Owner`s manual

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modes of operation. Section 15.2 provides more detail
for operating in the various modes.
The default mode of operation is full duplex mode.
15.1.6.1 FULL DUPLEX MODE
Full duplex mode increases input/output by interfacing
the host module to four peripheral devices for each
module. The host system selects a specific port by
sending a port select sequence. The host system
remains connected to the selected port until another
port is selected. Data received by non-selected ports
are stored in a buffer until the port is selected or a clear
buffer command is sent.