The values and definitions for the RXstate parameter are:
- -1 : waiting for receive data.
- 1 : receiving data.
- 2 : waiting for backplane transfer
the values and definitions for the TXstate parameter are:
- 0 : waiting for data to send out the port
- 100 and 101 : message delayed for transmission
- 1 : RTS on
- 2 : RTS timeout
- 30, 31, and 32 : intercharacter delay
- 3 : sending message
- 4 : waiting for RTS off
- 5 : RTS turned off
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