HP 53181A Programming Manual page 73

Programming Your Counter for Remote Operation
Using Multiple Commands
or
:INP:COUP AC;:INP:IMP 50
The ":" must be present to distinguish another root level command. For example:
:INP:COUP AC;:INIT:CONT OFF
is equivalent to sending:
:INP:COUP AC
:INIT:CONT OFF
If the ":"(which is following the ";" and is in front of INIT) is omitted, the Counter
assumes that the second command is ":INP:INIT:CONT OFF" and generates a
syntax error.
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