Specifications

134 Chapter 10

Error Handling

Using the Error Queue

When an error occurs, its number and message will be stored in the error queue. Thus, you

can determine which error has occurred by reading the contents of the error queue. Use the

folowing command to read the contents of the error queue:

• :SYST:ERR? on page 304

You can also use the following command to check how many errors are contained in the

error queue:

• :SYST:ERR:COUN? on page 304

Some examples of using the error queue are given below:

1. Use the error queue for branching control of the program in response to an error. If no

error has occurred, the contents read out from the error queue are 0 for the number and

“No error” for the message. This can be used to verify the occurrence of any error and

is thus useful for the branch processing flow of your program. This is also used to

handle a specific error that may be predefined in the program. This method, however, is

not suitable for performing tasks synchronized with the occurrence of errors.

2. Use the error queue to identify an error that is detected via an SRQ (service request)

(see Example 10-1).