X25AM Programming Manual

ITI Applications
X25AM Programming Manual—527201-001
2-4
Waiting for a Call
address must be specified before the CONTROL is issued. This is done with the SCF
subdevice (SU) attribute DESTADDR when the subdevice is configured or with
SETPARAM 1 in your application.
The network response to a Call Request can be one of the following:
•
Call Connected: The call was connected.
•
Clear: The call was disconnected.
•
Restart: The network interface was restarted, and the call has been cleared.
If the CONTROL 17 completes normally, then the call has been connected. If it does
not complete normally, the error returned indicates the cause of the failure. Your
application is responsible for determining how the outcome of the Guardian procedure
call should be processed.
Waiting for a Call
Your application waits for a call when it has been agreed that the remote terminal will
start the data exchange. Waiting for a call means that a Incoming Call is received, and
a Call Accepted is sent.
Your application waits for a call with a CONTROL 11 that results in an Incoming Call
being received and a Call Accepted being sent. If the operation completes normally,
then the call has been connected. The application is responsible for determining how
the outcome of the Guardian procedure call should be processed.
Initial PAD Parameter Configuration
These parameters are set to a standard configuration each time a switched virtual
connection (SVC) is established. Regardless of whether the call is initiated or accepted
by ITI, a SET PAD PARAMETER command is sent to the PAD.
This initial PAD configuration can be configured for the line or for the subdevice. It can
be specified by the operator with SCF, or it can be a default configuration that depends
on the SCF subdevice attribute REMOTENET.
Exchanging Data
Data is exchanged with READ, WRITE, and WRITEREAD requests. With ITI and a
remote terminal, however, READ, WRITE, and WRITEREAD have specific applications
for both conversation and page mode. These file-system procedures must be used
according to the following specifications.