7
MG.10.P2.22 - VLT is a registered Danfoss trademark
Modbus RTU
Option Card
Baud Rate
and Parity
Settings
The Modbus RTU communication protocol
accesses the internal Danfoss FC protocol
within the VLT 6000 to control the drive through
serial communications. (The Modbus-to-FC
interface uses 9600 Baud, 8 Bits, Even Parity,
and 1 Stop Bit.)
The Modbus RTU option card has a 9-input
DIP switch for setting baud rate and parity (see
figure below). The option card generally uses
9600 baud rate with no parity. Set the switch
positions in accordance with the following
instructions.
• Set input switches 1-3 to ON to select 9600
baud rate.
• Set input switches 4 and 5 to ON to select
no parity.
9600 Baud Rate and No Parity Switch Settings
Switches 6-9 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.
For Modbus RTU networks operating at other
than 9600 baud and no parity, determine switch
positions from the tables provided below.
Baud Rate
SW1
SW2
SW3
300
OFF OFF OFF
1200 OFF
OFF
ON
2400
OFF ON OFF
4800 OFF
ON
ON
9600
ON ON ON
19200
ON OFF ON
Parity
SW4
SW5
None ON
ON
Odd OFF
ON
Even OFF
OFF
Optional Baud Rate and Parity Switch Settings
1
2
3
4
5
6
7
8
9
OFF
ON
PCB EDGE
O
F
F
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