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Communications Protocol
[1] Communications Format
The communication unit is a 4 (min)-24 (max) byte
packet.
Communications Speed:
2400, 4800, 9600, 19200, 38400
38400 bps
・Data Length: 8 bit
・ Start Bit:
1 bit
・ Stop Bit:
1 bit
・ Parity: None
・ Flow Control: None
Packet Format
⁃
Message
Message
Header
0
1
Header
⁃
Format
1
0/1
0/1
Bit 7
Bit 6
Bit 5
(MSB)
・Bit 0-2: Fixed [0]
・Bit 3: Fixed [0]
・Bit 4: Fixed [0]
・Bit 5: Query commands [0], settings command [1]
・Bit 6: Settings/query [0], response to query [1]
Terminator Format
⁃
1
1
1
Bit 7
Bit 6
Bit 5
(MSB)
・Bit 0-7: Fixed [1]
Message Format
⁃
0
0/1
0/1
Bit 7
Bit 6
Bit 5
(MSB)
・ Bit 0-6:Refer to the various commands (0-127)
・Bit 7: Fixed [0]
Message
...
Checksum
2
0
0
0
0
Bit 4
Bit 3
Bit 2
Bit 1
1
1
1
1
Bit 4
Bit 3
Bit 2
Bit 1
0/1
0/1
0/1
0/1
Bit 4
Bit 3
Bit 2
Bit 1
Checksum Format
⁃
0
0/1
Bit 7
Bit 6
(MSB)
・Bit 0-6: Take the value which makes the sum of
・Bit 7: Fixed [0]
・Checksum:
A dd
up
v alues
f rom
t he
h eader
t o
t he
last
b it
just
b efore
the
Checksum,
and
take
t wo's
complement
and
assign
Bit7
a s
[
Response Command Format
⁃
Terminator
(0xFF)
1
Bit 7
Bit 6
(MSB)
0
・ Bit 0-3: ACK(Ah) / NACK(Bh) / ERR(Ch)
Bit 0
(LSB)
・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.
1
Bit 0
(LSB)
0/1
Bit 0
(LSB)
−7−
0/1
0/1
0/1
Bit 5
Bit 4
Bit 3
lower 7 bits from header to the checksum to
0.
1
1
1
0/1
Bit 5
Bit 4
Bit 3
0/1
0/1
0/1
Bit 2
Bit 1
Bit 0
(LSB)
0].
0/1
0/1
0/1
Bit 2
Bit 1
Bit 0
(LSB)
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