Class COM_DEVICE

-- Current control parameters for this device

-- Handle to communications resource

-- Current control parameters for this device

-- Current control parameters for this device

-- Is the device open for reading and writing?

-- Close the device.

-- Open the device. If open was successful set is_open
-- If open failed see errno for details.

-- Configures the device according to the specifications in a_settings.
-- Overall timers use SIGALRM. If an overall timer is used Current must
-- have exclusive access to SIGALRM.

-- Configures the device according to the specifications in a_settings.
-- Overall timers use SIGALRM. If an overall timer is used Current must
-- have exclusive access to SIGALRM.

-- If the device is still open then close it

-- Read count bytes into the data buffer. Set last_read_count
-- to the number of bytes read. Set timed_out if less than count
-- bytes were read. See timeouts to determine when read will
-- be completed.

-- Write data to the device. Set last_write_count with the
-- number of bytes written.

-- Total read timer, in milliseconds.