Installation guide

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3. Configuration
3.1.1 DIP Switches
3.1.2 SW1 – Modbus Address
Use unique addresses: assign a unique Modbus slave address to each Modbus Slave device on the net-
work. Although Modbus allows for Modbus slave addresses from 1 to 247, you can still only connect 32 unit
loads (including the PV Plant PC).
The following table specifies the MODBUS addresses.
Address
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
1
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
2
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
6
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
8
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
16
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
32
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
64
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
128
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
3.1.3 SW2 – Data Speed, Parity and Read/Write Lock
On/Off
Bit 1
Bit 2
Bit 3
Bit 4
ON
9600 bps
Read/Write Locked
Even Parity
Not Used
OFF
19200 bps
Read/Write Allowed
Odd Parity
Not Used
All devices on the RS485 network must use the same bit rate and parity. Read/Write should always be
locked. One stop bit and 8 data bits are standard for Modbus RTU.