Hello Ashok,
Check out our KSGL Family of products at http://www.kalkitech.com/substationgateway.htm. The KSGL/S the smallest in the family has 2 Serial Ports, 1 Ethernet Port and supports Modbus RTU/TCP, IEC 101,103,104,DNP3 Serial, DNP3 Network, ABB SPA, DLMS Client and IEC 61850. The KSGL Family product pricing starts at USD 595/-.