The camera port on the EZ-B IoTiny is specifically designed for the camera connection and cannot be used for two-way serial communications. The IoTiny does support serial communication, but it is limited to transmit only (one-way). Each digital port on the IoTiny can transmit serial data. However, they do not support receiving data, making the communication one-way. For more detailed information, you can refer to the EZ-B IoTiny documentation in the support section on the Synthiam website.