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Example: Using the
Scan Complete Bit
You can use the Scan Complete Bit (bit 8) in the Operation Status Register
of a switchbox to determine when a scanning cycle completes (no other bits
in the register apply to the switchbox). Bit 8 has a decimal value of 256 and
you can read it directly with the
STAT:OPER? command (refer to the
STATus:OPERation[:EVENt]? command in Chapter 4 for an example).
When enabled by the
STAT:OPER:ENAB 256 command, the Scan Complete
Bit will be reported as bit 7 of the Status Register. Use the HP-IB Serial
Poll or the IEEE 488.2 Common Command
*STB? to read the Status
Register.
When bit 7 of the Status Register is enabled by the
*SRE 128 Common
Command to assert an HP-IB Service Request (SRQ), you can interrupt the
computer when the Scan Complete Bit is set, after scanning cycle
completes. This allows the controller to do other operations while the
scanning cycle is in progress.
The following example monitors bit 7 in the Status Register to determine
when the scanning cycle completes. For the example, use:
• an HP-IB select code of 7, primary address of 09, and secondary
address of 15 for the Microwave Switch
• an HP Series 200/300 Computer with HP BASIC
Figure 3-9. Example: Multiple Channel Scanning
Chapter 3 Using the HP E1368A/69A/70A Modules 41