HP 53150A Series Programming Manual page 173

Chapter 5 Errors
Error Types
Table 5-2. Errors (Continued)
Number Error String
-420 Query UNTERMINATED
-430 Query DEADLOCKED
-440 Query UNTERMINATED after
indefinite response
Programming Guide
Cause
Indicates that a condition causing an UNTERMINATED Query error
occurred. For example, the Counter was addressed to talk and an
incomplete program message was received.
Indicates that a condition causing a DEADLOCKED Query error
occurred. For example, both input buffer and output buffer are full and
the Counter cannot continue.
Indicates that a query was received in the same program message after
a query requesting an indefinite response (for example, *IDN? or *OPT?)
was executed.
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