Datavideo DVD Recorder Datavideo HD HDD Recorder User Manual

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4. Communication Protocol
1. All communications between the CONTROLLER and the DEVICE will be under the direct
supervision of the CONTROLLER.
When the DEVICE (HDR-40/50) receives the COMMAND from CONTROLLER, the following
COMMAND is returned.
ACK: In case that the DEVICE receives a COMMAND not requiring data
COMMAND+DATA: In case that the DEVICE receives a COMMAND requiring data
NAK+ERROR DATA: In case that a communication error is detected or an undefined
COMMAND is received
2. The CONTROLLER must not transmit additional COMMAND blocks to a DEVICE (HDR-40/50) prior
to response to a previous COMMAND block.
3. The CONTROLLER must transmit of bytes in a COMMAND block for with intervals less than 10
milliseconds. If a DEVICE (HDR-40/50) detects an interruption of a byte in a COMMAND block that
exceeds 10 milliseconds, it executes a TIME-OUT error sequence, voids the receiving COMMAND
block, and transmit a NAK (TIME OUT).
4. When a DEVICE (HDR-40/50) receives a COMMAND block from the CONTROLLER, the DEVICE
must transmit a response within 9 milliseconds. Therefore if the CONTROLLER cannot receive the
appropriate response from the DEVICE within 10 milliseconds after transmitting the COMMAND
block the CONTROLLER detects a communication error, and must execute an appropriate process.
5. When a DEVICE (HDR-40/50) detects a communication error, it must immediately transmit a NAK to
the CONTROLLER. (The content of an error is shown on the COMMAND tables.) When the
CONTROLLER receives a NAK, if must immediately stop transmission of the block. The DEVICE
must not accept a subsequent command within 10 milliseconds after that (except NAK-UNDEFINED
command) and must execute a necessary process.
5. Command Table (without Checksum byte)
Command Name Response Name
10h 01h Acknowledge (ACK) – command succeeded
12h 11h Device Return
11h 12h Negative Acknowledge (NAK) – command failed
00h 11h Device Type Request 12h 11h Device Type Response
20h 00h Stop 10h 01h ACK
20h 01h Play 10h 01h ACK
20h 02h Record 10h 01h ACK
20h 10h Fast Forward 10h 01h ACK
2xh 13h Shuttle Forward 10h 01h ACK
21h 13h 00h Pause 10h 01h ACK
20h 20h Fast Rewind 10h 01h ACK
2xh 23h Shuttle Rewind 10h 01h ACK
40h 50h Next Track 10h 01h ACK
40h 51h Previous Track 10h 01h ACK
41h 52h nnh Select Track 10h 01h ACK
41h 53h nnh Select Video Input Source 10h 01h ACK
41h 61h nnh Select Audio Input Source 10h 01h ACK
40h 62h Enable HDD mode 10h 01h ACK
61h 0Ch 01h Current Time Sense 74h 04h Current Time

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