UMAX140610. LIN
– J1939 CAN Protocol Converter with PWM Output. Version 1
Page: 14-81
Name
Default Value
Range
Description
Lamp Set by Event in
DM1
0, Protect
Drop List
See Section 3.2.4 and 3.9
SPN for Event used in
DTC
520448 ($7F100)
1 to 524287 See Section 3.2.4 and 3.9
FMI for Event used in
DTC
0, Data Above
Normal-Most Severe
Drop List
See Section 3.2.4 and 3.9
Delay Before Sending
DM1
100 ms
0 to 60,000
ms
See Section 3.2.4 and 3.9
The converter has a PWM output which can be configured by the corresponding function
block. The
“Output Type”
setpoint determines what kind of signal the output produces.
Changing this parameter will update other parameters in the group to match the selected type.
For this reason, it should be the first parameter to be changed. The supported output types by
the controller are listed in the table below. By default, the PWM output is
configured as ‘
1,
Digital PWM
’ type.
Table 5. Output Type Options
Value
Meaning
0
Output Not Used
1
Digital PWM
2
Digital Frequency
4
Digital Mixed PWM and Frequency
5
Digital ON/OFF
The control signal of the output will have associated with it a minimum and maximum values.
Besides type ‘
Digital ON/OFF
’
, all the other output types are always responding in a linear
fashion to changes in the control source per the calculation in the figure below.
min
*
min
min
max
min
max
X
m
Y
a
X
X
Y
Y
m
a
mx
y
−
=
−
−
=
+
=
Figure 3. Linear Slope Calculations
Where X and Y are defined as:
Xmin = Control Input Minimum
Ymin =
“Output At Minimum Command”
Xmax = Control Input Maximum
Ymax =
“Output At Maximum Command”
In all cases, while the X-axis has the constraint that Xmin < Xmax, there is no such limitation on
the Y-axis. This allows for a negative slope so that as the control input signal increases, the
target output value decreases. Or it allows output to follow control signal inversely.
