Datavideo DVD Recorder Datavideo HD HDD Recorder User Manual

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CMD-2:
Designates the exact command within the section specified by CMD-1.
DATA 0..15:
If the command requires extended data, the DATA COUNT will be set to between 1 and 15 (a 0 indicates
that no extra data is required). These bytes will be placed here.
CHECKSUM:
This byte is used to check the data for communication errors. To calculate the checksum, each byte of the
command (CMD-1+DATA COUNT, CMD-2, and any DATA BYTES) are added together. The least
significant 8 bits (1 byte) are then truncated to create a 1-byte checksum.
I.e.: The command “61.0C.03” becomes
MSB LSB
0110 0001 (=61)
0000 1100 (=0C)
+) 0000 0011
(=03)
0111 0001 (=70)
CHECKSUM = “70”
Therefore, the complete command is “61.0C.03.70”
3. Connector Pin Assignment
Interface: 9 pin D-Sub female
The RS-422 pin assignment of the Controller and HDR-40/50 is shown in the following table:
Signal
Pin
Controller HDR-40/50
1 Frame Ground Frame Ground
2 Receive A (RX-) Transmit A (TX-)
3 Transmit B (TX+) Receive B (RX+)
4 Transmit Common Receive Common
5 Spare Spare
6 Receive Common Transmit Common
7 Receive B (RX+) Transmit B (TX+)
8 Transmit A (TX-) Receive A (RX-)
9 Frame Ground Frame Ground
The RS-232 pin assignment of the Controller and HDR-40/50 is shown in the following table:
Signal
Pin
Controller HDR-40/50
1 - -
2 Receive (RX) Transmit (TX)
3 Transmit (TX) Receive (RX)
4 - -
5 GND GND
6 - -
7 - -
8 - -
9 - -

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