Cyclohexane derivatives of Formula Ia and pharmaceutical compositions thereof that modulate the activity of the PGI2 receptor. The wireless sensors are configured to communicate with a base unit or repeater. In addition, the wireless drawing command receiving unit transmits drawing command throttle data back to the wireless drawing command transmitting unit to throttle transmission of drawing commands that are sent by the drawing command transmitting unit. Hash operations are performed on the certificate template to produce a certificate hash value, which is transformed from the platform.