RS232 vs RS485 Settings

[craigbeal]

#19867

The documentation for the FlexBench MPU suggests that RS232 and RS485 are both possible, and there is a DIP switch on the board. However, there is some glue around the DIP switch making it difficult to read the screen printing on the board. I also could not find any information about the serial interface anywhere on the site. I had serial communications working before but am wondering if it was a fluke since it looks like the DIP switch is set to RS485. It would be helpful to have a page devoted to serial communications, how it is set up on the FlexBench, and some example code in Python and with Simulink. I also noted that there is no photo of the interior of the FlexBench with the DIP switches shown. (Similarly, the footnotes on the datasheet don’t seem to lead to any actual notes.)

[AmirF]

#19872

Hi Craig,
There has been an issue with the setup of RS232/RS485 on FCB1.2. However, I remember we did apply a fix on the FCB unit that was sent to you. So on your FCB1.2, the RS232 is active by default. You don’t need to change any dip switches on the board to make it available.(I have also attached a picture of that area of the board.)
Unfortunately, RS-485 won’t be accessible because of the hardware issue on FCB1.2. Sorry about that.
For RS232 communications on RPi-CM4, you can use the UART0 on pins 51 and 55.
Thanks,
Amir

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[craigbeal]

#19879

OK, thanks for confirming. I think this explains the photo I sent on my other thread with the extra wires added to the board. I only need RS232, but wanted to make sure I didn’t have the switch set incorrectly.

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