4
Communication Protocol
Types of Serial Communication
Three types of serial communication can be transmitted between the host and DN-500R:
1.
Control commands sent to DN-500R from the
host
You can use control commands to make DN-500R
perform a desired function (such as initiating a
recording or playing a track).
When DN-500R receives a control command from
the host, DN-500R sends an ACK signal to the
host and then executes the command.
2.
Status request commands sent to DN-500R
from the host
You can use a status request command to
determine the current state of one of DN-500R’s
components (such as the amount of free space left
on the media source or the currently selected
recording input).
When DN-500R receives a status request
command from the host, DN-500R answers the
host with an ACK signal followed by the requested
status information.
3.
Status information automatically sent to the
host when a change is made from DN-500R
When certain changes to DN-500R are made from
the device itself, DN-500R automatically sends
status information to the host. When the host
receives automatic status information successfully,
it sends an ACK signal to DN-500R.
DN-500R Host
Control
Command
DN-500R Host
DN-500R Host
Status
Request
Command
Status
Information
Status
Information
