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Update PoE warnings (#287)

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* Update PoE warnings
This commit is contained in:
Christian Ehlers
2020-06-29 21:05:14 +02:00
committed by GitHub
parent 880ca88cdf
commit 1fac6f9a27
2 changed files with 58 additions and 13 deletions
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.gitignore vendored
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@@ -14,3 +14,4 @@ static/gitbook/.DS_Store
static/gitbook/assets/.DS_Store static/gitbook/assets/.DS_Store
static/gitbook/assets/pybytes/.DS_Store static/gitbook/assets/pybytes/.DS_Store
scripts/githubToken.json scripts/githubToken.json
.project

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content/tutorials/all/PoE.md
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@@ -6,17 +6,61 @@ aliases:
- chapter/tutorials/all/PoE - chapter/tutorials/all/PoE
--- ---
The PyEthernet module has onboard Power over Ethernet (PoE) power supply. This means that you can power your hardware with only an ethernet cable coming from a power injector. However, since the PoE is non-isolated, you must adhere to the following warning!
WARNING:
PoE power supply of PyEthernet module has no galvanic isolation. This means, that in accordance with
IEEE 802.3-2005 standard you must make sure that when powered from PoE power injector there are no other external connections to any part of the module or other hardware where it is installed. Such as USB cable, serial to USB bridge, logic analyser, an oscilloscope, etc.
As in certain hardware configurations it can lead to unrecoverable damage of not only the PyEthernet module but all hardware connected to it.
Be aware - violation of that requirement voids Pycom warranty.
The use of battery with PoE is allowed.
![](/gitbook/assets/PoE-NI.png) ![](/gitbook/assets/PoE-NI.png)
The PyEthernet module offers an optional onboard Power over Ethernet (PoE) power supply circuit. This means that you can power your hardware with only an ethernet cable coming from a power injector or PoE enabled Ethernet switch. However, since the PoE is non-isolated, you must adhere to the following warning!
{{% hint style="danger" %}}
WARNING: Before you use the PoE adapter for the first time, please make sure you read and follow the below instructions as failure to do so might damanage your devices!
{{% /hint %}}
The PoE power supply integrated in the PyEthernet module has no galvanic isolation. This means that in accordance with
IEEE 802.3-2005 standard, you must <b>NOT</b> connect any other devices / cables / chargers if the GND connection is connected to mains earth!
This is typically the case with PCs, Oscilloscopes, Logic Analysers, current consumption measurement devices etc.
Incorrect usages of Power over Ethernet can lead to unrecoverable damage of not only the PyEthernet module but all hardware connected to it.
A battery can be connected to the PyGate without issues. The battery can be charged via both USB-C and PoE power.
<h3>Setup Options</h3>
<table >
<tbody>
<tr>
<td> <b>Connectivity option</b></td>
<td> <b>Power over Ethernet</b></td>
<td> <b>Power over USB-C / external supply</b></td>
</tr>
<tr>
<td> USB-C cable connected to a PC <b>with</b> mains ground protection</td>
<td> <b>NOT OK</b></td>
<td> <b>OK</b></td>
</tr>
<tr>
<td> USB-C cable connected to a Notebook <b>without</b> mains ground protection</td>
<td> <b>OK</b></td>
<td> <b>OK</b></td>
</tr>
<tr>
<td> USB-C charger <b>with</b> mains ground protection</td>
<td> <b>NOT OK</b></td>
<td> <b>OK</b></td>
</tr>
<tr>
<td> USB-C charger <b>without</b> mains ground protection</td>
<td> <b>OK</b></td>
<td> <b>OK</b></td>
</tr>
<tr>
<td> Oscilloscope / Logic Analyser / Other equipment <b>with</b> mains ground protection</td>
<td> <b>NOT OK</b></td>
<td> <b>OK</b></td>
</tr>
<tr>
<td> Battery</td>
<td> <b>OK</b></td>
<td> <b>OK</b></td>
</tr>
</tbody>
</table>