Problem reading Pan position from PTZ camera using Pelco-d with RS-485

alvise123

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I have Hikvision PTZ camera.
-PTZ camera only has 2 pin RS-485 input (half-duplex)
-I am using 232Analyzer app to test.
-The converter I use is UT-890A RS-485 to USB.

I am trying to read the location information of the PTZ camera from the computer.
I can control PTZ using RS-485 via pelco-d. It acts on the information I sent.
I am trying to read pan current position information but I am not getting any turn information. Does anyone know the cause of this problem?
Can anyone help with this?


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Securame

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That will not work.

RS485 bus is used for commands (PTZ movement, zoom, OSD menus, whatever), and it is an unidirectional bus. You send commands over that bus, and expect whatever devices receive those commands to accordingly.
"Hey, ID1 device, go to this coordinates"
"Hey, ID2 device, zoom in"
Etc.

But the cameras ill not reply over the RS485 bus. They will move, zoom, or whatever you tell them to do if the commands apply to them, but they will not even let you know that they have received/acted on that command.
 
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