Liebert UPS System user manual RS232 Serial Port

Chapter 3 Electrical Assemble

2.Connection of serial connection cables

The monitoring board ULW2L61U2 is shown in Figure 3-8, where the locations of RS232, RS485 and input and output contacts are marked. The user can connect the cables with reference to this board.

communication cable RS485-

communication cable RS485+

D.C.Aforgenerator D.C.Bforgenerator EmergencystopA EmergencystopB +24Vpowersource D.C.for24V environmentvalue D.C.for24V environmentvalue D.C.for24V environmentvalue +12Vpowersource D.C.for12V environmentvalue Ambient temperatureinput powersourceforsensor batterytemperature groundofsensor N.Cforbatterylowalarm C.C.forbatterylowalarm N.O.forbatterylowalarm N.C.forbatterypower C.C.forbatterypower N.O.forbatterypower N.C.forinverterpower C.C.forinverterpower N.C.forinverterpower N.C.forambientover temperature C.C.forambientover temperature N.O.forambientover temperature N.C.foremergentstop C.C.foremergentstop N.O.foremergentstop N.C.forcommonalarm C.C.forcommonalarm N.O.forcommonalarm N.C.foroverload C.C.foroverload N.O.foroverload N.C.forgeneratorpower C.C.forgeneratorpower N.O.forgeneratorpower

Fig. 3-8 Monitoring Board ULW2L61U2

The length of the serial communication cables is different according to actual conditions. The cables are not supplied with the UPS.

The communication modes of RS232, RS485, modem and SNMP can be used together, but only one mode can be used at any time.

1) RS232 Connection

The J20 is the RS232 communication port. One end of the communication cables should be connected to J20 and the other end should be connected to background monitoring equipment. The meaning of each pin is shown in Figure 3-9.

Pin 2：receiving	Pin 3：Transmitting	Pin 5：Ground	Other pins：Void
	Fig. 3-9 RS232	Serial Port

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