On Tue, 16 Jun 2020 20:57:11 -0400, Steve Lentz writes: >RS-485 is a multi-drop bus using 2 or 4 wires. It does not include >hardware flow control and hence the RTS signal is not used.
yes and no; those signals have no native meaning in rs485. but if you've got a 2-wire rs485 bus then you're half-duplex with no more than one transmitter allowed active at any time. in all likelihood your rs485 line driver chip will need to be told that its transmitter is to be enabled (the DE aka driver output enable pin on your garden variety max488 etc.) the kernel (https://www.kernel.org/doc/html/latest/driver-api/serial/serial-rs485.html) does mention that for some wiring setups & drivers that output enabling can be done via one of the flow control signals. regards az -- Best Regards, Alexander Zangerl IT Engineer BREATHE-SAFE intelligent cabin air filtration Keeps your lungs and cabin dust free! Head Office: 37-43 Argon Street, Carole Park QLD 4300 Australia Western Australia: 169 Chisholm Crescent, Kewdale WA 6105 Tel: +61 7 3276 7833 M. +61 415 482 341 E. a...@breathe-safe.com -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/15833-1592356259.332451%409Amj.Jgoj.4ze6.
