Hioki DSM-8542, Instruction Manual, Page: 105 / 140

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7.10 Precautions for Listener Specification
7.10.1 Input buffer size
Plural command messages can be transferred once by linking them using message
separators.
The input buffer size of the DSM-8542 is 128 bytes and message character strings
exceeding 127 characters cannot be accepted. When this limit is exceeded, the entire
command will be ignored (skipped) and the MLE (Message Length Error) bit of the error
register will be set.
7.10.2 Input command message execute and message accept
Next messages are not accepted till execution of all received commands or of a
command string is completed.
Command message characters can be upper-case or lower-case alphabetical letters.
7.10.3 Command parameter trouble
If a parameter in a command message is faulty, this command will be ignored and the
DRE (Data Range Error) bit of the error register will be set.
7.10.4 Limit on command message execute
The following command messages can be executed only in a start state.
If executed in a stop state, no processing will be performed and a result of the previous
execution will return.
VCK?
and CCK?
The following command messages can be executed only in a stop state.
If executed in a start state, no processing will be performed. Executing OST? in a start
state, a result of the previous execution returns.
OST?, *SAV, *RCL, SEQ, *TST? and RBF?
Receiving a program message that was not executed sets the CNE bit in the error
register.
The read command RBF? of the measured data buffer needs be executed independently.
Be certain to execute independently.
7.10.5 Output buffer readout
Data in the output buffer is processed FIFO (first-in first-out) and is read beginning the
oldest data. For this reason, values that are read out sometimes differ from expected
values such as when responses are not fetched.
The output buffer size is 511 bytes and data written in the buffer exceeding this size will
be discarded, setting the QOF (Queue Overflow) bit of the error register.