1. Please check the hardware: RS485.
Step 1: RS485 A and B is reversed.
Step 2: Check RS485 cable continuity is OK or not.
2. Please check the software settings: keyboard controller and speed dome address, protocol, and baud rate.
Step 1: Press [ Search ] to check the current protocol and baud rate is correct or not.
Step 2: Restore the settings to the default setting and reset.
