The BK Precision TL983P 3-Phase Sync Adapter for 9830B Series enables three of the same models of the 9830B Series to be connected in a mast-slave configuration to provide three-phase power. The TL983P adapter connects to the Digital I/O connector on the rear of the AC source. Standard RJ45 communication cables (sold separately) connect each adapter to route the 3-phase synchronization signal from the master to the slave units.