Class-8 Heavy Truck Duty Cycle Project Final Report - Center for ...

e) Alter the id, mask, value, etc. as necessary. Descriptions of
these values follow.
NOTE: The length of the mask must be the same as the
length of the value or the eDAQ will crash.
4) When finished click Save File and close the web browser. The
database will be listed as a configuration option the next time the
hardware is queried.
General Explanation of Database Setup
id – the eDAQ’s 12-character identification; may include a-z, A-Z, 0-9,
and _, but must start with a letter
interface – should be the appropriate connection depending on what is
used; for example:
VBOX CAN
AirWeigh J1708
mask – often 0x87FF; keep previous values if adding a row; if starting
“from scratch” (as with AirWeigh), the use of 0xFFFF is
recommended; this value must be the same length as the value
value – identifies which “row” in the data stream (view data in text file)
is being used for the data; first four hexadecimal characters (e.g.,
0x0301 for some VBOX parameters, 0xE1FE for some AirWeigh
parameters, etc.)
description – a brief description assigned to the channel, up to 64
characters
bitpos – the starting bit for the data
bitlength – the number of bits assigned to that data
units – the units that will be displayed for the value
offset – the offset value for the data; often 0
scale – the number the data sent must be multiplied by in order to get
the value that the data represents
min – the minimum value that data will represent
max – the maximum value that data will represent
dataformat – options: signed most significant byte (MSB), unsigned
most significant byte (UMSB), signed least significant byte (SLSB),
unsigned least significant byte (ULSB)
request – the message sent by the eDAQ to request specified
information from the instrument, usually in the format 0xAC____;
D-70