Owner`s manual

14
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NOTE: For illustration purposes, the factory default port select code
($SELECT) will be used in the following descriptions of the Modes of
Operation. Section 5.2 provides more detail for operating in the various
modes.
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Mode of Operation 1 increases input/output by interfacing a single port
on a computer to up to 23 peripheral devices. The communication is
full duplex between the host device and the selected peripheral device.
For the host device to select a specific peripheral port, it would send
$SELECT, the desired port number (02 to 24), and a terminating
character (0D Hex - Carriage Return or 0A Hex - Line Feed ). The host
remains connected to the selected peripheral port until another
peripheral port is selected.
For example, if the host device wishes to select the device connected
to Port 4, it would send $SELECT04<CR> where <CR> is a Carriage
Return .
NOTE: Peripheral port selection is done in the manner described
above for all Modes of Operation.
Factory default is Mode 1 with the host port connected to port 2 on
power-up.
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Mode of Operation 2 provides multiplexing to the host port of all
messages from all peripheral ports automatically. Data is buffered until
an end of message terminating character is received or until the buffer
is full. The messages are sent to the host device preceded by a port
identification number corresponding to the port number of the
peripheral port that actually sent the message.