You can find instructions on using the Jrk with the LACTxP linear actuators on the actuator’s product page. To control the Jrk with an Arduino, you should connect the Jrk’s ground and RX pins, and optionally its TX pin, to the Arduino appropriately. We do not have any example code for controlling the Jrk serially, but information on its serial protocol is in section 4 of its user’s guide.