How to monitor multiple USB UPS with Network UPS Tools

I'm currently running NUT on my RaspberryPi (using Raspbian ), I have managed to connect my Mecer USB UPS to NUT using the blazer_USB driver. Recently I got another UPS (same model) and would like to connect it to the same Pi via USB. The second UPS is connected and configured but the Pi only reads one UPS. When both UPS are connected it reads UPS2; if i remove the USB cable of UPS2 it then reads UPS1. /etc/nut/ups.conf [upswifi] driver = blazer_usb port = /dev/usb desc = "Dearx_UPS_WIFI_1" [upslan] driver = blazer_usb port = /dev/usb desc = "Dearx_UPS_LAN" LSUSB output Bus 001 Device 009: ID 0665:5161 Cypress Semiconductor USB to Serial Bus 001 Device 008: ID 0665:5161 Cypress Semiconductor USB to Serial Bus 001 Device 006: ID 0424:7800 Standard Microsystems Corp. Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub Bus 001 Device 002: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub I think it only sees 1 USB connection at a time, Is there a way i can monitor both via usb on the same system?