Casio CTK-691 Midi Implementation Manual

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Casio CTK-691 Midi Implementation Manual Manual pdf 35 page image

3517.2.10 10...index Parameter Index NumberThis field contains a supplementary number that points to data when parameters are arrayed. This means that eachparameter has a different number, and the length of the number is anywhere from one to four bytes.Even when parameters have the same IDs, for example, the parameters also have preset numbers, part numbers,and key numbers, and so the parameters can be distinguished by specifying these values with an "index".In this case, "index" is a 3-byte fixed field. When transferring one parameter set, it indicates the divided packetserial number (starting with 00) and the size of the "data" field that immediately follows this field.i[0]...0nnnnnnnB Packet Number LSB (NNNNNNNnnnnnnnB = Packet Number)i[1]...0NNNNNNNB Packet Number MSBAs detailed in the "data" field explanation, up to 128 bytes of data can be send in one packet. When sending datain excess of 128 bytes, it is divided into 128-byte packets (final packet can be less than 128 bytes), and receiveddata is stored at the address equivalent to:ParameterSet Start Address + PacketNumber × 128i[2]...0LLLLLLLB data length / 3The data length is the data length indicated here, multiplied by 3. This means that the data length is always amultiple of 3.This field is always empty.In this case, the "index" field length is fixed at 1 byte, and it indicates the control messages used for handshakingas shown below. See "19 Parameter Set Transfer Modes" for more information.When act = 00(IPC) or 01(IPR)Format: 0iiiiiiiB (0jjjjjjjB) (0kkkkkkkB) (0lllllllB)When act = 02(BDS) or 04(HDS)Format: 0nnnnnnnB 0NNNNNNNB 0LLLLLLLBWhen act = 03(BDR) or 05(HDR)Format: -When act = 7 (EOD, HDA, HDJ, HDE, BSY, NOP)Format: 0000ccccB