SY A3-P3-O4 with Communication Modules DIP RoHS is a communication module manufactured by Sunyuan. It is an electronic module with 12 pins that is made up of a base board and a DIP socket. It is RoHS compliant and has four ports which support RS-485 communication. It supports data transmission rates of up to 115200bps and has 4KV high voltage protection, over-load, surge and ESD protection, and operating temperature range of -20~+85 Celsius. With this module, users can remotely control their devices over long distances.