On 7/7/2019 4:29 AM, Michael Brown wrote: > Looking at a 7i76e manual it's differential RS422 while the > example configs suggest at the FPGA level it's a 2 pin RX/TX deal, > is that right? One example shows a TX enable pin, but I don't > think this is implemented on a board like the 7i76e which is all > I'm trying to duplicate. Any insight on this? > > I have no experience with rs422 or rs485, but i guess yes....
RS-422 is always differential. It may be full duplex (which only requires TX and RX) or half duplex (which adds a TX-Enable signal). The 7i76 daughtercard requires two SSERIAL channels, one for the 7i76 itself (for the Field I/O signals), and one which gets exported via the TB3 connector. Both buses are full duplex and do not require a TX-Enable signal. The SSERIAL communication between the FPGA and the 7i76 is via standard digital logic levels. The 7i76 provides an RS-422 transceiver for the SSERIAL bus on TB3. -- Charles Steinkuehler [email protected] -- website: http://www.machinekit.io blog: http://blog.machinekit.io github: https://github.com/machinekit --- You received this message because you are subscribed to the Google Groups "Machinekit" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. Visit this group at https://groups.google.com/group/machinekit. To view this discussion on the web visit https://groups.google.com/d/msgid/machinekit/c967f07a-584e-eedc-1940-4959cdb40f63%40steinkuehler.net. For more options, visit https://groups.google.com/d/optout.
