Siemens SIMATIC LOGO! CMR2020 Operating Instructions Manual page 120

Operation
7.3 SMS message structures and examples
The following conventions apply to queries and write access:
● The keywords must always be in uppercase letters.
● With write access, the "?" character is omitted after the keyword. You need to start with a
password:
– Write access: <password>;<keyword>=<parameters>
– Read access: <keyword>?<possibly parameters>
The CMR checks the text of the SMS message for keywords or with write SMS commands
first for the password specified in the configuration:
● If the SMS message does not contain any keywords or no or an incorrect password an
entry is made in the diagnostics buffer.
– If the SMS message comes from an authorized phone number, a reply SMS message
– Exception: If the SMS message comes from an unauthorized phone number or "Allow
Password configuration for SMS messages with write access
Note
No ";" in the password
• The password must not contain ";".
• The password must be separated from the keyword with a ";".
All SMS messages with write access must be preceded by a password:
● You configure this password using the WBM.
The password counts as the authorization of the user and prevents manipulation of
LOGO! BM or LOGO! CMR values.
Replying to SMS messages
SMS messages from authorized users are replied to by the CMR. With write access, this
reply consists of a positive or negative acknowledgement of the write procedure.
Note
Preventing an SMS message loop with linked CMRs
To avoid several CMRs connected by mobile wireless forming an SMS loop,
acknowledgement frames are received but are not replied to.
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is always sent.
receipt of SMS messages" is deactivated, the SMS message is discarded.
LOGO! CMR2020 / LOGO! CMR2040
Operating Instructions, 09/2014, C79000-G8976-C356-01