Toho Electronics TTX-800 Operation Manual page 11

h) Error Number
If there is an error in the message that was sent by the upper computer, the error number will be included in the
"response message" of this product for the reply.
Contents and classification of errors are the following:
Error Number Description of errors in the "Request Message" that was received by this product
01 Received an unsupported function code
02 Received an unspecified address
Numerical value data is out of the "setting range that is specified individually by the setting
03
item"
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