5-2
More Information
5-2
RS232C Command Table
Communication Format (Complies with the RS232C Standard)
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Baud rate : 9,600 bps
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parity : None
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Data bits : 8, stop bit : 1
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Flow Control : None
Serial Communication Protocol
1.
Command Packet Structure [7bytes]
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A command packet consists of 7 bytes in total.
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The two bytes 0x08 and 0x22 signify that the packet is for serial communication.
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The following 4 bytes represent a pre-defined command that can be defined by the user.
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The last byte is the checksum which checks the validity of the current packet.
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Header [2 Byte]: Pre-defined values fixed to 0x08 and 0x22.
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Cmd1 [1 Byte]: The first value of the code defined in the command list (Hexadecimal)
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Cmd2 [1 Byte]: The second value of the code defined in the command list (Hexadecimal)
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Cmd3 [1 Byte]: The third value of the code defined in the command list (Hexadecimal)
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Value [1 Byte]: Input parameter for the command (Default: 0) (Hexadecimal)
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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
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When the received packet from an external device has a valid value, a Success packet is sent. Otherwise, a Fail
packet is sent.
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A Fail packet is sent if:
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The received packet length is not equal to 7 bytes.
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The 2 byte packet header value is not equal to 0x08, 0x22.
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The check sum is incorrect.
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Failure detection by an external device
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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
