[Nut-upsuser] Any ideas what protocol GE VH3000 UPS might talk?

[Phil Stracchino]

On 6/24/24 12:50, gene heskett via Nut-upsuser wrote:
> On 6/24/24 11:30, Jim Klimov via Nut-upsuser wrote:
>> Curiously, they identify as |067b:2303 Prolific Technology| like a
>> common USB-Serial dongle brand. Experiments with blazer and nutdrv-qx
>> got no reasonable response from the devices.
>>
>> Jim
>>
> The cure Jim, is eliminate the prolific by replacing it with a FTDI
> dongle.  Prolific has a bug in its wakeup, throwing away the first byte
> rx'd. I threw mine into the out bin 2 decades ago. Was trying to use it
> to talk to a cm11a for a heyu interface.  Failed miserably.  Encourage
> owners to toss it and get the FTDI-usb<->serial which Just Works.


THAT would explain a LOT of past issues with trying to use a Microsoft 
DeLorme GPS receiver as a stratum-1 time source.  Unfortunately since 
the Prolific chip was built into the device, replacing it with FTDI 
wasn't an option.  (The worse problem, though, was that at the time, the 
Prolific driver in the Linux kernel had a bug in it which prevented it 
from ever being unloaded once loaded, which in turn made it impossible 
to cleanly reboot.  I couldn't simply compile the driver inline because 
it didn't get initialized properly unless loaded as a module.)


-- 
   Phil Stracchino
   Fenian House Publishing
   phils at caerllewys.net
   phil at co.ordinate.org
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