Toho Electronics TTM-00BW, Operation Manual

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⑥ ETX
It is a code that is necessary for the receiving side to detect the end of the message.
It shall be attached to the end of the character string to be sent (except for BCC).
⑦ BCC
Get the Ex-OR of all characters from STX to ETX with the check code for the detection of
error.
This code shall not be included in the response message if BCC Check is turned OFF at the
communication setting of this product. See "2. Setting about TOHO Communication."
⑧ ACK
It is an acknowledge code that will be included in the "response message" to be replied by
this product if no error is found in the received message.
⑨ NAK
It is a reject code that will be included in the "response message" to be replied by this
product if error is found in the received message.
If there is an error in the received "request message, " content of error (⑪ Type of ERR)
will also be attached (next to NAK) to the "response message" that will be returned by this
product.
⑩ Type of ERR
If there is an error in the "request message" that was received by this product, the
description of the said error (number in the table shown below) will be attached (next to
"⑨ NAK") to the "response message" that will be returned by this product.
Since error number "0" indicates the breakdown of measuring equipment (memory error or A/D
conversion error), it will be included in the "response message" whether or not there is an
error in the "request message."
Since error number "9" indicates AT error, it will be included in the "response message" whether
or not there is an error in the "request message." Remove the cause of the error immediately
and restart the AT.
For multiple errors, the largest error number will be included.
Contents and classification of error are the following:
Error Number Description of errors in the "request message" that was received by this product
0 Malfunction of measuring equipment (memory error or A/D conversion error)
1 Numerical value data is out of the "setting range that is specified individually by
the setting item"
2 Changing of the requested item is prohibited or no item to read
3 ASCII code that is other than the numeric value has been set to the portion for the
numeric value.
ASCII code that is other than "0" or "-" has been set to the position for the symbol.
4 Format Error
5 BCC Error
6 Overrun Error
7 Framing Error
8 Parity Error
9 PV abnormality has occurred during AT or AT does not end although 3 hours have lapsed