Lighthouse REMOTE Liquid Particle Counter (MODBUS Output) Operating Manual
7-6
248083227-1 Rev 8
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. See Table 7-5.
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.
Note:
Alarm Enable
currently only works for
Particle Channels.
To enable the Alarm for a particle channel, set the bit in the low word
of the channel. Only one particle channel can be enabled at a time.
Whichever channel is enabled last will be the channel that the alarm
threshold will apply to.
Particle data registers for the Alarm Enable setting start at 43009 for
the high word and 43010 for the low word for channel 1. See Table 7-6.
Table 7-5 Alarm Enable/Disable Bits
Bit
Description
0
RESERVED
1
ALARM ENABLE (0=disable; 1=enable)
2
RESERVED
Table 7-6 Alarm Enable Registers
Register Data
Type
Description
43009
unsigned int Alarm Enable for Particle Channel 1 [high]
(smallest particle size starts here)
43010
unsigned int Alarm Enable for Particle Channel 1 [low]
43011
unsigned int Alarm Enable for Particle Channel 2 [high]
43012
unsigned int Alarm Enable for Particle Channel 2 [low]
43013
unsigned int Alarm Enable for Particle Channel 3 [high]
43014
unsigned int Alarm Enable for Particle Channel 3 [low]
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