We have successfully tested and validated the bidirectional communication links (forward and reversed) for our implant SOC and system designed for the restoration of motor functions for the spinal cord injury (SCI). The stimulation commands are issued via forward link(cyan trace) while the response to the commands is digitally transmitted and received by the customized Graphic Interface Unit (GUI) via the reversed link (green trace). The command is capable of simultaneously targeting various spinal cord segments and thus the corresponding muscles at the lower limbs by different set of waveform parameters, including frequency, skew, duration, amplitude, phase, etc. (yellow and pink traces). This is a critical step toward the realization of a closed-loop system for SCI applications.