Nokia 12 GSM MODULE REMOTE I/O - Manual (Page 18)

Figure 4. General settings
If you select the Disable acknowledgements option, only response messages to
acknowledgement messages are disabled. The following will not be disabled:
• Status messages; responses to input state or value queries
• Indication messages, for example, responses to timed commands (see
Chapter 9.3.7)
• Alarm messages; responses to alarm subscriptions (see Chapters 5.4 and
9.3.3)
• Error messages that are sent, for example, in response to a control
message with the correct message identifier and password, but with the
wrong command
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