Hi,
I'm trying to setup UPS monitoring in an RB750UP. It has had its firmare updated, and the package UPS.npk is installed. I am using version 6.23.
The USB port is not appearing :
[admin@MikroTik] /port> print
Flags: I - inactive
[admin@MikroTik] /port>
Any advice?
Regards
BTW, I can see the UPS (Riello IDR1200) connected to the usb port using the /system resource usb command
[admin@MikroTik] /system resource usb> print
0 1:1 Linux 3.3.5 ehci_hcd RB400 EHCI 480 Mbps
1 1:2 Cypress Semiconductor USB to Serial 1.5 Mbps
[admin@MikroTik] /system resource usb>
Try to add ups it is not need to seen in port if using usb ups.
Only APC ups are supported.
Here is picture from 750UP with APC Back-up 650 ups.
I have the same problem with the RBmAP2n, USB port isn’t in the port list, as a result I can’t add the UPS since there’s no port to select.
What ROS?
Version is 6.23 if you ask for ROS version. 
I have couple 750UP and also 411U and 433GL with working APC UPS usually use ACP Back-UPS 650 and some time Smart UPS 750 but Smart UPS connected using USB to serial port converter or serial port because give more information compare to USB connection (not tested in new version in older version 6.1x some status missing if connected to USB directly).
There is bug if using UBS to serial converter after RB reboot UPS is missing need to add it again.
Now I replacing UPS with power supply with ups function and in next couple months replace all UPS, longer work on battery, smaller.
If some one have question ask I have for now couple UPS connected to 411U 750UP 433GL some of then using USB to serial converter I can try it if someone need something to test 
on working system.
package UPS works only with APC? Or?
Reading documentation and forum UPS package only work with APC ups but all also some new models not working because change something in protocol.
Also can work if UPS emulate APC communication protocol.
OK. Thanks for all the answers. I’ll look for another backup power source