Datavideo DVD Recorder Datavideo HD HDD Recorder User Manual

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HDR-40 HDR-50 RS-422 Protocol Reference V1.0
1. Interface Overview
Conforming to EIA RS-422A.
Full duplex communications channel is utilized.
Data is transmitted asynchronously, bit serial, word serial with data exchange between devices.
Standard transmission rate on the interface bus is 38400 bits per seconds (bps)
The data word utilized by the interface system is as follows :
1 Start bit + 8 Data bits + 1 Parity bit + 1 Stop bit. Odd Parity
ODD parity: The total of “1”s in D0+D1+ . . . D7+PARITY equals an odd number.
2. Command Block Format
The data communication is composed of the CMD-1/DATA COUNT byte, the CMD-2 byte, optional DATA
bytes and the CHECKSUM byte. Commands are transmitted in order from the MSB (Most Significant Byte)
to the LSB (Least Significant Byte). This means that when using the examples in this manual, the order in
which the bytes are read is the same order in which they are transmitted. When the DATA COUNT nibble is
0, no DATA bytes are transmitted or required (the CMD-1/DATA COUNT byte, CMD-2 byte and CHECKSUM
byte are still transmitted). When the DATA COUNT nibble is not 0, the number of DATA bytes transmitted
must correspond with the DATA COUNT. These bytes are inserted between the CMD-2 byte and
CHECKSUM byte.
COMMAND BLOCK FORMAT
The data communication between the controller and the device is performed as follows:
Name
CMD-1 Data Count CMD-2 Data 0~15
(per Data Count)
Checksum
Nibble MSN LSN
Size 1 Byte 1 Byte 0..15 Byte(s) 1 Byte
1. MSN stands for Most Significant Nibble (4 bits)
2. LSN stands for Least Significant Nibble (4 bits)
COMMAND CONTENTS
CMD-1:
This is the first (Most Significant) nibble of the first byte of the command. The DATA COUNT (below)
fills the lower (Least Significant) nibble. It indicates the command or return group to which the command
belongs as per the table below
CMD-1 Function Initiator
0x System Control Controller
1x System Control Return Device (HDR UNIT)
2x Transport Control Controller
4x Preset And Select Control Controller
6x Sense Request Controller
7x Sense Return Device (HDR UNIT)
Ex DVR Control Controller
Fx DVR Return Device (HDR UNIT)
DATA COUNT:
This is the second (Least Significant) nibble of the first byte of the command. The upper (Most Significant)
nibble is filled by the CMD-1 (above). It indicates the number of data bytes (0-15) that are required to be
inserted between the CMD-2 byte and the CHECKSUM byte.
D0 D1 D2 D3 D4 D5 D6 D7
PARITY
(ODD)
START
BIT
STOP
BIT

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