MPDU User Manual
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address code on Device Manage page;
2)
The Master unit collects the data from the SER port through the RS-485 serial communication cable.
Please refer to the
《
MPDU MODBUS RTU Protocol Guide
》
for details.
5.4.4 Serial Connection settings
(
Optional
)
The Modbus-RTU protocol is used here for the Star connection, The MODBUS Serial Server connect to
the IN port from the first MPDU. Daisy-chain cable connect the first MPDU OUT port to the IN port of
the second MPDU. Connect all 32 Slave unit by the same way (see Figure above)Serial connection can
support up to 32 PDUs together. See figure as below.
MPDU1 MPDU2 MPDU3 MPDU32
Serial connection settings:
1)
Log on to Web interface of each MPDU to configure the serial communication code from the Modbus
address code on Device Manage page;
2)
The Slave1 unit collects the data from the IN port through the RS-485 serial communication cable.
Please refer to the
《
MPDU MODBUS RTU Protocol Guide
》
for details.
Note: This function is disabled by default and user may enable it by accessing the Web UI according to
6.2.1-C. Once the function is enabled, Ethernet Daisy-Chain as 5.4.1 will no longer be available.
5.5 RJ45 terminal PIN instruction of RS485 port.
Slave1
MODBUS
Serial Server
........
........
........
Slave2
Slave3
Slave32
........