User Manual 1260-14C
Module Specific Syntax 3-1
Chapter 3
MODULE SPECIFIC SYNTAX
Asynchronous
and Synchronous
Modes of
Operation
Each port on the 1260-14C can operate in either an asynchronous
or a synchronous mode. The number of synchronous mode ports
is modified by using the SETUP SYNC command. The default
after power-up or reset is for all ports to be in the asynchronous
mode. The current operating mode of the ports is determined at
any time with the PSETUP command. See the syntax description
of the PSETUP and SETUP SYNC commands for details and
examples.
Asynchronous
Mode
The asynchronous mode allows data to be read from or written to
a port in response to a READ or WRITE command. The following
restrictions apply to all asynchronous operations:
Those ports defined as asynchronous cannot participate in
synchronous operations.
Asynchronous commands are not allowed on any port
while synchronous operations are armed and waiting for
clocks.
Asynchronous WRITE commands are valid on
synchronous ports to allow the synchronous port to be
preset to a starting value. Asynchronous READ
commands are not allowed on synchronous ports.
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