Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 87
SET MESSAGE ACKNAK ON|OFF
The ACK/NAK confirmation is enabled with command SET
MESSAGE ACKNAK ON. After the transmission of the last character
of a message the FS11 system expects an ACK/NAK confirmation within
500 ms. If the FS11 receives an ACK character (ASCII 06) within
500 ms, message sending will continue as configured by the SET
MESSAGE INTERVAL command. If the FS11 receives a NAK
character (ASCII 16) within 500 ms, message sending will be repeated
immediately. If the FS11 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 command SET
MESSAGE ACKNAK OFF.
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