Specifications

136 Chapter 10

Error Handling

Sample Program

Example 10-1 is a sample program for detecting an error via an SRQ. This program is

given the file name srq_err.bas and is stored on the sample program disk.

This program performs the necessary SRQ settings, intentionally sends a command that is

not supported by the 4287A to cause an error, and then handles the error after it occurs. In

the error handling, the error is identified and its error number and message are displayed

followed by a message showing that the program is aborted.

Lines 40 to 50 Sets the GPIB address and select code.

Lines 70 to 80 Sets bits 2, 3, 4 and 5 of the standard event status register to be enabled

and sets bit 5 of the service request enable register to 1.

Lines 90 to 110 Clears the status byte register, standard event status register, and error

queue.

Lines 130 to 140 Sets the branch target for an SRQ interrupt to enable SRQ interrupts.

Lines 150 to 240 Sets measurement parameters 1 through 4, intentionally specifying an

incorrect command for parameter 4 to cause an error.

Lines 270 to 280 Performs error handling. The number and message of the error are

read out.

Lines 290 to 310 Displays a message showing that an error has occurred, the error

number, error message, and another message indicating that the

program is aborted.

Line 330 Displays a message for normal termination of the program. Note that

this will not be displayed unless the program is modified to employ the

appropriate command for measurement parameter 4.