Sanyo VCC-MD600P, VCC-MD400P, VCC-MD500, VCC-MD300 Communications Protocol, Communications Format

Communications Protocol

[1] Communications Format

The communication unit is a 4 (min)-24 (max) byte packet.

・Communications Speed:

2400, 4800, 9600, 19200, 38400 9600 bps

(DEFAULT MD800 – 500)

*MD400 and MD300 cannot connect at 38400bps.

	DEFAULT is 19200bps.
・Data Length:			8 bit
・Start Bit:			1 bit
・Stop Bit:			1 bit
・Parity:None
・Flow Control: None
⁃⁃Packet Format
	Header	Message	Message	Message			…	Checksum		Terminator
		0	1		2						(0xFF)
⁃⁃Header Format
	1	0/1	0/1	0		0	0		0		0
	Bit 7	Bit 6	Bit 5 Bit 4			Bit 3	Bit 2		Bit 1		Bit 0
	(MSB)										(LSB)

・Bit 0-2: Fixed [0] *Reserved bit: Camera address (0-7)

・Bit 3: Fixed [0] *Reserved bit: During broadcast transmissions

・Bit 4: Fixed [0]

・Bit 5: During query commands [0], during settings command [1]

・Bit 6: During settings/query [0], during response to query [1]

⁃⁃Terminator Format

	1	1	1	1	1	1	1	1
	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
	(MSB)							(LSB)
・Bit 0-7: Fixed [1]
⁃⁃Message Format
	0	0/1	0/1	0/1	0/1	0/1	0/1	0/1
	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
	(MSB)							(LSB)

・Bit 0-6:Refer to the various commands (0-127)・Bit 7: Fixed [0]

⁃⁃Checksum Format

0	0/1	0/1	0/1	0/1	0/1	0/1	0/1
Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
(MSB)							(LSB)

・Bit 0-6: Take the value that sets the lower 7 bits of the values added from the header to the checksum to 0.

・Bit 7: Fixed [0]

⁃⁃Response Command Format

1	1	1	1	0/1	0/1	0/1	0/1
Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
(MSB)							(LSB)

・Bit 0-3: ACK(Ah) / NACK(Bh) / ERR(Ch)

・Bit 4-7: Fixed [1]

・ACK: This is the response when the process of the received command is correctly completed after receiving the data in the correct format.

・NACK: This is the response when data is received in an incorrect format.

・ERR: Although the data is received in the correct format, this is the response when the process regarding the received command is incorrect or cannot be conducted.

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