EverFocus EDSR100H Instruction Manual download pdf (Page 49)

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: 0x87 ==> this packets has 7 bytes length. ( not included Length byte itself )

2-3. Receiver ID

1). Individual receiver ID

---------------------------------------------------------------------

Decimal 14bit binary value Hbyte Lbyte Receiver ID (Digital Video Recorder)

------- ------------------- ------ ------ ----------------------

0 0000000 0000000 00 00 ID = 0

1 0000000 0000001 00 01 ID = 1

2 0000000 0000010 00 02 ID = 2

....

126 0000000 1111110 00 7e ID = 126

127 0000000 1111111 00 7f ID = 127

128 0000001 0000000 01 00 ID = 128

129 0000001 0000001 01 01 ID = 129

255 0000001 1111111 01 7f ID = 255

256 0000010 0000000 02 00 ID = 256

....

511 0000011 1111111 03 7f ID = 511

....

16382 1111111 1111110 7f 7e ID = 16382

---------------------------------------------------------------------

2). Broadcast ID

---------------------------------------------------------------------

Decimal 14bit binary value Hbyte Lbyte Receiver ID (Digital Video Recorder)

------- ------------------- ------ ------ ----------------------

16383 1111111 1111111 7f 7f all DVR connect to RS485

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EverFocus EDSR100H Instruction Manual Page 49