Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90051)

174 Chapter9
Describing Asynchronous Devices
How MPE/iX Identifies Devices
Terminal users should know the physical device address for their
terminal. If a terminal is having problems, the physical device address
is needed to troubleshoot the terminal. The physical device address
consists of identifiers for the DTC, the interface card, and the port to
which the device is connected. Refer to “Device Physical Path” later in
this chapter for more information.
Plotters
Sometimes plotters are connected to a DTC. Plotters, like printers,
always have assigned ldev numbers (always a nailed device).
UPSs
HP PowerTrust UPSs can be connected to DTCs as nailed devices. Only
the MPE/iX operating system accesses these devices.
Other Non-Supported Devices
Devices that conform to Hewlett-Packard’s asynchronous protocol and
are capable of being physically connected to the DTC can be controlled
through Asynchronous Serial Communications (ASC). This includes
test instruments, data collection devices, etc. To determine if a device
can be non-nailed or if it must be nailed, refer to “Nailed Device” and
“Non-Nailed Device” in this chapter. Contact your Hewlett-Packard
support representative for more information on non-supported devices.
Take extreme care when connecting non-supported devices.
Device Physical Path
Each asynchronous device (excluding the system console, PADs, and
Telnet/iX devices) is connected to a port on an interface card within a
DTC; this is the device’s physical path. The address for the physical
path, or the physical device address, consists of identifiers for the DTC,
the interface card, and the port to which the device is connected. Note
that the physical device address can be used to troubleshoot a device
and its connection.