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6. RS-232 & RS-485 Protocol
6.1 Setup
6.1.1
Use a Null Modem cable (the standard RS-232 9 Pin Cable with Pin 2 and Pin 3 exchanged, see pin
configuration chart below for details) to connect the COM 1 on the rear panel of the DVR to a PC.
6.1.2
Set the
RS-232
option to
ON
in the
COMMUNICATION
page of the setup menu.
6.1.3
Set the PC communication parameters: 9600 bps, No Parity, 8 Data Bits, 1 Stop Bit.
6.2 Communication Protocol
6.2.0 General Command Format
<Lead Code = 0x41>, < Dest ID >, < Src ID >, <Main category >, <Second category >, {<Number of
parameters>, <Parameter 1>, <Parameter 2> ..,} <End Code= 0x4f>
Lead Code = 0x41
Dest ID = 0x01
Src ID = 0x20
Main Category = 0x01
Keys and Signals
= 0x02 Command
Second Category = 0x01 Handshake
= 0x02 Request Time/Set Time
=
0x06
Request
System
State
=
0x0b
Time
Search
=
0x10
Request
HDD
Info
=
0x11
Request
REC
Position
=
0x12
Playback
Immediately
End Code= 0x4f
The different command types and their corresponding parameters are as follows:
6.2.1 Keys and signals
PC Send: <0x41>, <0x01>, <0x20>, <0x01>, <Key Value>, <0x4f>
