Samsung SP-A600B User Manual (user Manual) (ver.1.0) (English) - Page 35
RS-232C Command Table, Communication Format Complies with the RS232C Standard
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5-2 RS-232C Command Table Communication Format (Complies with the RS232C Standard) • Baud rate : 9,600 bps • parity : None • Data bits : 8, stop bit : 1 • Flow Control : None Serial Communication Protocol 1. Command Packet Structure [7bytes] 0x08 0x22 cmd1 cmd2 cmd3 value CS • A command packet consists of 7 bytes in total. • The two bytes 0x08 and 0x22 signify that the packet is for serial communication. • The following 4 bytes represent a pre-defined command that can be defined by the user. • The last byte is the checksum which checks the validity of the current packet. • Header [2 Byte]: Pre-defined values fixed to 0x08 and 0x22. • Cmd1 [1 Byte]: The first value of the code defined in the command list (Hexadecimal) • Cmd2 [1 Byte]: The second value of the code defined in the command list (Hexadecimal) • Cmd3 [1 Byte]: The third value of the code defined in the command list (Hexadecimal) • Value [1 Byte]: Input parameter for the command (Default: 0) (Hexadecimal) • CS [1 Byte]: Checksum (the 2's complement of the sum of all the values except for the CS value.) 2. Response Packet Structure [3 Bytes] 1. Success 0x03 2. Fail 0x0C 0xF1 0x03 0x0C 0xFF • When the received packet from an external device has a valid value, a Success packet is sent. Otherwise, a Fail packet is sent. • A Fail packet is sent if: •The received packet length is not equal to 7 bytes. •The 2 byte packet header value is not equal to 0x08, 0x22. •The check sum is incorrect. • Failure detection by an external device •An external device classifies the packet as Fail if it does not receive a Success packet within 100ms. • Transmit the following control command to transmit one or more control commands if there was a successful response for the previous transmission or there was no response in over 3 seconds. • While controlling the Projector using a Computer, you cannot check the Projector' s status change using the Computer nor will it be displayed on the Projector's screen. Transmit the INFORMATION command to display the current information on the Projector's screen. • All the control commands apply to the input source and the Projector's status currently displayed. More Information 5-2