Copyright 2011-2020, RFXCOM
RFXtrx Version 5.68 page 58 / 70
19. RFXtrx433XL - Connection points for a serial interface
This connection can be used for a serial connection with the RFXtrx433XL instead of the USB
interface.
The serial interface is using logic level of 5V maximum.
WARNING: Do NOT connect a RS232 interface that operates at +/-12Volts!!
Important: warranty is lost if this modification is used.
• Cut the PCB trace between the connection point R and the FT230X pin 15.
• Connect the serial interface to GND, T and R. Be sure to use a 3V3 or 5V logic level!
• The +5V can be used to power and external interface if required. In this case the
RFXtrx433E must be powered by a 5V power supply connected to the USB interface.
The +5V can also be an input for powering the RFXtrx433XL. Do not exceed +5V or the
RFXtrx433XL will be destroyed.
• The serial interface is using 38400,N,8,1
• Be sure not to use a serial device that produces RF noise at 433MHz. A bad example of
such a device is the USR-TCP232 LAN device.
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