For half duplex communication with FSK modem over
leased line, I need modem control functions as follows:
1. similar to rs485mode, rts line is set to true before
transmission can start. The cts line is monitored -
packet is sent out only if cts becomes active after
programmable delay (0 ... x ms). If cts remains
inactive, packet is lost.
2. same function as above, but transmission starts
after programmable delay without monitoring cts.
In both cases, rts is deactivatetd after packet is sent
out or discarded.
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