AM3270/TR3271 Reference Manual

Details of the PTP Protocol
TR3271 Subdevice Protocols
086705 Tandem Computers Incorporated 6–9
Sample Configuration Figure 6-3 shows a TR3271 process emulating a cluster controller with two terminals,
X1 and X2.
Variations on this figure appear in Section 5, “A Closer Look at TR3271,” showing two
simpler configurations. Since Figure 6-3 portrays a much more complex configuration,
you may find it helpful to compare the figures.
Figure 6-3. TR3271 Process Configuration
TR3271
X1
(PTP)
X2
(CRT)
Pass-
through
to T2
Accessed
by AP2
AM3270
Tandem
AP3 AP1
C.I.AP2
Host
3271
Cluster
Controller
$TR
3270 Terminals
and Printers
021
3174/3274
Cluster
Controller
T1
(CRT)
T2
(PTP)
T3
(ITI)
P1
(PTR)
$AM
Accessed
by AP1
Pass-through
to X1
Command
Interpreter
Accessed
by AP3
3270 Terminals
and Printers
These are the elements in the figure shown above:
SCF is used to configure two subdevices on the line, X1 and X2:
Subdevice X2 is configured to be in CRT mode for the application interface AP2.
Application program AP2 simulates a subdevice and opens $TR.X2, where $TR is
the name of the line as configured at system generation.
The AM3270 process controls three terminals and one printer connected to a 3271
controller. The line has been configured during system generation as $AM.
SCF is used to configure four subdevices, T1, T2, T3 and P1:
Subdevice T1 is configured in CRT mode, since it is accessed by application
program AP1.
AP1 opens $AM.T1, and is programmed to carry out all screen format operations.
SubdeviceT2 is configured to be in PTP mode for pass-through operation.