Bay Technical Associates 529H - Manual (Page 19)

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Mode of Operation 3 provides multiplexing to the host port of a single
message from all peripheral ports. Single messages from each
peripheral port are sent to the host device only when a request for
messages command is received. When the host device sends the
request for messages command, the multiport sends a complete
message from each peripheral port to the host device preceded by a
port identification number corresponding to the port from which the
message came. Complete messages are sent to the host port in a
round-robin fashion.

  
 

Mode of Operation 4 provides multiplexing to the host port of all
messages from a selected port. You select a specific peripheral port
and all complete messages in the buffer for that port are transmitted
to the host device automatically with each message preceded by a
port identification number.

  
 

Mode of Operation 5 provides multiplexing to the host port of a single
message from a selected port. You select a specific peripheral port
and a single message from that port is sent to the host device when
the host device requests it with each message preceded by a port
identification code.