[Nut-upsuser] howto setup BNT-1500AP on gentoo

[Arjen de Korte]

>> data receiving error (-1 instead of 16 bytes)

[...]

> The logfile '/tmp/powercom.log' will help narrow down which code path
> is returning '-1'.

Looking at the sources, it is quite obvious where this error occurs (in
upsdrv_updateinfo). Sending a command to the UPS apparently is not a
problem, but the '-1' indicates that the UPS is not responding at all
(most likely, ser_get_buf_len times out). I agree with Charles' remark to
checkout the cable.

Regards, Arjen
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