Alphasense OPC-R1 - Page 27

072-0500 Alphasense User Manual
OPC-R1 Optical Particle Counter Issue 1
Alphasense Ltd Page 27 of 33 February 2019
Sensor Technology House, 300 Avenue West, Skyline 120, Great Notley. Essex.CM77 7AA. UK
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Email: sensors@alphasense.com - Web: www.alphasense.com
7. Re-establish
communications with the
OPC using the OPC
software, this will confirm
that the new firmware file
has been installed correctly
and is ready for use.
8. Press Ctrl+R to check that
the displayed config data is
upto date and also that the
laser DAC settings are
returned to the original
setting. See the main
section of the manual for
information on setting
EEPROM configuration.
Appendix D: Summary of firmware commands
OPC-R1 SPI functions (from point of view of SPI Master system) for firmware versions 2.01-2.21.
Function
Command
byte
Byte(s) out
Byte(s) in (0xF3 is set as
standard initial return byte
value from OPC-R1)
Notes
Peripheral/fan
power ON/OFF
0x03
0x03 0x31 Suggest that 10 ms be used as
delay between command byte and
following byte.
0x03 0xF3
Option byte 0x03 Bit 0 of this byte corresponds to
peripheral (laser) power. Bit 1
corresponds to fan power. Bit value
= 1 for ON, 0 for OFF.
Digital pot Set
Laser Power
0x04
0x04 0x31 Suggest that 10 ms be used as
delay between command byte and
following byte.
0x04 0xF3
LaserDAC 0x04 LaserDAC is an unsigned 8bit
integer.
Set Bin Weighting
Index
0x05
0x05 0x31 Suggest that 10 ms be used as
delay between command byte and
following byte.
0x05 0xF3
BinWeightingIndex 0x05 BinWeightingIndex (0-10) is an
unsigned 8bit integer that
represents the index of the preset
bin weightings to use.