Connect electronic scale serial port to usb to posbox odoo system (hw_scale)

It is required to connect an electronic scale, it currently has a physical connection serial port to USB, connected to a raspberry pi, raspberry with posbox (hw_scale), We modify a lines of the /controller/[login to view URL] referring to the port for the connection, now the status of the posbox indicates scale: connecting, but not able to connect. Main goal: Get the balance to connect to the odoo system to send the weight and it can recognize it.