UMAX0608XX‐1000. Tri‐Axial J1939 CAN Inclinometer. Version 9B
Page: 26-66
The J1939 CAN interface is presented by the
CAN Input Signal, CAN Output Message
and
J1939 Network
function blocks. The
CAN Input Signal
functional blocks are used to receive
CAN signals transmitted on the CAN bus. They have one signal output, which is updated once
the signal is received. The
CAN Output Message
function blocks are used to transmit CAN
signals on the CAN bus. Each CAN message can hold up to ten individual CAN output signals,
which receive data from ten signal inputs.
Configurable analog signal outputs are presented by three independent
Analog Signal Output
function blocks in AX061000.
In case the inclinometer data need to be processed before been output, the unit has ten
Binary
Function
blocks to do simple data conversion operations.
The inclinometer also has a
Global Parameters
function block containing four constant output
signals and other auxiliary output signals.
3.1 Function Block Signals
The inclinometer function blocks can contain signal inputs and outputs to communicate with
each other. Each signal input can be connected to any signal output using an appropriate
configuration parameter. There is no limitation on the number of signal inputs connected to a
signal output.
When a signal input is connected to a signal output, data from the signal output of one function
block is available on the signal input of another function block.
The function block signal data can have the following signal types:
{Undefined
,
Discrete
or
Continuous}
.
3.1.1 Undefined Signal
The
Undefined
signal type is used to present a no-signal condition in signal data or to specify
that the signal input is not connected (not used).
3.1.2 Discrete Signal
The
Discrete
signal type is used to present a discrete signal that has a finite number of states
in signal data or to specify that the signal input or output is communicating this type of signals.
The discrete signals are stored in four-byte unsigned integer variables that can present any
state value in the
0…0xFFFFFFFF
range.
3.1.3 Continuous Signal
The
Continuous
signal type presents continuous signals, usually physical parameters, in signal
data or as a signal input or output type.
The continuous signals are stored in floating-point variables. They are not normalized and
present data in the appropriate physical units. The user can do simple scaling of the
continuous signal data by changing
Scale (Resolution)
and
Offset
configuration parameters in
the appropriate function blocks.
