Samsung L335 Especificações descarregar pdf (Página 78)

More Information 6-2

6-2 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]

• 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) (Decimal)

• 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

2. Fail

• 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.

0x08 0x22 cmd1 cmd2 cmd3 value CS

0x03 0x0C 0xF1

0x03 0x0C 0xFF

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 88 89

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