PoKeys Pulse engine v2 documentation
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responses and high accuracy of positioning. MPG jogging uses encoder (MPG) values directly to feed
the internal motion controller with the up-to-date information on MPG position. This results in fast
responses of the machine to the MPG input.
Safety charge-pump output
When activated, 5 kHz square safety charge-pump signal is present on pin 53 if the Pulse engine is in
normal operating mode. The safety charge-pump in other operating mode can be enabled by the
user by selecting the ‘Enable charge-pump’ check boxes.
In Mach3 plugin, the user can select whether charge pump output is active during emergency.
Motor driver enable outputs
Motor driver enable outputs are available only with conjunction with PoKeysCNCaddon. User can
select modes in which the motor drivers are enabled by selecting the ‘Enable axis power’ check
boxes.
In Mach3 plugin, the motor driver enable outputs settings are joined with safety charge-pump
settings.
Axis parameters
Internal mode uses the following axis parameters of motion:
Maximum speed: maximum frequency of pulses (in pulses/s)
Acceleration: maximum acceleration (in pulses/s^2)
Deceleration: maximum deceleration (in pulses/s^2)
Limit and home switches configuration
Direction change configuration: direction can be changed separately for each of the axes
Homing direction configuration: direction of homing can be changed separately for each of
the axes
Custom external pulse generator without IO functionality
External pulse generator is a simple circuit for deserializing step and direction data, coming from
PoKeys device. The circuit uses 74HCT595 IC that is connected to PoKeys board as shown in the table
below.
Two 74HCT595 can be cascaded in order to support 8 axes, but single one can be used for up to 4
axes. When cascading, CLOCK and LATCH signals are shared between both ICs, while DATA out (pin 9)
of the first IC is used as DATA signal of the second IC.
Pin
Description
PoKeys56U
pin
PoKeys56E/57E
pin
5V
5 V power supply
5 V
5 V
GND
PoKeys ground
GND
GND
DATA
Signal for pulse generation
23
9
CLOCK
Signal for pulse generation
25
11
LATCH
Signal for pulse generation
26
51