351P receives a defined command, it transmits ACK and when the : : : half duplex mode (asynchronous) 8bit : odd parity 1bit : LSB first : 9600bps 2 Sony SRP-X351P RS232C Protocol Manual SRP-X351P can not receive a command normally, it transmits NAK. Commands The controller should transmit a command after receiving ACK or NAK. Time out (1) When there is no response from the SRP-X351P after 100ms of sending a command, the controller should transmit the same command again. Time out (2) The controller should transmit a command within 500ms. When the controller transmits a command in more than 500ms, the SRP-X351P send back NAK with no handling a command. NAK When the controller receives NAK during transmitting a command, the controller should stop transmission of commands immediately. Handshake Communication is done by handshake. The Control line of the RS-232C must be used for communication. 4 Command List ACK (0AH) NAK (0BH) When the SRP-X351P can not receive a command normally, this command is sent with 1 byte variable describing the error: NAK (0BH) TIME OUT (02H) When the SRP-X351P can not receive DELIMITA (B1H) from the controller within 500ms receiving command, this command is sent. NAK (0BH) ERROR (04H) When there is communication error of RS-232C (Parity error, Framing error, Over run error), this command is sent. NAK (0BH) NOT FIND (05H) 3 Sony SRP-X351P RS232C Protocol Manual When the SRP-X351P receives an undefined command, this command is sent after receiving DELIMITA (B1H). ST3 Input Selection ST3 SELECT INPUT A (11H 80H 20H B1H) INPUT A of ST3 is selected. ST3 SELECT INPUT B (11H 80H 21H B1H) INPUT B of ST3 is selected. ST3 SELECT INPUT C (11H 80H 22H B1H) INPUT C of ST3 is selected. ST3 SELECT INPUT D (11H 80H 23H B1H) INPUT D of ST3 is selected. Output MUTE MUTE OFF (11H 81H 20H B1H) Muting function of the SRP-X351P is released. MUTE ON (11H 81H 21H B1H) Muting function of the SRP-X351P is active. Master Volume MASTER VOLUME DOWN (11H 82H 20H B1H) Master volume level is decreased. MASTER VOLUME UP (11H 82H 21H B1H) Master volume level is increased. MASTER VOLUME STOP (11H 82H 22H B1H) Master volume level remains in its position. 4 |
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