On Jan 20, 2015, at 4:39 AM, Maurizio <[email protected]> wrote:
> Hi there, > I have a question about a raspberry pi as NUT server and a "relay". > I explain my situation: I have an UPS with USB port, so I connect it to > the rasp. The problem is that I have a device manageable only via USB > port. > How can I handle this configuration? > My assumptions are: > 1) split the USB cable from UPS to rasp and device, but I don't know if it > works As Manuel mentioned, you will need a USB hub. It will work better with an external power supply for the hub. However, if you don't already have a hub, you may want to consider a Raspberry Pi Model B or B+, with 2 or 4 ports, respectively. > 2) connect the UPS to rasp directly, so connect the rasp (by GPIO) to > device as a Serial port with a DIY cable. > > The problem with second solution is that I don't know if (and how) I can > do it with NUT. > I don't think anyone has tried connecting to the serial port on the RPi expansion header, but NUT should not have a problem (as long as the driver is not expecting flow control pins). However, the serial port is TTL levels, so you would need a TTL-to-RS-232 level shifter chip. The USB hub would be a lot simpler, IMHO. -- Charles Lepple clepple@gmail _______________________________________________ Nut-upsuser mailing list [email protected] http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsuser
