Approach Tech DVR-3024M - Manual (Page 55)

53
6. MISCELLANEOUS
6.1 RS-232 & RS-485 Setup & Protocol
6.1.1 RS232 & RS485 Setup
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.
Set the RS-232 option to ON in the COMMUNICATION page of the setup menu.
Set the PC communication parameters: 9600 bps, No Parity, 8 Data Bits, 1 Stop Bit.
6.1.2 Communication Protocol
6.1.2.0 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. MISCELLANEOUS