ASH 24/05/04
SRP-X351P
RS-232C Protocol Manual
1999 Sony Sound Tec. Corp
Sony SRP-X351P RS232C Protocol Manual
2
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 N.C.
2
TXD (Input to SRP-x300)
3
RXD (Output from SRP-x300)
4
Connected to 6 in SRP-x300
5 GND
6
Connected to 4 in SRP-x300
7
Connected to 8 in SRP-x300
8
Connected to 7 in SRP-x300
9 N.C.
Communication settings for RS-232C
The SRP-X351P uses the following communication settings:
Communication mode
:
half duplex mode (asynchronous)
Character length :
8bit
Parity
:
odd parity
Stop bit length :
1bit
Bit order
:
LSB first
Baud rate
:
9600bps
3 Provisions for communication
Acknowledge (ACK) , No Acknowledge (NAK)
When the SRP-X351P receives a defined command, it transmits ACK and when the
1 5
6 9
2 3 4
7 8
Sony SRP-X351P RS232C Protocol Manual
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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)
Sony SRP-X351P RS232C Protocol Manual
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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.
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