MODBUS END JUMPER (J1):
If the UPS is connected at
the end of the bus line ; the
jumper should be congured as
described.
The RS485 dierential line consists of three pins:
• A is inverting pin (TxD-/RxD-)
• B is non-inverting pin (TxD+/RxD+)
• Middle Pin is reference pin (optional GND)
Middle Pin is the reference potential used by the
transceiver to measure the A and B voltages.
The B line is positive (compared to A) when the line is
idle.
8.4. 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.
RS485
RS485
AB
Communication Parameters
Baud Rate 2400
Data Bits 8
Stop Bits 1
Parity No Parity
Flow Control No Flow Control
Communication Type RTU
Table.12
DEFAULT MODBUS END
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