What is the reason for not being able to control the decoder?

What is the reason for not being able to control the decoder?

1. Check if the decoder is powered.

2. Check if the code converter has pulled out the output 485 signal.

3. Check if the decoder protocol is set correctly.

4. Check if the baud rate setting matches the decoder (check if the address code setting is consistent with the selected camera (see the decoder manual for the detailed address code drawing table)

5. Check if the wiring of the decoder and the code converter is wrong (1-485a, 2-b; some decoders are 1-485b, 2-a)

6. Check if the decoder works normally (you can press the decoder self-test switch to see if the decoder action is up, down, left or right, auto, aperture, zoom, focus action; when the software controls the pan/tilt, the decoder Up, down, auto and other ports and ptcom port will have voltage changes, the change depends on the decoder depending on the decoder 24vor220v, the decoder port will also have switching signal changes, such as auxiliary switches AUX1, AUX2), if any, decode The device works normally, otherwise it is a decoder failure.