6100 MPS-B Programming Manual

INTRODUCTION TO 6100 MPS-B

6100 MPS-B Concepts and Context

• You can trace text frames and control frames transmitted and

received on a line, driver calls and completions, and protocol

events in the LIU.

• Because the host processor is interrupted whenever there is a

request completion, polling may continue indefinitely as long

as: (1) there are terminals in the enabled state on the poll

list, (2) a "read" request is posted, and (3) the polled

terminals return a "no data" response.

6100 MPS-B CONCEPTS AND CONTEXT

Using 6100 MPS-B, your application controls a number of terminal

devices on a multipoint communication line. The communication

line must be properly configured before I/O operations can take

place. Each communicating entity is called a station; the

connection between stations is called a link.

Your application process communicates with stations connected to

the multipoint link using file system procedures containing task

requests. The CP6100 I/O Process is responsible for handling

(translating, queuing, and so forth) the requests which are then

passed to the 6100 MPS-B protocol module.

-----------------------------------------------------------------

| |

| _____________ ____________ ____________ |

| | | | | | | |

| |_____________| |____________| | Module | |

| |____________| |

|^|

| |___station-1 |

|||

| |___station-2 |

|||

| . . |

| |___station-n |

| |

-----------------------------------------------------------------

Figure 1-1. 6100 MPS-B Communication Flow

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