Driver for the 1200 Baud Baycom modem connected to the COM interface.
COM1-4 may be specified directly, different port addresses or IRQ numbers
are optional. Only 1200 Baud half duplex operation is supported. Port addresses
may be given in decimal or hexadecimal notation, prefixed by "0x".
The driver features a software DCD that can be enabled if the squelch
of the transceiver is too slow. However, the recommended mode of operation
is without software DCD, as a proper hardware carrier detection is more
reliable and causes less load on the computer.
Warning: The statistics do not recognize any TX or RX errors
because the hardware does not allow that. Some experimenting is required
to know if the computer or the configuration in conjunction with the other
channels allows an error free operation.
Note: Problems have been reported running ser12 on some notebooks
and some state-of-the-art computer mainboards with onboard UARTs. It seems
that some brand of I/O controllers lack special features that are needed
for the ser12 driver to perform properly.