What's New in V231 This document is current but may reference obsolete products.

Firmware version 321 (v321) for the ION 7550 / ION 7650 meter supports the following new features: * Enhanced Modbus Mastering capability * Time synchronization using Line Frequency * Advanced Meter Security (when using ION software) * ITC (Instrument Transformer Correction) for voltage and current phases * Real-time meter phasor diagnostics screens in ION Setup 2.1