Danfoss VLT 6000 HVAC Series Design Manual page 159

Example - Index:
The first error code (index [1]) in parameter 615 Error
code must be read.
PKE = 1267 Hex (read parameter 615 Error code).
IND = 0001 Hex - Index no. 1.
The frequency converter will respond in the para-me-
ter value (PWE) block by means of an error code with
a value from 1-99. See List of warnings and alarms to
identify the error code.
Parameter value (PWE)
The parameter value block consists of 2 words (4
bytes) and its value depends on the command given
(AK). If the master enquires about a parameter value,
the PWE block contains no value.
If a parameter value is to be changed by the master
(write), the new value is entered in the PWE block and
sent to the slave
If the slave responds to a parameter requirement (read
command), the present parameter value is transferred
in the PWE block and returned to the master.
If a parameter does not contain a numerical value, but
several data selection options, e.g. parameter 001
Language, where [0] is English and [1] is Danish, the
data value is selected by writing the value in the PWE
block. See example on the following page.
Via the serial communication it is only possible to read
parameters with data type 9 (text string). In VLT 6000
HVAC, parameters 621-631 Nameplate data have data
type 9. For example, it is possible in parameter 621
Unit type to read the unit size and mains voltage range.
When a text string is transferred (read), the telegram
length is variable, since the texts have different
lengths. The telegram length is stated in the 2nd byte
of the telegram, called LGE.
In order to read a text via the PWE block, the para-
meter command (AK) must be set to 'F' Hex.
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VLT 6000 HVAC Series
The index character is used to indicate whether the
command in question is a read or write command. For
a read command, the index must have the following
format:
VLT 6000 HVAC has two parameters for which a text
can be written: parameters 533 and 534 Display text,
see the description of these under the parameter de-
scription. In order to write a text via the PWE block, the
parameter command (AK) must be set to 'F' Hex.
For a write command, the index must have the follow-
ing format:
Data types supported by the VLT frequency converter
Datatype
3
4
5
6
7
9
Unsigned means there is no sign included in the tele-
gram.
Description
Integer 16
Integer 32
Unsigned 8
Unsigned 61
Unsigned 32
Text string
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