Vivotek IP816A-LPC-v2 Installation Manual page 18

The parameters of IR illuminator can be controlled via the RS485 connection. You can
enable the connection in Configuration > PTZ > Mechanical window. Select the defaults
for the IR illuminator: Pelco D, baud rate - 38400, Data bits - 8, Stop bit - 1, Parity - none.
You can create custom buttons on a web console, such as IR brightness (Lux), threshold,
dimming, etc.
The IR control commands come in an 8 byte format. A sample command is shown below:
FF012101bf0005E7
FF01
FF01
Sync Addr
1111 1111 0000 0001
The format uses Hexadecimal 0-9, A-F. Each 8-bit byte contains two 4-bit hexadecimal
characters. Two hexadecimal characters contained in each 8-bit field of message.
2101
Cmd1 Data1
0010 00010000 0001 1011 1111 0000 0000 0000 0101 1110 0111
bit
31
Defaults for IR:
Pelco D
38400
8
1
none
Customizable IR control
bf00
Data2 Data3
18
05E7
Data4 Chks
bit
0