Yamato Scientific CLH600 Cool Line - Manual (Page 37)

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Operation Method
RS485 Communication Function
⑨ NAK
This is a negative acknowledgement code and included and returned in the "reply message" from
the unit when there is an error in the "request message" received by the unit.
⑩ ERR type
If there is an error in the "request message" received by the unit, this code is included in the "reply
message" from the unit after "(9) NAK" to report the type of the error.
This is a communication-related error, and details of display are omitted.
If STX is not transmitted from the unit within the specified reply wait time after the host computer
receives BCC, it is considered receive time-out.