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Mesa setup page:
Configuration Tab:
Allows you to choose the firmware,
number of components / number of gpio,
frequency of pwm / pdm and the watchdog timeout.
The base frequency should be set as per the Mesa daughter
board you are using. Different boards require PDM vrs PWM
which is set on the connector tabs.
pick the firmware you wish to use and
you will see the component numbers change
default is to have all the available components active.
by choosing less of each component frees up gpio
press 'accept component changes' to have the connector
tabs reflect the changes
Any signalnames you had already pick will be lost unless
the component is the same as before the change.
Depending on the board chosen, the connector tabs will disapear
if not available.
Sanity checks are available for some boards - these just remind you to
check some settings that are specific for the choosen board.
The help page output tab will show the firmware PIN file,
which shows the default components, their channel number
and their Component number. The component number is useful for
changing some options such as stepper output pins to open drain.
For instance: in firmware SVST8_4 to change stepper channel
0 to open drain outputs, find out their component numbers.
step IO number = 48
direction number = 49
In your custom HAL file add the commands:
setp hm2_5i20.0.gpio.048.is_opendrain true
setp hm2_5i20.0.gpio.049.is_opendrain true
note that this says GPIO but the component number corresponds
to the stepper ouputs. See the manual for more options.
If you are using the 5i25 card with 2x7i77 or 2x7i76 firmware
but are only using one daughter board, deselecting half the components
(including half the sserial channels) will free up the extra
5i25 connector for GPIO, if desired.
Connector Tabs:
The available tabs are selected based on the
mesa card type.
The available component types are based on the
firmware / component number selected on the setup page.
The tabs will display the signal names and the component
types.
There are different pintypes depending on the components
available in the selected firmware:
GPIO - general purpose input / output
This is for general digital control.
If selecting mainboard GPIO, you can select the type
in the pintype combobox
This includes GPIOI - input, GPIOO - output, and
GPIOD - open drain output
The available signals will change if you switch between
GPIOI and GPIOO/GPIOD.
Sserial daugher boards GPIO type is not selectable.
In general, mainboard GPIO is updated faster then sserial GPIO.
ENCODER - a hardware base quadrature counter
You select the A phase signal and the rest of the
phases (B, I, and possibly M) are automatically included.
If using a single input or single input and index for the spindle
encoder, the encoder must be put in 'counter-mode'. This must be
manually added in a custom HAL file. For example (changing the board
name and encoder number to your requirements):
setp hm2_7i43.0.encoder.00.counter-mode 1
HAL file. See the Hostmot2 section on encoders for more info about
counter mode.
MUX ENCODER - a hardware base quadrature counter
You select the A phase signal and the rest of the
phases (B, I, and possibly M) are automatically included
Mux encoders allows two encoders per set of pins by using
a select pin to choose a second set of encoders. This
component is used with firmware that requires a special
daughter board from Mesa. Remember when connecting encoders
you must use the pinout for the daugher board.
RESOLVER - a resolver encoder counter
used with MESA 7i49 daughter board with special firmware
Some servos have resolvers rather then quadrature encoders
PWMGEN - a hardware base pulse width (or density)
modulation generator
You can select:
PWM -pulse width modulation using pulse and direction output pins
PWD -pulse density modulation
UDM -pulse width modulation using up and dowm output pins
you select the PULSE signal and the direction and enable
signals are automatically setup.
Please see the Mesa daughter board documentaion for the most up-to-date
recommendations for frequency and type. Here are the common ones:
The 7i33 daughter board requires PDM @ 6 MHz.
The 7i78 daughter board (for the 5i25) requires PDM @ 5 Mhz.
The 7i29,7i30,7i40 require PWM @ 20 KHz
the 7i48 and 7i49 require UDM @ 24 KHz
3 PWMGEN - special pwm generators used for driving brushless
servo motors 3 windings directly.
This is not fully supported yet so the HAl file will need
commands added to it to finish the config.
STEPGEN - a hardware based step and direction generator
only step and direction stepgens are supported
You select the STEP signal and the direction and enable
signals are automatically setup
If you wish to have a slave stepper for a tandem axis
select a master axis and a tandem axis.
The tandem axis will be connected to the master axis command signal and
will be set at all the same settings as the master axis stepper, so the
stepper/driver should match. There is no facility to align these steppers
while homing, the slave simpily follows the master's command.
POTENTIOMETER - A digital potentiometer used primaraly to control
a spindle found with sserial card combo 5i25/7i76
SSERIAL - smartserial daughter boards comunication stream.
allows connection to many daughter boards.
Currently PNCconf recognizes:
7i64 I/O board
7i69 I/O board
7i70 I/O board
7i71 I/O board
7i76 I/O board works only with the 5i25 main board
7i77 I/O board works only with the 5i25 main board
7i78 breakout board works only with the 5i25 main board
8i20 amplifier ( untested )
Linuxcnc supports 4 ports of 8 channels each of sserial
PNCconf only configures 5 channels of port 0 (so max 5 sserial boards -
note that some 5i25 daugther boards use some of the sserial channels
internally.)
Note that some daughter boards use multiple sserial channels.
You could change these options in a custom HAL file
If you wish to connect a component to something in a
custom HAL file write a unique signal name in the combo
entry box. Certain components will add endings to your
custom signal name.
Encoder will add < customname > +:
-position
-count
-velocity
-index-enable
-reset
Steppers add:
-enable
-counts
-position-cmd
-position-fb
-velocity-fb
PWM add:
-enable
-value
Signal selection:
By selecting signals you are configuring the input and output
of the mesa boards and selecting how pncconf displays options
in the upcoming pages.
PNCconf can configure servo motors, open loop steppers and
closed loop steppers.
PNCconf does a sanity check when you push the next button.
It checks for some obvious problems such as:
if you select a PWM signal for an axis PNCconf assumes you
are using a servo motor (except for the spindle)- then you
need to select an encoder signal too.
If you select an encoder you must select an PWM or a stepper
signal as well (except for a spindle)
A dialog will pop up letting you know of these detected errors.
PNCconf will not catch the error of setting two components
the same (If fact for GPIOO outputs this is fine anyways)
For testing purposes if you require an output true, for instance to force
a relay to close to allow the amplifier to be powered, select the
'force-pin-true' output signal. The openloop and tuning tests will then
set the output true for the length of the test.
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