Difference between revisions of "CanServo/Protocol/V1.1"

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== MultiPacket for Long Message ==
== MultiPacket for Long Message ==


* Since this message is over 8 bytes in length, it is divided into multiple packets and delivered.
* The first step is to calculate the CRC16 of the message and add it to the end to create the content to be sent.
** Since the maximum data length of a CAN 2.0 packet is 8 bytes, 7 bytes are cut from the entire message, and information such as order is delivered as the last byte.
* Send (maximum) 7 bytes extracted from the content to be sent and a Check Byte.
** To verify Message delivery error, a 2-byte value calculated by CRC16 is added, and 7 bytes are cut and sent.


* Multi Packet's Data Format
* Multi Packet's Data Format

Revision as of 06:26, 11 June 2024

Under construction

CAN Protocol Ver 1.1

  • This protocol needs FW Ver 1.12+
  • Through this message, you can control the servo based on the UID of the servo.
  • Even if the ID1 and ID2 of the servo are 0, the register value of the servo can be changed.
  • CAN ID
    • 0x7FF : Servo -> Host
    • 0x7FE : Host -> Servo
  • Message : Servo -> Host
    • ZUID, <UID : 16 byte>, <ID2 : 4 byte>, <ID1 : 1 byte>, <CAN Mode : 1 byte>
  • Message: Host -> Servo
    • ZIDS, <UID : 16 byte>, <ID2 : 4 byte>
    • ZIDS, <UID : 16 byte>, <ID2 : 4 byte>, <ID1 : 1 byte>
    • ZIDS, <UID : 16 byte>, <ID2 : 4 byte>, <ID1 : 1 byte>, <CAN Mode : 1 byte>
  • This message is delivered using the MultiPacket method below.

MultiPacket for Long Message

  • The first step is to calculate the CRC16 of the message and add it to the end to create the content to be sent.
  • Send (maximum) 7 bytes extracted from the content to be sent and a Check Byte.
  • Multi Packet's Data Format
    • < Data : max 7 byte, cut from 'Message + CRC16' >, <Check Byte>
    • Check Byte
      • bit 7 = 1, if first packet
      • bit 6 = 1, if last packet
      • bit 5 = Toggle, first packet = 1, toggle bit on each packet
      • bit 4:0 = Seq, 0 ~ 31, inc 1 on each message
  • Note:
    • ID2, CRC16 : byte order : low byte first, little endian