Using Rs-232 With Dvr-n Series

Many people have had questions about making RS-232 work on Channel Vision DVR-N series. So, this is how to make RS-232 work on the DVR-4, 8, and 16N.

With the RS-232 commands for the DVR, the DVR ID does not matter.

1.) You cannot use HyperTerminal to send commands, because you cannot send hex commands with HyperTerminal

Sample string for status of the DVR-4, DVR-8, and DVR-16N is as follows:
0x80, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0xEB, 0x01, 0x7D, 0x5D, 0x00, 0x00, 0x0D, 0x0AA

We at Channel Vision use COM port toolkit 3.5. to test.

2.) Even though the serial command list said to change the DVR-ID we did not. Any ID will work with any DVR.

3.) You MUST use a crossover RS-232 cable.

4.) We used 9600 and 115200 as a baud rate. (Others work as well)

I used the following exact string for a DVR-4N (status)

0x80, 0x01, 0x00, 0x00, 0x00, 0x05, 0x00, 0xEB, 0x01, 0x7D, 0x5D, 0x00, 0x00, 0x0D, 0x0A

The DVR does not send back status however, it makes the DVR video output go to the status screen.

The cable I am using is a crossover on one side, which switches send and receive only.

I did not try 0x08 as the ID, I am using a DVR-4N
Try 0x05 (though the controller doesn't care what the ID is)

By: Channelvision

Article Directory: http://www.articledashboard.com