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9M02-8978-A002-EN
Version 14
Safe-E-
Stop™
User Guide
3.2.2 Radio Interference
Signals from other RF-emitting sources might interfere with the radio communication between the MSD
and PSD. If the radio link reliability is affected by interference, changing the RF channel or even the RF
band may be necessary.
3.3 Telegram Security
The transmitted telegram contains several security features.
3.3.1 Frame Type
Each message has an 8-bit message type identifier that is unique to the equipment in use.
3.3.2 System Address
Your Personal Safety System uses 32,768 unique Master Addresses, and 15 Sub Addresses per MSD
(one per each possible associated PSD).
This system address is contained in every telegram sent between the MSD and PSD. The data is
considered valid only when the address combination matches. This is a safety measure to ensure that the
MSD will act only upon its assigned PSDs.
3.3.3 CRC
The telegram is checked for integrity by the use of a 16-bit CRC. Frames containing a mismatched CRC
will be rejected.
3.3.4 Frame Counter
Each message has an embedded frame counter that changes with every data frame. This prevents
frozen data and data frame hacking.