EMHXD Total Number of Devices

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The following list are generally recommended limits for how many devices should be associated to a single Leviton EMHXD logger.

• 31 total hardwired physical devices ("nodes") per RS485 port (62 total)
• 200 total devices per EMHXD (assumes ~100 datapoints per device)
• 1,024 datapoints maximum per device
• 20,000 datapoints maximum per system (200 x 100)
• 300 simultaneous incoming Modbus/TCP connections maximum

Additional factors that should be considered which may adjust the recommendations are the following:

• Logging rate
• Acceptable latency for the last device's data to be captured
• Baud rate
• Device response times
• # of separate Modbus register block(s) needed
• Frequency of communication errors
• Months/Years of offline data storage capacity
• # of configured logged data upload channels

Please see this article for more information on common product part numbers and their typical "load" on the system.