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SRP-X500P RS-232C Interface Manual
NAK : 0x4E ( ‘N’ )
When the SRP-X500P fails to process a command sent by an external computer, it returns a NAK to the
computer.
DELIMITER : 0x0D ( ‘CR’ )
The SRP-X500P adds a delimiter code (equivalent to the ASCII carriage return) as the last byte of all commands.
1.7 Communication Packet Format
Communication packets are variable in data length.
A communication packet consists of command, parameter and delimiter, as shown below.
Command example:
When “C” is selected in AV/RGB INPUT ( ‘C S E L 3 CR’ )
0x43, 0x53, 0x45, 0x4C, 0x33, 0x0D
Command Parameter Delimiter
Command : The command always comprises the first four bytes.
Parameter : The length and function of the parameter varies according to the command. See “2. Command
Reference” (page 6) for details.
Delimiter : The SRP-X500P always adds the delimiter code 0x0D (equivalent to the ASCII carriage return)
as the last byte of all commands.
Example of ACK
When the SRP-X500P returns the status of the AV/RGB INPUT SELECT ( response to ‘R S E L CR’)
0x41, 0x33, 0x0D
ACK Parameter Delimiter
Parameter : The length and function of the parameter varies according to the command. See “2. Command
Reference” (page6) for details.
Delimiter : The SRP-X500P always adds the delimiter code 0x0D (equivalent to the ASCII carriage return)
as the last byte of all commands.
Example of NAK
0x4E, 0x0D
NAK Delimiter
Delimiter : The SRP-X500P always adds the delimiter code 0x0D (equivalent to the ASCII carriage return)
as the last byte of all commands.
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