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

146 Chapter7
Programming for PAD, DTC Telnet, Telnet/iX Server, and VT Devices
Virtual Terminal Access on MPE/iX Systems
• FCONTROL(36), define parity setting.
• FCONTROL(37), set terminal type and speed.
• FCONTROL(40), determine current speed.
The following FCONTROLs are not supported when the remote device
is a PC or an HP-UX client. VT will return a CCE condition code even
though no device control will take place:
• FCONTROL(23), disable parity generation and checking.
• FCONTROL(24), enable parity generation and checking.
• FCONTROL(38), set terminal type.
Additionally, for FCONTROL(38), not every terminal type will be
supported for use with VT.
The following FCONTROLs are not supported when the remote device
is an HP-UX client:
• FCONTROL(26), disable binary mode.
• FCONTROL(27), enable binary mode.
• FCONTROL(28), disable user block mode.
• FCONTROL(29), enable user block mode.
• FCONTROL(34), allow printing of !!! when line deletion character
is entered.
• FCONTROL(35), prevent printing of !!! when line deletion
character is entered.
The param of FCONTROL(41) is a 16-bit unsigned integer by
reference. The value passed in bits (0:8) is used as a subsystem break
character and the value passed in bits (8:8) is used as a read
terminator. HP-UX (VT3K) and MPE V VT do not allow the subsystem
break character to be redefined. Altering the read terminator, bits (8:8),
is supported; however, bits (0:8) should be
[CTRL]Y to keep existing
subsystem break status unchanged, or set to 0 along with bits (8:8) to
return to edited mode.
FDEVICECONTROL
The FDEVICECONTROL intrinsic is also supported on MPE/iX
systems with VT connections. However, there are also several
limitations on the device control operations they perform. The following
discussion deals with parm1 values with 192 specified as
controlcode.
Results will vary when an application uses an unsupported
FDEVICECONTROL call. If the application host is an MPE/iX system,
the VT driver will discard the FDEVICECONTROL and return a CCE
condition code even though no device control action will take place. In