Ablerex KRONOS Series Installation And Operation Manual page 30

 Communication Slot2
This slot can install Relay card or SNMP card. Please ensure the SW2 switch to
correct position when this slot is used.
 Batt. Temp.--External battery temperature connector
Connect to external battery temperature sensor. Please refer to section 5-4.
 RS-232
Pin Assignment:
Baud Rate
Data Length
Stop Bit
Parity
This port is available for change the setting of UPS by setting software.
 Paral-1&Paral-2
Parallel communication cables are required to connect UPS each other when UPSs
operation in parallel. Please refer to section 2-7for detail connections.
 H↔U—communication selector
This switch is to select HMI or USB port. Please ensure this switch on "H" position
for ensure HMI port is workable.

USB
This port is for service only.
 Switch—the switch for terminal resistor of parallel communication
To ensure good parallel communication quality, please set the switch of the two
farthest UPS to the "ON" position. Please refer to section 2-7 for detail.
 LED Status Indictors
Normal: The UPS is normal.
Alarm: The UPS has some abnormal conditions.
parallel communication port
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2  TX (OUT)
3RX (IN)
5Ground
57600bps
8 bits
1 bit
None