Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

210 Chapter8
Intrinsics Reference
FDEVICECONTROL
characters per second): 30, 120, 240, 480, 960, and
1920, (and 3840 for DTC 72MX direct connected devices
only).
If this call is issued against a device connected through
a PAD, DTC Telnet, or Telnet/iX connection, the
terminal control will be ignored, and a meaningless
value (120 for 1200 baud) will be returned in the call.
For VT connections, the value returned will typically be
960 (for 9600 baud) but this value has no meaning.
4 Set echo at a terminal.
This directive enables and disables echoing of read data
by the DTC. It is the same as FCONTROL (12, 13). If
buffer equals 0, read echo is set to off. If the buffer
value is 1, read echo is set to on.
This directive is not supported for use with VT.
Changing echo on the local client of a VT connection
may result in the remote host receiving false echo
status; hence, it is not recommended for VT
connections.
5 Set system break response.
This directive enables and disables the response to the
system
[Break] key at the terminal. It is the same as
FCONTROL (14, 15). A buffer value of 0 disables
system
[Break]. A buffer value of 1 enables system
[Break] response.
6 Set subsystem break response.
This directive enables and disables the response to the
subsystem break character at the terminal. It is the
same as FCONTROL (16, 17). A buffer value of 0
disables subsystem break response. A buffer value of 1
enables subsystem break response.
For terminals connected via PAD, the subsystem break
must be followed by a
[Return] to signal the PAD that
data is ready to be forwarded.
8 Obtain time used for completion of last read.
This directive returns the amount of time, in seconds,
required for the last read to complete. Since all reads
are timed on MPE/iX systems there is no need to enable
the timer. However, you should be sure that your call to
this intrinsic is before the next read. Only Read access
is allowed for this request. It is the same as
FCONTROL (22). This directive is not supported for
Telnet/iX or VT connections.