STEP 6: CONNECTING STEP AND DIRECTION SIGNALS
CN2 PIN 1
Signal GND
This pin is optional. This pin must connect to the controller ground terminal if the drive's FAULT and FULL-
STEP outputs are going to be used; otherwise it can be left unconnected.
CN2 PIN 2
Step
This input pin connects to the controller's STEP output. The input accepts 3.3V and 5V logic level signals; if
3.3V logic is used, a 3.3VDC supply voltage from the controller must be connected to Pin 4. The maximum
step pulse frequency is 2.5 MHz, the minimum logic '0' time is 200ns and the minimum logic '1' time is
200ns. The STEP input current is -2.5 mA with 3.3V logic and -5 mA when 5V logic is used. Stepping occurs
on the positive going edge of the STEP input.
CN2 PIN 3
Direction
This input pin connects to the controller's DIRECTION output. The input accepts 3.3V and 5V logic level
signals; if 3.3V logic is used, a 3.3VDC supply voltage from the controller must be connected to Pin 4. The
minimum setup time is 0ns and the minimum hold time is 500ns. The DIRECTION input current is -2.5mA
with 3.3V logic and -5mA when 5V logic is used.
CN2 PIN 4
Common
This pin connects to the controller's +5VDC supply terminal if 5V logic is used or a +3.3VDC supply terminal
if 3.3V logic signals are used. The maximum current draw from the supply is 15mA at +5VDC or 8mA at
+3.3VDC. The absolute maximum voltage limits to this pin is -0.3VDC and +6VDC.
UNDERSTANDING INPUTS: STEP, DIRECTION, COMMON, RESET, AND ENABLE
All control inputs on the GR214V are optoisolated for protection. The user may c3.3VDC or +5VDC to control supply
inputs and the maximum current draw will be 15mA on all inputs. An explanation for each input is below:
RESET: This pin is optional. This pin connects to the controller's RESET output; otherwise it can be left unconnected. A logic '1'
on this pin allows the drive to run the motor if the ENABLE input is a logic '1' or unconnected. A logic '0' resets the drive's
internal microstep counter to zero, phase A 'off' and phase B 'on'. The RESET input should be used if it's necessary to have an
emergency stop input. Cycling the RESET input (hold at logic '0' for one second, then at logic '1') also clears latched fault
conditions such as short-circuit and over-temperature protection provided the triggering cause has been cleared. If no latched
faults exist, the minimum RESET logic '0' time is 20us.
ENABLE: Freewheels motor and stops all motor switching when a logic '0' is applied. The motor will have no holding torque and
can be manually manipulated. Upon a logic ‘1’ being applied the GR214V will move the motor to the nearest full step location.
If this input is left floating the drive will operate normally and respond to STEP and DIRECTION commands. This input can be
changed at any time to freewheel the motor and is not latched to any other input or output.
STEP: A step pulse frequency is applied to this input to move the motor. The frequency and speed will depend on the microstep
resolution chosen. The maximum frequency input is 2.5 MHz, allowing for a maximum speed of 2,929 RPM at the highest
resolution of the GR214V.
DIRECTION: When a logic ‘0’ is applied the GR214V will move clockwise. When a logic ‘1’ is applied the GR214V will move
counter clockwise. This input is a non-latching input and must be held at the desired logic level for as long as the motor must
move that direction.
UNDERSTANDING OUTPUTS: FULLSTEP AND FAULT
