# Connection Health

> A dashboard item that lists every device connection with its reads, failed reads, read time and last read, the connections not reading first.

Source: https://proxus.io/docs/analyze/dashboard-items/connection-health

The **Connection Health**  item shows how every device connection
reads now. Each device is a row with its Edge Gateway, protocol and tag count, its read time against the slowest
device, the share of reads that succeeded and how long ago it last read.

- **Header.** How many devices are reading, the share of all reads that succeeded, the median read time and the reads
  counted, then how many devices are not reading, have failed reads, are slow or are reading.
- **Row.** A device is **not reading** when its last read is older than the limit or it has none, has **failed reads**
  when under 99% of its reads succeeded, and is **slow** when its read time reaches the slow limit.

Devices that are not reading come first, then those with failed reads, then the slowest. Select a device to filter the
other items of the dashboard by it.

## Data fields

**Device** is required: one row per device. **Reads** counts every read cycle, the failed ones included, so the share
that succeeded is reads less failed reads over reads. Bind **Seconds since last read** with the **Min** summary.

## Settings

- **Not reading after (s)** is how old the last read may be before a device counts as not reading.
- **Slow from (ms)** is the read time from which a device counts as slow.

## Where to see it

The Meridian demo plant uses it on **Meridian · Connectivity Command Center**, with the read counters each Edge Gateway
keeps per device.

## Related

- [Read Time](https://proxus.io/docs/analyze/dashboard-items/read-time)
- [Tag Table](https://proxus.io/docs/analyze/dashboard-items/tag-table)
- [Proxus dashboard items](https://proxus.io/docs/analyze/dashboard-items)