ApexRp Operators Manual
63 248083480-1 Rev 3
Alarm and Threshold Registers
Alarm Enable Registers
The Alarm Enable input registers (43xxx series) are read/write. All
enable 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>
The 43xxx register series is used to determine which particle data
channels are set to ALARM ENABLE.
CHANNEL ENABLE (0=disable, 1=enable)
ALARM ENABLE (0=disable; 1=enable)
Table A-8 Alarm Enable/Disable Bits
These registers run in parallel with the data registers (30xxx series).
For example, data register 30010’s enable alarm register would be
43010. Data register 30016’s enable alarm register would be 43016.
To enable the Alarm for a particle channel, set the bit in the low word
of that channel. Because Bit-0 is reserved and must always be ON,
only Bit-1 will change for any channel alarm setting and Bit-0 must
always be written as a ’1’. What this means is that these registers will
receive a ’3’ to turn the setting ON and a ’1’ to turn it OFF.
Particle data registers for the Alarm Enable setting start at 43009 for
the high word and 43010 for the low word for channel 1.
Alarm Enable for Particle Channel 1
[high](smallest particle size starts here)
Alarm Enable for Particle Channel 1 [low]
Alarm Enable for Particle Channel 2 [high]
Alarm Enable for Particle Channel 2 [low]
Alarm Enable for Particle Channel 3 [high]
Alarm Enable for Particle Channel 3 [low]
Alarm Enable for Particle Channel 4 [high]
Alarm Enable for Particle Channel 4 [low]
Table A-9 Alarm Enable Registers
currently apply only to
ALARM enable/disable,
not to Channel
enable/disable.
currently only works for
Particle Channels. Any or
all channels and their
alarm thresholds can be
enabled and configured
independently of each
other.
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