ApexRp Operators Manual
248083480-1 Rev 3 64
Enable Alarming for a Channel
To enable alarming on particle channel #1, write a ’3’ to register
43010, which enables its Bit 1 and maintains Bit 0 as ’1’. To disable
alarming on channel 1 and enable it on channel 2, write a ’1’ to
register 43010 and a ’3’ to register 43012. To enable all, write a ’3’ to
43010, 43012, 43014 and 43016.
To disable alarming completely, write a ’1’ to disable Bit 1 to registers
43010, 43012, 43014 and 43016.
Table A-10 Example of Alarming on Channel 2
Use the Threshold registers to set the alarm threshold value. This is
described in the next section.
Threshold Setup Registers
Threshold data is stored in the input registers in the 45xxx series
which are read/write. All threshold data items are 4 bytes long and
are stored across 2 registers. Byte and word ordering is big-endian.
Thus, data items are formed by placing the high bytes in front of the
low bytes. For example:
<High Bytes><Low Bytes> = <4 Byte Data Item>
For particle channels, the threshold value is a 32-bit unsigned integer.
If the data value exceeds the threshold value and the alarm is enabled
for that channel, the threshold flag in the Data Status register (30007-
30008, bit 4) is set.
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