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Hardware: Document important interfaces #67

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lategoodbye merged 1 commit into from
Sep 16, 2025
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Hardware: Document important interfaces #67

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38 changes: 38 additions & 0 deletions docs/source/hardware.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,13 @@ to build a DC charging station:
of emergencies.
* The high-voltage DC contactors for DC plus and minus rails.

*************************************
Control Pilot / Proximity Pilot (X18)
*************************************

For ISO 15118 / DIN 70121 compliant communication between EVSE and PEV, Charge SOM supports
CP (control pilot) and PP (proximity pilot) signaling including Green PHY communication.
This Green PHY communication is available on network interface ``eth1``.

**********************************
High-Voltage Connector (HVDC, X19)
Expand All @@ -50,6 +57,37 @@ but also for the corresponding feedback signals to detect contactor welding.
.. note::
The precharge contactor might not be necessary in your setup.

**************
Ethernet (X28)
**************

The X28 socket supports 10/100 Mbit/s Ethernet. In the Linux operating system it
is available as network interface ``eth0``. This interface is part of a bridge
interface ``br0``.

*****************************
EIA-485 Interfaces (X13, X15)
*****************************

In order to connect the Charge SOM to an internal peripheral (e.g. smart meters, display and RFID readers),
the board supports up to two EIA-485 interfaces.

+-----------------+------------------------------------+------------------------------------+
| Board Interface | X13 | X15 |
+-----------------+------------------------------------+------------------------------------+
| Linux Interface | /dev/ttyLP4 | /dev/ttyLP3 |
+-----------------+------------------------------------+------------------------------------+
| Termination | yes, 120 Ohm permanently activated | yes, 120 Ohm permanently activated |
+-----------------+------------------------------------+------------------------------------+
| Local Echo | no | no |
+-----------------+------------------------------------+------------------------------------+

*********
CAN (X16)
*********

The CAN-FD interface is connected to X16, which is a full implementation of the CAN FD
protocol specification version 2.0B. It is available on Linux network interface ``can0``.

********************************************
Insulation Monitoring Device (IMD, X9 + X15)
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