Today after the 40 Amp main breaker was triggered by power surge the mac mini crashed.
The GMC 500+ was as usual USB linked with the mac. Confirmed that baudrate is 115200.
After this event the GMC does not accept commands like <GETCFG>> or <GETDATETIME>> anymore but the link seems fine.
Checked with other MAC resulting in same problem.
Now I regret not having the mac on an UPS.
This seems correct situation when GMC500 is connected:
$ ls -l /dev/|grep usb
crw-rw-rw- 1 root wheel 21, 5 Jan 13 21:47 cu.wchusbserial620
crw-rw-rw- 1 root wheel 21, 4 Jan 13 21:45 tty.wchusbserial620
The call-up utility also reveals no problem but no communication possible after connected:
$ sudo cu -s 115200 -l /dev/cu.wchusbserial620
Connected.
cu: Got hangup signal
Pulling the USB plug results in the error message "cu: Got hangup signal".
Geigerlog finds the usb device but clearly reports that connection failed:
21:57:23.501 DEBUG : autoPORT: Failure - no communication at any baudrate on port: '/dev/cu.wchusbserial620'
21:57:44.128 DEBUG : serialOPEN: SerialException: ERROR: Connection failed using port='/dev/tty.wchusbserial640', baudrate=115200, timeout=1.0
21:57:44.128 DEBUG : ERROR: '[Errno 2] could not open port /dev/tty.wchusbserial640: [Errno 2] No such file or directory: '/dev/tty.wchusbserial640'' in file: 'gcommands.py' in line 1458
Someone in this forum has similar experience and can confirm that USB interface could be damaged by the MAC crash event?
I might end-up needing to use the audio output for digitising CPMs from now on :(
GMC 500+ no USB link after power failure
Posted - 01/13/2019 : 05:18:13
