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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.
RS485
D-
Communication Parameters
Baud Rate
Data Bits
Stop Bits
Parity
Flow Control
Communication Type
DEFAULT
38
The RS485 differential 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)
D+
Middle Pin is the reference potential used by the transceiver to measure the
D+ and D- voltages.
2400
8
1
No Parity
No Flow Control
RTU
Table.12
MODBUS END
MODBUS END JUMPER (J4):
If the UPS is connected at
the end of the bus line ; the
jumper should be configured
as described.
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