Garrett: I expanded my test program: 1. I turned off DUP_EN 2. I send four characters to the FIFO_D2M 3. I read FIFO_D2M, it says that there are four bytes in the FIFO 4. I turn on RTS bit 5. I read FIFO_D2M, it says that there are zero bytes in the FIFO 6. I turn on RTS bit wait 5 seconds and repeat... Scope trace on MOD_OUT shows a flat line up to the point where I raise RTS then I get a constant sine wave until RTS goes low and then get a flat line: ken
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