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VECTORDRIVE DSV 5444
Top technology in drive electronics
07.07.04 10:12
Dietz-electronic
page 45 of 60
8.4.2
"B2 mode" short message operation
For communication with higher ranking control systems, the VECTORDRIVE DSV 5444 frequency inverter
has a high performance protocol. In contrast to dialogue operation, there is no clear text message exchange,
only short protocol units. The short message commands are identical to those of the terminal program. In
answer to a command, the inverter transmits the acknowledgment sign "*", if the command has been properly
executed. For certain commands, the acknowledgment sign is followed by a status message in round brack-
ets, e.g. "(Z20)".
Messages consist of three characters, apart from the "W" command.
Number values transferred as ASCII characters must be made up with blanks. The commands have the
same functions as in dialogue operation. Short message operation presupposes that the inverter is ready for
operation.
8.4.2.1 Communication
time-frame
For transmission, a time-lag must be maintained between the individual short message commands before the
next command is transmitted to allow for internal processing of the command.
Without synchronous control
with synchronous control
Operating mode
3ms
5ms
RS232
12ms
20ms
RS485
5ms
10ms
RS485 im „B5“ broadcast mode
With communication via an RS485 interface, an interval of 0.5 ms must be maintained between two strings.
8.4.2.2
Short message commands
The protocol units which the control system sends to the VECTORDRIVE DSV 5444 are commands. They
must have the following syntax:
Syntax
Meaning
|
„or“
[ 09]
"Blank or ASCII character 0 to 9"
{exp}n
"n-times repetition of exp"
<CR>
"ASCII 13" or "Carriage Return"
dddddd
16-bit decimal number as ASCII characters
xxxx
16-bit hexadecimal number as ASCII characters
yyyy
16-bit hexadecimal number as ASCII characters
number_31
31-bit decimal number as ASCII characters
[
Aaddress
]command[=][value]<CR>
with following substitutions:
address
= 00 | 01 | 02 | ... | 99
value = {[ 09]}5 | {[ 09]}6 | {[ 09AFaf]}4
8.4.2.3
Short message mode commands and messages
In response to the commands, the VECTORDRIVE DSV 5444 transmits messages in round brackets. Apart
from the "W" command, messages consist of three places. In the command program, a message can
contain a maximum of 239 characters. Only alphanumeric characters are allowed. Round brackets "(" and ")",
diaereses and symbols such as "STRG+d" are not allowed inside messages. For example:
:20<CR>
(clear text)<CR>
If a block is started with Wnumber<CR>, the inverter executes a message contained in this as clear text on
the interface. This is useful for troubleshooting, for example. VECTORDRIVE DSV 5444 inverters connected
to an RS485 bus ignore these messages.
A<
CR
>
Disconnects control.