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6. Modbus Interface Board Configuration
The Modbus interface board uses an 8-position DIP switch (labeled SW1) to configure
the network communication characteristics. The switch settings are only read during
initialization, so if a change is made to any of the switches on SW1, the inverter must
be reset in order to enable the new settings. The various configuration settings of
SW1 are as follows:
Communication Method:
SW1 #
1
OFF
Modbus RTU
ON
Modbus ASCII
Baud Rate:
SW1 #
4
3
2
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
Parity:
SW1 #
6
5
OFF
OFF
even parity
OFF
ON
odd parity
ON
OFF
no parity (2 stop bits)
ON
ON
no parity (1 stop bit) - applies only to RTU mode
Protocol:
SW1 #
8
OFF
Modicon Modbus
ON
DO NOT SELECT (reserved for future expansion)
SW1 #7 is not used and its setting is therefore irrelevant.
Additionally, a jumper on the interface board (labeled JP1) sets whether or not the
Modbus network is terminated at the interface board (termination is 121Ω resistor).
Only the 2 devices at the extreme ends of the Modbus network should have JP1 set to
"TERM". All other devices should have JP1 set to "OPEN".
Function
Function
300 baud
600 baud
1200 baud
2400 baud
4800 baud
9600 baud
19.2 kbaud
38.4 kbaud
Function
Function
14
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