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 2.GQ Geiger Muller Counter
 GMC 500+ no USB link after power failure

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T O P I C    R E V I E W
donghelan Posted - 01/13/2019 : 05:18:13

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 :(

6   L A T E S T    R E P L I E S    (Newest First)
EmfDev Posted - 01/28/2019 : 10:00:09
Hmm, that's weird, is there anything interfering with the connection when it's ON?
donghelan Posted - 01/28/2019 : 06:56:48
The actual solution appears to be:
Switch the Counter off.
Detect the USB device port it is hanging on and fire commands to it at the desired 115200 bps speed (such as <POWERON>>).
EmfDev Posted - 01/22/2019 : 09:55:17
That's great!
donghelan Posted - 01/20/2019 : 06:00:26
Mac Mini and Geigercounter were unpowered for a week. Put everything on again today and to my happy surprise the usb link appears normal again!
Must have been some bad bits somewhere ;)
EmfDev Posted - 01/14/2019 : 15:25:16
It's hard to say. Try to factory reset first.
donghelan Posted - 01/13/2019 : 05:27:22
I can still try the wifi interface.

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