NEC NP-M311W Command Manual page 56

======================================================================
6.1. Response
----------------------------------------------------------------------
* At the time of a success (ACK)
This returns ACK without adding data portion to the command that does not request data.
This returns ACK with adding data to the data portion for the command that requests data.
* At the time of a failure (NAK)
This adds a cause of not accepting the command to data portion to return it.
(Example) Power On
Command:
02H 00H FFH F0H 00H CKS
NAK:
A2H 00H 01H 20H 02H DATA01 DATA02 CKS
======================================================================
6. Data Portion of Response
----------------------------------------------------------------------
DATA01 DATA02
Error Error
Error contents
types description
00H 00H Unknown command
00H 01H The current model does not support
this function.
01H 00H Unvalid values specified.
01H 01H Specified terminal is unavailable or
cannot be selected.
01H 02H Selected language is not available.
02H 00H Available memory reservation error
02H 02H Operating memory
02H 03H Setting not possible
02H 04H On Forced on-screen mute mode
02H 07H -No signal-
02H 08H Displaying a test pattern or PC Card
Fills screen.
02H 0AH Memory operation failed
02H 0DH Power Off inhibited
02H 0EH Execution error
02H 0FH No operation authority
03H 00H Specified gain number is wrong
03H 01H Selected gain is not available.
03H 02H Adjustment failed