Where is RS-485 ENABLE (was DIO7) on cellular XBee 3 LTE-M/NB-IOT?

XBee & XBee Gateway XBee - Cellular
1

I’ve used many XBee/XBee3 900 MHz, 2.4 GHz, etc.
You could set DIO7 to 7 “RS-485 Enable, High” on all of them.

When data is ready to go out via serial, this pin would go high.
This puts the RS-485 transciever chips in transmit mode, to send this data out over RS-485.

How/Where is such an option on the XBee 3 LTE-M/NB-IoT ?

2

As far as I am aware of, it does not support RS485 within the firmware. You could instead write a custom Micro Python application and trigger one of the DIO lines as an RS485 TX enable pin. Then forward the data out the Micro Python Data In and data out lines.

1 Like
3

OK.
I’ll try a THVD1406DR RS-485 transciever chip that has an AUTO-ENABLE feature.

Thank you

4

The THVD1406DR RS-485 transciever chip works fine.

You do need to configure DIO7/CTS (pin12): Change from “CTS Flow Control (1)” to “Digital Out, High (5)”
This puts the THVD1406DR into Auto mode.
(this is presuming pin 12 is wired to the enable pins on the transciever chip)