This article is to cover how many nodes, devices, and datapoints can be associated with a single EMH. This article is intended for the A7810, A8810, A8812 and A8814 model Leviton Energy Monitoring Hub dataloggers. For the newer models, please review this communities article for more details.
Definitions:
System Recommended or Hard Maximums:
When designing a system, the general recommendations we have for the dataloggers listed above are:
Common product part numbers and typical system load:
Definitions:
| Node: | A physical device on the RS485 daisy chain |
| Device: | A physical or virtual instance where device datapoints are made available for capture |
| Datapoint: | Any measurement or status parameter available to be read from a device |
System Recommended or Hard Maximums:
When designing a system, the general recommendations we have for the dataloggers listed above are:
- Up to 100 devices on the Device List from any of the following sources:
- RS485 Modbus
- Modbus TCP
- BACnet IP
- Up to 32 total nodes on any physical RS485 daisy chain
- 4000 total datapoints across all devices
- 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
Common product part numbers and typical system load:
| Model | Nodes | Devices | Datapoints |
| EMH A8810 | 1 | 0 | 0 |
| EMH A8812 | 1 | 1 | 46 |
| Flex I/O A8332 | 1 | 1 | 46 |
| High Density Pulse Module A8911 | 1 | 1 | 46 |
| ModHopper R9120 | 1 | 1 | 10 |
| EMH A7810 | 1 | 1 | 20 |
| Series 4000 | 1 | 1 | 37 |
| Series 4100 | 1 | 1 | 72 |
| Series 6000 | 1 | 1 | 64 |
| Series 7000/7100, 48 input version | 1 | 16 | 992 (62/device) |
| Series 7000/7100, 24 input version | 1 | 8 | 496 (62/device) |
| Series 7000/7100, 12 input version | 1 | 4 | 248 (62/device) |
| Series 7000/7100, 3 input version | 1 | 1 | 62 |
| Series 7200/7300 | 1 | 1 | 72 |
| Series 8000 | 1 | 1 | 313 |
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