VXIMonitor Subsystem
The VXI Monitor commands allow the user to monitor certain signals that only occur on the VXI backplane. The VXI Monitor commands allow the user to control how long to monitor (VXIM:TINT), continuously monitor (VXIM:RE- PEAT ON) and to start the VXImonitor (VXIM:STATE ON).
The VXIMonitor subsystem controls the parameters shown in Figure 3±10.
VXIMonitor
REPeat STATe TINTerval
Figure 3±10: VXIMonitor subsystem hierarchy
The VXI backplane is monitored in six areas:
<VXI signal> | Retrieve results using |
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|
BERR (Bus Error) | STAT:OPER:VXIM:BERR? |
SYSFAIL | STAT:OPER:VXIM:SYSF? |
ACFAIL | STAT:OPER:VXIM:ACF? |
AS (Address Strobe) | STAT:OPER:VXIM? |
VXI Triggers | STAT:OPER:VXIT? |
VXI Interrupts | STAT:OPER:VXII? |
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|
After operating the monitor, it is recommended that the summary register be queried to check if any of these events occurred. If the bit is set, then the corresponding register should be queried for more detail. For example, if the command ªSTAT:OPER?º yields a result of 32 (0 x 20), the VXI Trigger should be queried (ªSTAT:OPER:VXIT?º). This will determine which line was triggered. Knowing what line was triggered, the command ªSTAT:OPER:VXIT:TRIG? TTL2º (using trigger line 2 as an example) will yield the time (since power up) that this particular line was triggered. This time will only be erased when VXI Monitor is restarted.
Programming example;
1.Set up VXI Monitor to run continuously:
VXIM:REPEAT ON
2.For this example, assume that an external VXI module set a trigger line, asserted SYSFAIL, and a Bus Error occured.
VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual | 3±155 |