EverFocus EDR1640 - Remote Control Protocol

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15.2 Remote Control Protocol
A computer can be used to control the DVR by sending the packet as follows.
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EDR1640/1620/920 485 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)