Owner`s manual

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module in order to issue the clear buffer command. This
is done by sending the port select code, the appropriate
Unit Number followed by a colon (1: to 30: - only if
using cascaded units), the module number (2 to 16),
and Carriage Return or Line Feed. You can issue the
clear buffer command for multiple ports by separating
the port numbers with a comma. For example, to clear
the receive buffer for Ports 1 through 3 of the selected
module, send CB1,2,3<cr>. The other four supported
commands can be issued in command reporting mode
only (see Section 15.2.3).