Installation Guide¶

1- Drilling template¶

Download the drilling template here.

Pinout¶

Here you can find all the connectors pinout.

Note

All the part numbers are for the mating connectors

Top view¶

Number	Description	Part Number
1	Micro USB host
2	SD
3	Contactor	Wurt Elektronik - 662008113322
4	Power input	Wurt Elektronik - 662004113322
5	Current sensors	JST - PHR-6

Bottom view¶

Number	Description	Part Number
6	Ethernet
7	AUX	JST - PHR-10
8	AUX2	JST - PHR-3
9	RCD	JST - PHR-4
10	I2C	JST - PHR-5

Front view¶

Number	Description	Part Number
11	Front Panel	JST - PHR-5

Connectors¶

1. Micro USB host¶

Warning

Max 250 mA

2. SD¶

Micro SD slot to expand storage

3. Contactor¶

Drive contactors and check stuck condition.

Pin	Signal	Description
1	N	Neutral
2	N	Neutral
3	Ns	Neutral out sense (not used)
4	LAs1	Line out sense A input 1
5	CL2	Contactor 2 Live terminal
6	CL1	Contactor 1 Live terminal
7	LBs1	Line out sense B input 1
8	LAs2	Line out sense A input 2

LAs1, LAs2 and LBs1 are connected to optocouplers to detect high voltages at the output of the contactor, to detect a welded contact.

Contactor coils can be driven by internal relays output. Connect the main one on pin 2 and 6, and the secondary one to pins 1 and 5.

Check the Connection diagram for more details

4. Power input¶

Connects to neutral and all phases available (1 or 3).

Pin	Signal	Description
1	L3	Phase 3
2	L2	Phase 2
3	N	Neutral
4	L1	Phase 1

5. Current sensors¶

Connects to the TA current sensor(s).

Pin	Signal	Description
1	A_P	Phase A TA input +
2	A_N	Phase A TA input -
3	B_P	Phase B TA input +
4	B_N	Phase B TA input -
5	C_P	Phase C TA input +
6	C_N	Phase C TA input -

6. Ethernet¶

7. AUX¶

Pin	Signal	Description
1	PO2	Pilot signal out 2
2	PO1	Pilot signal out 1
3	RSB	RS485 -
4	RSA	RS485 +
5	CANH	CAN high
6	CANL	CAN low
7	LEDOUT	Programmable digital output, internally pulled up
8	GND	Ground
9	GND	Ground
10	VCC	5V

8. AUX2¶

Pin	Signal	Description
1	VCC	5V
2	LEDOUT	Programmable digital output, internally pulled up
3	GND	Ground

Connector internal schematic:

9. RCD¶

Connects to an RCM14-03 residual current monitor.

Pin	Signal	Description
1	GND	Ground
2	+12V	12V
3	TEST	RCD test output
4	RCD_FAULT	RCD fault input

10. I2C¶

I2C bus for communications. Internal 4K7 resistors.

Pin	Signal	Description
1	NC	-
2	SCL	I2C SCL
3	SDA	I2C SDA
4	3V3	3.3V
5	GND	Ground

11. Front Panel¶

Connects to front panel.

Warning

All logic must be at 3.3V

Pin	Signal	Description
1	RST	Reset
2	RX	Serial receive
3	TX	Serial transmit
4	5V	5V
5	GND	Ground

Connection Diagram¶

Here is the basic connection diagram for the Prism Core

Protocol definition for EVSEsd over ubus¶

Object “evse.control”¶

Port states definition

State	Description
idle	…
waiting	…
charging	…

Command “`reload`”¶

Description:

Forces a reading of the current state for each charging port.

Request parameters:

None

Response:

None

Command “`read_temperatures`”¶

Description:

Forces a reading of the all the temperatures sensors for the charging station.

Request parameters:

None

Response:

None

Command “`set_port_info`”¶

Description:

Sets permanent port configuration parameters.

!!DANGER!! This command sets critical port parameters and must be used only by authorized installers.

Request parameters:

port integer Port number starting from 1
current_max_limit float Maximum configurable current in A
opt_autostart bool Whether the port automatically starts charging when connected
opt_singlephase bool Whether the port only supports single phase charging mode

Response:

None

Sample request:

{
        "port": 1,
        "current_max_limit": 15.90000,
        "opt_autostart": true,
        "opt_singlephase": false
}

Command “`get_status`”¶

Description:

Requests the global state of the charging station.

Request parameters:

None

Response:

firmware string Main firmware version
stm-firmware string Internal STM32 firmware version
stm-cpuid string Internal STM32 CPU id
ports array List of ports with their current state (see below)
temperatures array List of temperatures reading for various internal sensors
error integer Global error state code for the charging station

Single port record definition:

port integer Port number starting from 1
status string Port state
current_limit float Maximum configurable current in A
current_max float Maximum charging current in A
current_now float Actual current in A
voltage_now float Actual voltage in V
power_now integer Actual power in W
energy_session integer Total energy charged in this session in Wh
energy_total integer Total energy charged lifetime in Wh
session_time integer Elapsed time for the current charging session in seconds
connected bool Indicates if a vehicle is connected to the port
threephase bool Indicates if the port is currently using threephase
error bool Indicates if the port is in error

Sample response:

{
        "status": "success",
        "result": {
                "firmware": "Prism 1.0 build 492",
                "stm-firmware": "0.1",
                "stm-cpuid": "12FF4E123E1D001234567890",
                "ports": [
                        {
                                "port": 1,
                                "status": "charging",
                                "current_limit": 32.000000,
                                "current_max": 6.000000,
                                "current_now": 4.800000,
                                "voltage_now": 232.500000,
                                "power_now": 10.000000,
                                "energy_session": 840.000000,
                                "energy_total": 92400.000000,
                                "session_time": 928,
                                "connected": true,
                                "threephase": false,
                                "error": 0
                        }
                ],
                "temperatures": [
                        45,
                        null,
                        null,
                        null
                ],
                "error": 0
        }
}

Command “`set_current`”¶

Description:

Sets the maximum current that can be charged on a specific port.

Request parameters:

port integer Port number starting from 1
current_max float Maximum charging current in A

Response:

None

Sample request:

{
        "port": 2,
        "current_max": 22.500000
}

Event “`port_current_max_changed`”¶

Description:

Notifies that the maximum charging current for a port has changed.

Event parameters:

port integer Port number starting from 1
current_max float Maximum charging current in A

Sample event:

{
        "port": 1,
        "current_max": 8.000000
}

Event “`port_connected_change`”¶

Description:

Notifies that a vehicle has been connected or disconnected from a charging port.

Event parameters:

port integer Port number starting from 1
connected bool Indicates if a vehicle is connected to the port

Sample event:

{
        "port": 1,
        "connected": true
}

Event “`error_change`”¶

Description:

Notifies that an error situation has appeared or disappeared.

*Event parameters:**

port integer Optional port number starting from 1 (zero means a global error)
error integer Error code

Sample event:

{
      "port": 0,
      "error": 80
}

Color codes¶

Prism leds are used to signal all differents mode of function and error codes. Here is all the possible color codes available.

For simpler search thorugth all codes select first the button’s color:

Note

“Can’t find your color? Try this section for other color codes”

Button green¶

Color	Name	Description
	EV charging:	EV charging from the main power
	Overheating	Overheating, EV charge current is limited
	Overcurrent	Current above the set value (< +10%) but under maximum limit. EV charging continues.

Button red¶

Color	Name	Description
	Overheat	Temperature above limit, waiting for cooling
	EV error	EV not recognized, charging not available
	Overcurrent	Current above the set value (> +10%) or above maximum limit. EV charging stops.
	Current leakage	Current leakage, charging not allowed for safety reasons
	Relay stuck	Relay unable to open; voltage is measured at the plug output. Warning Disconnect everything and remove power. Don’t touch the connector. Contact support.
	Voltage error	Voltage drop too big, wires too thin or too long. Check installation.
	RCD test error	RCD test failed
	Overvoltage	Voltage above maximum limit
	Internal error	Internal software error

Button yellow¶

Color

Name

Description

Solar charging

Charging with some power coming from PV panels.

The yellow leds indicate the amount of power coming from solar, each led corresponds to 20% of the total power

Note

In this figure the amount of power coming from solar is 60% (3 yellow leds)

Button purple¶

Color

Name

Description

Update

Update in progress.

Device will reset when updating is completed

Button light blue¶

Color	Name	Description
	Standby	Prism in standby, ready for charging

Others¶

Color	Name	Description
	No internet	No internet connection. User input available only from front panel or with AP connection. Note only last led is purple, the other leds behave normally

Installation Guide¶

1- Drilling template¶

Pinout¶

Top view¶

Bottom view¶

Front view¶

Connectors¶

1. Micro USB host¶

2. SD¶

3. Contactor¶

4. Power input¶

5. Current sensors¶

6. Ethernet¶

7. AUX¶

8. AUX2¶

9. RCD¶

10. I2C¶

11. Front Panel¶

Connection Diagram¶

Protocol definition for EVSEsd over ubus¶

Object “evse.control”¶

Command “reload”¶

Command “read_temperatures”¶

Command “set_port_info”¶

Command “get_status”¶

Command “set_current”¶

Event “port_current_max_changed”¶

Event “port_connected_change”¶

Event “error_change”¶

Color codes¶

Button green¶

Button red¶

Button yellow¶

Button purple¶

Button light blue¶

Others¶

Command “`reload`”¶

Command “`read_temperatures`”¶

Command “`set_port_info`”¶

Command “`get_status`”¶

Command “`set_current`”¶

Event “`port_current_max_changed`”¶

Event “`port_connected_change`”¶

Event “`error_change`”¶