25/01/2010: IP Relay ER02a HW GroupThe IP Relay ER02a is a RS232/RS485 serial line converter with two 230V-rated SPDT relays. The contacts and the serial line can be controlled using the free HW VSP (virtual serial port) software, or using the documented M2M protocol. The communication protocol is based on Telnet and RFC2217 extensions.
The HWg SDK gives examples, in several programming languages, of using IP Relay in your software and applications.