Hp E1368A User Manual download pdf (Page 44)

Recalling and Saving States

This section contains information about saving and recalling switch states.

Storing States The *SAV <numeric_state> command saves the current instrument state.

The state number (0-9) is specified in the

<numeric_state> parameter. The

following settings are saved:

• Channel States (open or closed)

• ARM:COUNt

• TRIGger:SOURce

• OUTPut:STATe

• INITiate:CONTinuous

• SCAN:MODE (not used)

• SCAN:PORT (not used)

Recalling States The *RCL <numeric_state> command recalls a previously saved state.

Enter the number (0-9) in the

<numeric_state> parameter of the desired

saved state. If

*SAV was not previously executed using the selected

number, the Microwave Switch will configure to the reset values.

Detecting Error Conditions

This section discusses using the various Microwave Switch registers to

detect if a switching operation has generated an error. There are two

general approaches to error checking. The simplest, but most time

consuming, is to ask the instrument whether there are errors at every step of

the switching process. This is called "polling" and is illustrated in the

following example .

05 DIM Err_num$ [256]

10 OUTPUT 70915; “CLOS(@100);:SYST:ERR?”

20 ENTER 70915;Err_num$

30 IF VAL (Err_num$) 0 THEN

40 PRINT “Error”;Err_num$

50 STOP

60 END IF

70 …(program continues)

The other approach involves the use of interrupts. The following program is

a method of checking for errors using interrupts as you program the

Microwave Switch. The program monitors the Microwave Switch’s

Standard Event Status Register for an error condition. If no errors occur,

the Microwave Switch functions as programmed. If errors do occur, the

Microwave Switch interrupts the computer, and the error codes and

messages are read from the error queue. This approach requires less

checking, but is more complex.

Chapter 3 Using the HP E1368A/69A/70A Modules 43

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