The Mysterious JKD-512COM User Manual
| Problem | Possible Cause | Solution | |------------------------|------------------------------------|----------------------------------| | No power (PWR off) | Power supply unplugged / wrong voltage | Check connections, replace adapter | | No data transmission | Baud rate mismatch | Match settings on both devices | | ERR LED on | CRC error / timeout | Reset device, check cabling | | Intermittent connection| Loose connector or interference | Secure connectors, use shielded cable | jkd-512com user manual
Reset procedure: Press and hold the Reset button for 5 seconds until all LEDs flash twice. The Mysterious JKD-512COM User Manual 7
4. Installation