Barco NSL-4601 User Manual page 60

Ack type1.
This kind of command isneed return value command.
Ack type2.
This kind of command is no need return value command so reply only set ID and Ack or
Nack.
RS232 Protocol NSL-4601
The monitor received a valid command and was able to
immediately process the command within given timeout
conditions.
Nack : hexa 0x15 is used.
The monitor received correct head and ID command but
received invalid format or unknown or unsupported
command or parameter value. This answer is also send
when the current device state does not allow the
requested command. In this case search for logical
programming errors and retry the command.
Skip Case1: Incorrect Head command.
Case2: Correct Head but ID is not match with monitor's
set id.
Case3: All set control command.
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