JRC JFE-380 Instruction Manual page 48

Alarm output
$SDALR,hhmmss.ss,xxx,A,A,c--c*hh<CR><LF>
(1)
(1) Time of alarm condition change,UTC
(2) ID number of the alarm source
351 primary depth alarm
352 secondary depth alarm
353 primary depth lost
354 secondary depth lost
356 printer paper is not good
357 printer connection is not good
360 primary transmit signal is not good
361 primary receive signal is not good
362 primary bottom echo signal is not good
363 secondary transmit signal is not good
364 secondary receive signal is not good
365 secondary bottom echo signal is not good
366 backup data area is not good
(3) Alarm condition (A = threshold exceeded, V = not exceeded)
(4) Alarm's acknowledge state (A = acknowledged, V = unacknowledged)
(5) Alarm's description text
(6)Checksum (result after each ASCII code of every character between"S" just after"$" and
"X" just before " * " is EXORed.)
4. Operation 36
(2) (3)(4)(5) (6)