A call to FCONTROL with a controlcode
value of 40 allows you to determine the line speed at which an asynchronous
port is currently operating. The speed is specified in characters
per second. You can use the information to return the port to its
original speed setting after you have changed the line speed through
FCONTROL(37) or FCONTROL(11).
Do not confuse the current line speed returned by this intrinsic
with the default line speed specified during system configuration
through NMMGR. Changing the line speed through the system intrinsics
can cause the current line speed to be different from the configured
line speed. To reset the line speed of the port to the default value
you can use FCONTROL(37) specifying 0 as the value of param.
(Note that FCONTROL(37) will restore the default terminal type as
well.)
Closing the device also restores its settings to configured
default values.
If issued against a terminal connected via PAD, DTC Telnet,
Telnet/iX, or VT, this call will return a CCE condition code. The
value returned in param will be 120 (for
1200 baud) but this value has no meaning for DTC Telnet, or PAD
connections. For Telnet/iX or VT connections, the value returned
in param will typically be 960 (for 9600
baud) but this value has no meaning.
