0 communication, 1 db-9 connector, Table 4 db-9 pin assignment – Liebert UPS Systems PSI XR User Manual
Page 22: 2 remote shutdown via the db-9 connector, 1 any mode shutdown via pins 5 & 6, 2 battery mode shutdown via pins 4 & 5, Ommunication, Db-9 connector, Remote shutdown via the db-9 connector, Any mode shutdown via pins 5 & 6
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