Rockwell Automation 6008-SI IBM PC I/O SCNNR 6008-SI - Manual (Page 50)

Chapter 5
Startup, Status, and Shutdown
5-7
This section tells you about three ways your program can monitor the
status of the scanner:
Global variable g_op_stat contains status bits that tell you the current
scanner operating mode and fault conditions. You can use the function
xlat_opst to convert the status bits to English.
Global variable g_act_scnr is positive as long as the scanner is still in
communication with the host.
Function fatal_6008 returns a code to describe the nature of the scanner
shutdown after it is no longer communicating with the host.
g_op_stat
At any time after the initial call to setup_6008 or start_6008, your
program can monitor the unsigned variable g_op_stat. This variable is a
set of bit fields, and you can test for a particular condition by ANDing a
symbolic constant with g_op_stat.
For instance, SO_FAULT is the symbolic name of the bit field that is true
(nonzero) when any adapters are faulted. To find out if any adapters are
faulted, your program would use this statement:
if ( SO_FAULT & g_op_stat )
/* one or more adapters are faulted */
else
/* no adapters are faulted */
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