6100 MPS-B Programming Manual

SECTION 3
WRITING APPLICATIONS THAT USE 6100 MPS-B
An application that communicates with stations on a 6100 MPS-B
line must perform several tasks to ensure successful
communication. The tasks are (in order of usual occurrence):
• opening the line
• setting line parameters
• defining and controlling the station poll/select list
• transferring data
• closing the line
An additional task must be performed from time to time:
• recovering from errors
A description of each of these tasks is contained on the
following pages. For each task, you will find information about
what requests to make, what responses to expect, how the task
differs for various types of line and stations, and what special
factors you must take into consideration for your application.
OPENING THE LINE
Any application that wants to use the line must first open it.
You accomplish this task with a call to the GUARDIAN OPEN
procedure described in the System Procedure Calls Reference
Manual for the NonStop systems.
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