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

Chapter 7 139
Programming for PAD, DTC Telnet, Telnet/iX Server, and VT Devices
DTC Telnet Access to MPE/iX Systems
with DTC Telnet devices. DTC Telnet devices must be configured as
non-nailed TIO terminals. The terminal type for these terminals must
be set at 10 or 18.
For more information on configuration see both Configuring Systems for
Terminals, Printers, and Other Serial Devices and Using the OpenView
DTC Manager.
General DTC Telnet Restrictions
Some basic limitations apply to the way transmission occurs and to the
operations that are supported over DTC Telnet connections:
• Use of a DTC Telnet terminal as a console is not supported.
• Use of customized terminal type files is not supported over DTC
Telnet.
• Typeahead mode is not supported over DTC Telnet.
• Binary mode transfers are not supported between a DTC Telnet
terminal and an MPE/iX host.
• User Block Mode and HP Block Mode applications are not supported
on DTC Telnet devices. Only VPLUS block mode applications may be
run from DTC Telnet devices; no other types of block mode may be
used.
• Parity generation and checking are not supported programmatically
over DTC Telnet.
DTC Telnet Programming Considerations
Most file system intrinsics can be used to control devices connected to
DTC Telnet as if the devices were locally connected. Both the
FCONTROL and FDEVICECONTROL intrinsics are supported for
DTC Telnet device control. In most cases the device control calls work
as they would with non Telnet connections.
There are, however, a number of differences in the way device control
functions operate over DTC Telnet connections. The individual
differences in the operation of each FCONTROL and
FDEVICECONTROL call are documented in the Intrinsics Reference
chapter of this manual. The following summary is provided here for
your convenience.
FCONTROL
Some FCONTROLs are ignored by DTC Telnet. These are calls that
attempt to control some function that is not supported over DTC Telnet,
such as changing terminal speed or setting parity. These calls will
return a CCE condition code, but no device control action will take
place. Any values returned in these calls may not be a true reflection of
device control settings. These FCONTROLs include: