Power Electronics SD700 Series - Page 44

SD700 – TOUCH-GRAPHIC DISPLAY
POWER ELECTRONICS
42
SMS SERVICE
3.1.1. Query Messages
This type of messages consists of a group of parameters associated to the query name (text
label). When the user sends a SMS message to the graphic display with the query name, the
graphic display will verify the user has the corresponding right or permission, collect the values
from the associated parameters, arrange the response message and send it back to the user
through SMS.
Query messages can be periodic with a configurable period between 1 and 24 hours. For
example, the user selects a periodicity of 10 hours for a query. When the user sends this query
name to the graphic display through SMS, this periodic query is activated. The first response
received by him is a regular response (the same one when query is non-periodic) sent by the
display. But as this query has assigned to it a periodicity of 10 hours, the graphic display sends
user the same response with the updated values of the associated parameters every 10 hours
from the activation moment. The query is deactivated when the user send the query name to the
display through SMS again. In that moment, the user receives the last response by the display
with the updated variable values.
Another question to be considered in normal operation is when another registered user (user
which did not activate the periodic query before) sends a SMS with the query name while this
query is activated. The second user will receive the first response in that moment, and from that
moment on, he will receive the following responses every 10 hours based on the time in which the
first user activated the query. The operation is the same in case of more users requests this
query. Finally, the query will be deactivated by the last one of the users that sends a SMS with the
query name again.
In summary, the periodic query is activated when one of the registered users sends to the display
a SMS with the query name. In that moment, the display sends to the user the first response, and
from that moment on, the display will send to all users (to the first user that activated the query
and to the remaining users that have been added to the query after the first user activated it) a
response every period set in the query from the activation moment. Finally, the query will be
deactivated by the last one of the users that sends a SMS with the query name again.
To understand better the operation of the periodic queries, see the example of section ‘3.4.2.
Example for Query Messages’.
The user should configure the query before using it. The user can create as many query
messages as he wants. The number of the query messages is limited by the storage space.
In order to create a query, the user should configure the following attributes:
 Query name: The query name sent by the user to the graphic display through SMS.
 Query help text: The text the user wants to receive when requesting ‘help’ or information
about the query.
 Periodic check box: To select the periodicity attribute for the query.
 Period in hours: In case of selecting the periodicity attribute, the period should be set here.
The allowed value range is from 1 to 24 hours.
 Variable list: Each variable represents a drive parameter. For each variable the user should
define the following attributes:
o Drive parameter associated: The drive parameter, the value of which will be read.
o Short name: A very short name to identify the read parameter. This is due to the SMS is
just 160 characters long.
o Help text: The text the user wants to receive when requesting help about the variable.
The response format for the query is the next:
<HEADER>. <QUERY NAME>
<ALIAS VARIABLE 1>=<VALUE 1>
…
<ALIAS VARIABLE N>=<VALUE N>
For additional information about how to configure a query message, see section ‘3.3.4. Query
Configuration’.