44 Chapter 6 Communication
Liebert
®
ITA 5kVA And 6kVA UPS User Manual
Refer to the corresponding user manual for the installation and operation guide.
6.2.4 RS232 Card
RS232 card should be used together with Liebert
®
ITA series UPS of Emerson. It only supports RS232 protocol
communication, and the maximum length of communication cable cannot exceed 15 meters.
6.2.5 Dry Contact Card
Dry contact card provides the remote with four routes of relay digital signal output: UPS on Battery, Battery Low, UPS
on Bypass or in Standby, UPS Faulty. Each dry contact output provides both normally open and normally closed ports
for user. The dry contact card can also receive three routes digital signal inputs, two of which control the UPS turn-on
and turn-off respectively, the third is reserved.
Refer to the corresponding user manual for the installation and operation guide.
6.2.6 Extended Dry Contact Card
Besides the functions of the UPS dry contact card, the extended dry contact card provides RS232 and RS485
communication function to support the JBUS/MODBUS (RTU) communication protocol, and provides four routes
analog signal acquisition function.
Refer to the corresponding user manual
for the installation and operation guide.