MG.20.B6.02 – VLT is a registered Danfoss trademark
VLT
®
2000 Series
54
Serial data interface (group 5..)
Using the serial RS 232 port (terminals 71 and 72) you
can read and set parameters of the VLT frequency
converter and issue reference and control commands.
The serial port can be used for point-to-point commu-
nication between the VLT frequency converter and a
PC. Communication takes place by means of a
protocol specified by Danfoss, and using the echo
function (para. 500) you can connect several VLT
frequency converters.
The data format consists of 10 bits:
One start bit (logical 0)
Eight data bits
One stop bit (logical1)
The control possibilities of the VLT
Protocol:
The communication protocol for the VLT 2000 Series
consists of 22 ASCII characters. These characters
make it possible to operate, set and read parameters,
and to receive status feedback from the VLT
frequency converter.
The communication takes place in the following way:
The master sends a telegram to a VLT frequency
converter. Then the master awaits a reply from the
frequency converter before sending a new message.
The reply to the master resembles the telegram sent
by the master, but now contains any updated data
values and the status of the frequency converter.
Data format Telegram format
Set the baud rate (rate of transmission) in parameter
501 and the address of each unit in parameter 500.
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