Maxtor NVR-2028 manual Setup, Communication Protocol, General Command Format

APPENDIX 2. –RS-232 Protocol

1.Setup

1.1Use 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-2028 to a PC.

NVR

1.2Set the RS-232option to ON in the COMMUNICATION page of the setup menu.

1.3Set the PC communication parameters: 9600 bps, No Parity, 8 Data Bits, 1 Stop Bit.

2.Communication Protocol

2.1General 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: 2.2 Keys and signals

PC Send: <0x41>, <0x01>, <0x20>, <0x01>, <Key Value(Low byte)>, <Key Value(High byte)>,<0x4f>

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