Rs-232 protocol – Approach Tech NVR-2018 User Manual
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6. RS-232 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 NVR to a
PC.
NVR
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
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(Low byte)>,
<Key Value(High byte)>,<0x4f>