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

Chapter 9 181
Describing Asynchronous Devices
How Operation Modes Set Functionality
Slaved Devices
If two devices share the same port in the DTC (one device is connected
to the port and the other device is connected by an additional cable to
the first device), only one device is recognized by the DTS software. The
device that is recognized is referred to as the master device, while the
other device is called a slave device. The master might or might not be
the device that is physically connected to the port.
NOTE The existence of slaves is not known to the DTS software or the MPE/iX
operating system. Therefore, slaved devices are not supported.
A wide variety of devices can be connected as slaves, such as terminals,
printers, card readers, flexible-disk drives, cartridge tape units, and
plotters. Slaves can be connected in the following ways:
• As pass-through slaves (also called eavesdrop).
• As remote slaves (also called end-of-the-line).
UPS Devices on the DTC
Ports on the DTC can be configured to support UPS connections. When
a DTC port is configured and connected to a UPS, the port is able to
receive status messages about the condition of the UPS. These
messages are passed on to the operating system and displayed as
console messages. When a DTC port is configured for a UPS connection,
the port cannot be used as a session-accepting device.
Configuration of DTC ports for UPS connections is similar to port
configuration for terminal connections. To configure a port for a UPS
connection, a profile is needed which is identical to TR10D96 except for
the following parameters:
• Line speed is set to 1200.
• Allow :HELLO logon? field is set to N.
• First device class field is HPUPSDEV.
The sample configuration file, NMSAMP1.PUB.SYS, contains the profile
UP10D12 which is configured with the above parameters. Enter this
profile in the Profile Name field on the Async Card Configuration
Screen for the DTC port corresponding to the UPS connection.
For DTCs under PC-based management, you must configure the correct
baud rate using the OpenView DTC Manager.
For more information on the UPS, refer to Performing System Manager
Tasks.