Hello, I have a BeagleBone Black with a "Serial Cape" (http://www.logicsupply.com/eu-en/cbb-serial/). This cape supports RS-485 which i'm interested in. Before i had this cape, i used a RS-485-to-USB-converter.
My problem: I try to read some data from an external device. It's very simple: The request is just "/?!\r\n" and then i get the data. With the RS485-to-USB-Stick i used this serial port configuration (with ser2net): /dev/ttyUSB0 9600 7DATABITS EVEN 1STOPBIT With the cape i tried this configuration: /dev/ttyO4 9600 7DATABITS EVEN 1STOPBIT Unfortunately this first try didn't work. I didn't get any response. I also tried this configuration: /dev/ttyO4 9600 7DATABITS EVEN 1STOPBIT RTSCTS I set the jumpers on the cape like this: J8: RS485 J7: UART4 RTS The RS485+ wire is connected to the RS485B port, and the RS485- wire is connected to the RS485A port. (https://docs.google.com/document/d/1sgurQ-7gLyn7g-Kg983NRM0aDkYEqHqy9dmrieX_RUM/edit page7) To get a better overview i made a photo: <https://lh3.googleusercontent.com/-DGOBBHIo6sM/Vd1xuVsgc_I/AAAAAAAAAEE/JS4oAhPYoOk/s1600/IMG_20150826_091607_mod.jpg> At the bottom of the picture there is the RS485-to-USB converter. It just has two ports which i used to connect the RS485 wires. I think the board itself should work, because if i execute "cat /sys/devices/bone_capemgr.*/slots" i can see it. My question: Do i do something wrong? Maybe someone else has used this cape with RS485? I thought it should be almost as easy as with the USB converter? Thank you for any help Best regards Benj -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
