30
MODBUS END JUMPER (J4):
If the UPS is at the end of the
bus; the jumper should be
moved to right side to close
the bus.
The RS485 dierential line consists of three pins:
• D+ is non-inverting pin (TxD+/RxD+)
• D- is inverting pin (TxD-/RxD-)
• Middle Pin is reference pin (optional GND)
Middle Pin is the reference potential used by the transceiver to measure the
D+ and D- voltages.
6.5. RS485
RS485 with MODBUS protocol is used in a wide range of automation systems for Industrial Process
monitoring or for Building Management Systems. This communication link allows monitoring UPS status
and measurements with such systems.
Communication Parameters
Baud Rate 2400
Data Bits 8
Stop Bits 1
Parity No Parity
Flow Control No Flow Control
Communication Type RTU
Table.7
DEFAULT MODBUS END
RS485
RS485
D+
D-
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