Sanyo VCC-MD500 ユーザーズマニュアル

− 6 −

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

⁃

Header Message

0

Message

1

Message

2

…

Checksum Terminator

(0xFF)

⁃

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 0

(LSB)

Bit 1

1

0/1

0/1

0

0

0

0

0

・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]

⁃

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 0

(LSB)

Bit 1

1

1

1

1

1

1

1

1

・Bit 0-7: Fixed [1]

⁃

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 0

(LSB)

Bit 1

0

0/1

0/1

0/1

0/1

0/1

0/1

0/1

・Bit 0-6:Refer to the various commands (0-127)

・

Bit 7: Fixed [0]

⁃

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 0

(LSB)

Bit 1

0

0/1

0/1

0/1

0/1

0/1

0/1

0/1

・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]

⁃

Bit 7

(MSB)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 0

(LSB)

Bit 1

1

1

1

1

0/1

0/1

0/1

0/1

・

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.