The SPRECON-E-T3 series was especially developed for low I/O numbers. The systems can be applied both as gateways and local RTUs with or without automation functions. The applied standard communication protocols are IEC 60870-5-104 (Ethernet) and IEC 60870-5-101. Optionally, all other protocols which are implemented into the SPRECON system family can be used (i. e. Modbus, measuring interface).