Right side panel, [time code out] connector (xlr-3-32 type/balanced), [time code in] connector (xlr-3-31 type/balanced) – Fostex PD606 User Manual
Page 42: [adjust] lever, [analog input] connectors (xlr-3-31 type/balanced), 1 2 3 gnd hot cold, Outputs time code, Inputs external time code