7
VLT is a registered Danfoss trade mark MG.10.P2.22
Modbus
RTU Option
Card Baud
Rate and
Parity
Settings
The Modbus communication protocol accesses
the internal VLT Danfoss FC protocol to control
the drive through serial communications. The
Modbus-to-FC interface uses 9600 Baud, 8
Bits, Even Parity, 1 Stop Bit.
The Modbus option card has a baud rate and
parity 8-input dip switch. For Modbus
networks operating with Modbus-to-FC
properties, set switch positions in accordance
with the following instructions. For Modbus
networks operating at other than with
Modbus-to-FC properties, determine switch
positions from the tables provided below.
Baud Rate and Parity Switch
• Ensure that inputs 1-3 are set to ON (default
setting) to select the 9600 baud rate.
• Ensure that inputs 4 and 5 are set to ON
(default setting) to select even parity.
Switches 6-8 are unassigned reserved
switches. Their setting does not matter.
NOTE
Set baud rate and parity switch
settings prior to installing Modbus
RTU option card for ease of
access.
21 345678
ON
ON
OFF
Baud
Rate
SW1 SW2 SW3 Parity SW4 SW5
300 OFF OFF OFF N ON X
1200 OFF OFF ON O OFF ON
2400 OFF ON OFF E OFF OFF
4800 OFF ON ON
9600 ON OFF OFF
19200 ON OFF ON
9600 ON ON OFF
9600 ON ON ON
Communication Baud Rate Parity Reserved
Configuration SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
Default
9600, 8N ON ON ON ON ON N/A N/A N/A
4800, 8O OFF ON ON OFF ON N/A N/A N/A
19200, 8E ON OFF ON OFF OFF N/A N/A N/A
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