A Survey of Industrial Internet of Things Platforms for Establishing Centralized Data-Acquisition Middleware: Categorization, Experiment, and Challenges

Table 2

Configuration settings in different communication methods.

	Wired communication	LTE communication
IIoT device	Welding machine
Interface to IIoT device	RS232 (serial communication)
Number of tags	15 EA
Protocol	Customized protocol
Network bridge	Used in RS232 to LAN converters
LAN speed	100 Mbps
Period of test	10 days
Hop count (network distance)	7	8 or more
Latency (ping test)	Under 1 ms	Under 80 ms
Number of devices	10 EA	4 EA
Total number of dataset	9,929,890	3,276,842