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SCHNITTSTELLEN - SPEZIFIKATIONEN
2-1. The format of message packet is as follows:
Length Byte (Prefix: 0x86, 0x87, or 0x88 ..... )
Receiver ID high byte
Receiver ID low byte
Opcode Byte
Data Byte1
Data Byte2
Data Byte3
.
.
Checksum Byte
2-2. Length Byte
This Length Byte is also a prefix. Bit7 must be 1.
EX:
2-3. Receiver ID
1). Individual receiver ID
---------------------------------------------------------------------
Decimal
-------
0
1
2
....
126
127
128
129
255
256
....
511
....
16382
---------------------------------------------------------------------
2). Broadcast ID
---------------------------------------------------------------------
Decimal
-------
16383
---------------------------------------------------------------------
0x87 ==> this packets has 7 bytes length. ( not included Length byte itself )
14bit binary value
------------------- ------
0000000 0000000
0000000 0000001
0000000 0000010
0000000 1111110
0000000 1111111
0000001 0000000
0000001 0000001
0000001 1111111
0000010 0000000
0000011 1111111
1111111 1111110
14bit binary value
------------------- ------
1111111 1111111
43
Hbyte Lbyte
------ ----------------------
00
00
00
01
00
02
00
7e
00
7f
01
00
01
01
01
7f
02
00
03
7f
7f
7e
Hbyte
Lbyte
Receiver ID (Digital Video Recorder)
------ ----------------------
7f
7f
all DVR connect to RS485
Receiver ID
(Digital Video Recorder)
ID = 0
ID = 1
ID = 2
ID = 126
ID = 127
ID = 128
ID = 129
ID = 255
ID = 256
ID = 511
ID = 16382
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