Bristol Babcock Network 3000 Setup Manual page 63

Chapter 4 - Guidelines For Configuring the BSAP Data Link
An example is shown below:
Notes For Remote Process I/O Users
If you are using Remote I/O Racks (RIO 3331) connected to a DPC 3330, DPC 3335
or RTU 3310 host, an RIOR Port must be created. Configuration information on
these ports is included in the 'Communication Ports' section of the ACCOL II
Reference Manual (document# D4044). For details on setting the poll period for an
RIOR Port, see the discussion on poll periods in the 'System Signals' section of the
same manual.
Network 3000 Communications Configuration Guide
communication throughput because it gives the Slave
node time to get data ready for the Master, thereby
reducing the number of 'ACK NO DATA' messages to its
Master, and the subsequent additional data requests from
the Master. (An 'ACK NO DATA' is simply the Slave
telling the Master that it received the request, but it has
no data yet to give.) This value can range from 0 to 2.55
seconds (with a resolution in milliseconds).
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