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11.8 Use of SMS messages
The setting up and the use of the SMS functions are described in
the installation and operating instructions for Dedicated Controls.
To find the parameter in the CU 36X, go to Settings >
Communication settings >
• SMS numbers
• SMS schedule
• SMS heartbeat message
• SMS authentication.
Apart from the SMS functionality described in the previous
sections which is related to the Dedicated Controls wastewater
system, the CIM 250 will send SMS messages in case of faults or
other special conditions of the CIM 250 itself.
Such messages do not depend on the CU 36X. They cannot be
disabled, but are generated by the CIM 250 and sent to all
numbers in the phone book.
The message is triggered by an event. If the CIM 250 is switched
off and on (the battery must also be removed), it will send the
message again if the cause of the message still exists.
11.8.1 No connection to product
If the communication between the CIM 250 and the CU 36X is
interrupted for more than one minute, the CIM 250 will send this
message to all numbers in the phone book.
[Installation name]
GSM Module Error:
No connection to product
11.8.2 No mains supply, using battery
If the CIM 250 detects that it is being supplied from the optional
CIM 250 battery, it will send this message to all numbers in the
phone book:
[Installation name]
GSM Module Error:
No mains supply, using battery
This fault may disappear by itself, as the message is typically
triggered by a short power cut. In case of this special fault (but
not the other ones), the CIM 250 will send a message, telling that
the fault has disappeared:
[Installation name]
GSM Module:
Mains supply returned
If the battery is worn out or the CIM 250 has no battery, the CIM
250 will not detect that the power supply to the CU 36X has been
interrupted, as it will loose power supply itself. Therefore, it
cannot send a message. To inform the user that there has been a
power cut, the CIM 250 will always send an SMS message when
the power supply has returned:
[Installation name]
GSM Module:
Power on occurred
11.8.3 Change GSM module battery
If the CIM 250 detects that the optional CIM 250 battery is worn
out and must be replaced, it will send this message to all
numbers in the phone book:
[Installation name]
GSM Module Error:
Change GSM Module battery
11.8.4 GSM module battery low
If the CIM 250 detects that the optional CIM 250 battery level is
low, it will send this message to all numbers in the phone book:
[Installation name]
GSM Module Error:
GSM Module battery low
11.9 GPRS connection
GPRS (General Packet Radio Service) is a wireless, "allways on"
connection that remains active as long as the CIM 250 is within
range of the service. With GPRS it is possible to establish a
wireless connection to the internet and thus enable a remote
connection to a SCADA system computer or another PC
application. Typical data rates are 32-48 kbit/s.
The GPRS itself takes care of the wireless data transfer via the
GSM network. It plays the same role as Ethernet in a wired
network. On top of GPRS is the TCP/IP protocol, which enables
easy integration with the internet. The Modbus TCP protocol is
used on the application layer communicating with a TCP port
number (default 502). The difference when compared to the
fieldbus protocol Modbus RTU is the exclusion of the 16-bit CRC
checksum and the adding of a Modbus application program
header as illustrated below.
11.9.1 Subscription
The GSM service providers have different technical solutions for
GPRS to choose from. You have to select the service provider
and the technical solution that best suit your needs, and it must
be based on static IP addressing. You will get the following from
the GSM service provider:
• A Subscriber Identity Module (SIM card).
• An Access Point Name (APN) (e.g. "internet").
• Username (is fixed and cannot be changed by the user).
• Password (is fixed and cannot be changed by the user).
• A static IP address.
Solutions based on a VPN (Virtual Private Network) involve the
use of special routers, e.g. GRE routers, Generic Routing
Encapsulation, which you will also get from the service provider.
Note
No SMS message will be sent if the phone book is
empty (for instance if the CIM 250 has not been
initialised).
Note
If the cause of the interruption is the fact that the
power supply to the product was interrupted, the CIM
250 will send this message instead: No mains supply,
using battery. See below.
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