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- Master device: Among the devices that are connected through RS-485, the device that plays the role of a controller. It processes data by periodically monitoring the slave device. It is also called a host device.
- Matching timeout: The time limit given to device matching or server matching. Matching fails if the matching does not get completed within the time limit.
- Message timeout: The duration of time a message is displayed when there is no user interaction.
- MSB (Most Significant Bit): The bit at the highest position of binary data (the left-most bit) or its content. It is the opposite of the Least Significant Bit (LSB).
- MTU (Maximum Transmission Unit): The maximum amount of packets that can be transmitted through the network.
- Muster Zone: A zone designated for the gathering of members in case of an emergency such as a fire. This is used to monitor the number and roster of personnel in a certain zone, and to notify administrators via an alarm or alert if a user has remained in a particular zone for a certain period of time.