Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 95
ACK/NAK Confirmation
In the automatic mode, the FS11P system can be configured to require an
acknowledgement for the message reception from the receiver of the
message. By default the ACK/NAK confirmation is disabled. The format
of the SET MESSAGE ACKNAK is the following:
SET MESSAGE ACKNAK ON|OFF
The ACK/NAK confirmation is enabled with the command SET
MESSAGE ACKNAK ON. After the transmission of the last character
of a message, the FS11P system expects an ACK/NAK confirmation
within 500 ms. If FS11P receives an ACK character (ASCII 06) within
500 ms, message sending will continue as configured by the SET
MESSAGE INTERVAL command. If FS11P receives a NAK character
(ASCII 16) within 500 ms, message sending will be repeated
immediately. If FS11P receives neither an ACK character nor a NAK
character within 500 ms, message sending will be repeated. Repeated
message sending due to received NAK character or missing confirmation
characters is repeated two times only. Thereafter, the message sending
continues according to the configured message interval. Time periods
spent for repeating messages do not interfere with the configured
message interval.
The ACK/NAK confirmation is disabled with the command SET
MESSAGE ACKNAK OFF.
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