Serial remote control function
D&M RC Communication format (RC)
n Configuration of control commands
The packets of control commands start with the Start Character “@”,
and end with the End Character “0x0D” as shown below.
COMMAND
ID
0
Start
Character
End
Character
\r (0x0D)
@
n Configuration of command codes
Item Value (Hex value within parentheses)
Start Character ‘@’ (0x40)
ID ‘0’ (0x30)
Command Indicates the command details.
End Character ‘¥r’ (0x0D)
Response timeout is 100msec.
n ACK (received successfully) and NACK (receive
failed) command codes
Content
Hex
value
Transmission conditions
ACK 0x06 –
NACK 0x15 • When an End Character (0x0D) is received
with no Start Character “@”
• When a command that does not exist is
received
• When there is a space more than 5msec
between command characters
• When a command is received, ACK or NACK is returned within 100
msec.
• If there is no response after 100 msec, the next command is
permitted.
q External control and operation of the DN-501C
When the DN-501C receives a control command from the host, the
DN-501C sends ACK (received successfully) to the host and executes
the command.
Control command
ACK
DN-501C
Host device
However, if data other than a specified command or an End Character
(0x0D) with no Start Character ‘@’ is received, receive fails and NACK
is returned.
w Status information output for external status
request commands
When a status request is received from the host, the DN-501C returns
ACK and a response to the request details.
ACK
DN-501C
Status request
command
Sequence diagram of status request command
Status information
command
Host device
However, if data other than a specified command or an End Character
(0x0D) with no Start Character (‘@’) is received, receive fails and NACK
is returned.
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