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OMI - Stream and Record

Draft MDC Standard

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5.3.8 Stream and record forms of data

The server shall indicate in the get device parameters transaction (see 5.4.27) whether record boundaries are significant to the device. There are 3 forms:

  1. The agent shall preserve the identity of each writeargument in the client routine. Each writeargument produces exactly 1 write argument in the request, that is, 1 record for the server.
  2. The agent may combine string-type writearguments (see 5.3.9.1) before transmitting their values. That is, 1 or more writearguments may produce 1 write argument in the request, streaming the data to the server.
  3. The agent may combine or divide string-type writearguments before transmitting their values. Parts of 1 or more writearguments may produce 1 write argument in the request, streaming the data to the server.
    NOTE – Form 2 permits the agent to divide multi-byte sequences between 2 write arguments or even between 2 write transactions. This form should not be used for devices that attach significance to, for example, escape sequences, because the device's status ($X, $Y, $DEVICE, $KEY) may be undetermined at the end of a write argument.
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Copyright © Standard Documents; 1977-2018 MUMPS Development Committee;
Copyright © Examples: 1995-2018 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2018 Ed de Moel.

Some specifications are "approved for inclusion in a future standard". Note that the MUMPS Development Committee cannot guarantee that such future standards will indeed be published.

This page most recently updated on 13-Sep-2014, 14:18:46 .

For comments, contact Ed de Moel (demoel@jacquardsystems.com)