I am endeavoring to use the RS-485 driver on a TS-752 driven by a TS-7550
board. I successfully open /dev/pts/1 and can write data to the port which is
reflected back to me, exactly as it should on a two wire RS-485 interface with
the transmitter enabled. My problem is I can not disable the transmitter (ie
place it in the high impedance state). Using setdiopin 27,0 or setdiopin 27,1
makes no difference. The data is reflected (ie the transmitter is enabled) in
either case. This is the dio that is supposed to control the tx enable of the
driver. I have tried this with versions 4, 5 and 6 of the FPGA bitstream.
Anyone had this experience or ideas or know the obvious thing I am missing.
Thanks in advance,
Greg
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