MYERS Illuminator Supernova Series, Installation Manual

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115895B System Installation Manual
MODBUS SERIAL COMMUNICATION OPTION SECTION
o
0x2F (47) is the file read response length (including the Reference
Type byte)
o
0x06 is the Reference Type (fixed)
o
The last 46 bytes of the PDU are byte pairs. If you eliminate all the
(0x00 valued) most significant bytes of each byte pair, you are left
with the ASCII data read out of the Alarm Log file:
39 2f 30 38 2f 32 35 09 32 32 3a 31 34 09 4c 4f
57 20 56 41 43 0D 0A
Note that 0x09 is the
‘tab’ character, and 0x0D 0x0A is a DOS style
line ending (
“\r\n”). The ASCII would display as:
9/08/25 22:14 LOW VAC
•
Step 3 : Now we have only to combine the two received fragments of the
Alarm Log File to form the complete file, revealing two alarm events
logged on August 21
st
2019 and August 25
th
2019:
19/08/21 09:31 INVERTER FAULT
19/08/25 22:14 LOW VAC
Further information follows below on how to parse the data in Alarm Log,
Event Log and Test Log files.