EverFocus EDR410M, EDR810H, EDR410H, EDR810M instruction manual Remote Control Protocol

15.2 Remote Control Protocol

A computer can be used to control the DVR by sending the packet as follows.

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485/232 Control Code Protocol

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1-1. Sample control code packets

Example1: A packet that send "REC" key to EDR(ID=5)

0x85	(length)
0x00	(Receiver ID high byte)
0x05	(Receiver ID low byte)
0x4B	(OPcode = key)
0x08	(DATA1 = "Rec" keycode)
0x5D	(checksum)

Example2: A packet that send "PAUSE" key to EDR(ID=4999)

0x85	(length)
0x27	(Receiver ID high byte)
0x07	(Receiver ID low byte)
0x4B	(OPcode = key )
0x0C (DATA1 = "Pause" keycode )
0x0A	(checksum)

Example3: A packet that send "PLAY" key to all EDR(broadcast)

0x85 (length)

0x7f (Receiver ID high byte) 0x7f (Receiver ID low byte) 0x4B (OPcode = key )

0x0B (DATA1 = "Play" keycode ) 0x59 (checksum)

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 packet has 7 bytes length. (not included Length byte itself)

2-3. Receiver ID

1). Individual receiver ID

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Decimal 14bit binary value		Hbyte		Lbyte Receiver ID
-------	------------------- ------ -----		-----------
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