Q: The ZHC4941’s 485 request is too fast, causing the device to not start properly, only the POW light is on ?
A: Modify the firmware; this is due to an unsuccessful upgrade. You need to select the previously upgraded firmware, open the correct port, click on local upgrade, and wait for it to automatically upgrade. After the upgrade is completed and displays success, after all settings are adjusted, power cycle the device, and hold down the reset button until the log shows data before releasing it.