通过自由口向别的系统发送数据
– baud rate 4 800;
– data bits 8 (D7 = 0), parity none;
– stop bits 1.
$--ALR,hhmmss.ss,*,A, A,c--c*hh
hhmmss.ss-----------Time of alarm condition change, UTC
*--------Local alarm number (identifier) [identification number of alarm source]
A-------Alarm condition (A = threshold exceeded, V = not exceeded)
A-------Alarm’s acknowledge state, A = acknowledged, V = unacknowledged
c--c*hh--------Alarm’s des cription text
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