GSM/LTE modules require significant current bursts during network registration or transmission (often up to 2A for short bursts).
If baud rates match, the error suggests a software logic issue. handshaking... error unexpected response 0x68
The 0x68 error rarely indicates a hardware apocalypse. Instead, it points to a mismatch of expectations. Here are the five most common scenarios. If baud rates match, the error suggests a
If possible, try establishing the connection using a different tool or client. This can help determine if the issue is specific to one client or if it's a more widespread problem. If baud rates match
Symptom: Intermittent handshake error 0x68 on a CNC machine’s RS-422 link.
Analysis: Logic analyzer showed massive spikes on the RX line every time the spindle motor turned on. The machine’s ground was floating.
Fix: Added a dedicated ground wire between controller and CNC. The 0x68 error disappeared because the reference voltage stabilized.