TOHO ELECTRONICS TTM200 - Manual (Page 21)

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h) Error code
If a message from a high-level computer is error-ridden, it will be incorporated in the
"response message" from this product and returned.
If there are two or more errors occurring at the same time, the largest error number will be
incorporated.
The table below indicates the error contents and classifications.
Error No. Error contents in the "request message" received by this product
01 Received an unsupported function code.
02 Received an address other than the specified one.
03 The numerical data deviated from the "range of settings designated specifically with
setting items."
04 Instrument error (memory error or A/D conversion error, AT error)