6100 MPS-B Programming Manual

INTRODUCTION TO 6100 MPS-B
Features of the 6100 MPS-B Product
Table 1-1. Application Requests to the 6100 MPS-B Protocol
Module (Continued)
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| |
| Request Description |
| |
| WRITE Transmits a message to a specific |
| station or group of stations, |
| transmits a message and enables |
| station, or declares use of ENVOY |
| format for WRITE request. |
| |
| CONTROL Issues specific (nonstandard) reply |
| to received messages, or connects or |
| disconnects a modem for switched line |
| operation. |
| |
| POLL/SELECT LIST Defines poll/select list, enables |
| CONTROL continuous or noncontinuous polling, |
| halts polling, removes stations from |
| nonresponding list, or defines slow |
| poll list. |
| |
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Other important features of the 6100 MPS-B module are:
• The module supports a single multipoint asychronous or byte-
synchronous link.
• You can use either switched or leased lines, and either half-
or full-duplex modems.
• The maximum data rate on a link is 19200 bits per second.
• The electrical interface must be RS-232.
• An LIU running 6100 MPS-B can represent a master station or a
slave station. That is, the 6100 MPS-B protocol module
assumes the role of a master station to deliver a message to
one or more slave stations (selection state), or it gives up
master status to one of the other stations on the link and
assumes the role of a slave station to accept a message
(polling state).
• Two different data formats are supported--free format or ENVOY
format.
• Request errors encountered by 6100 MPS-B are returned in the
request/response buffer, rather than as file system errors.
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