Relay output
Strato Pi CAN has one relay with change-over (CO), Single Pole Double Throw (SPDT)
terminals.
The relay itself is rated for a 6A maximum current but, due to the terminal block size and
isolation requirements, the output contacts are rated for 0.6A maximum current at 65V
(DC).
The relay is controlled by a GPIO pin of the Raspberry Pi.
Dedicated GPIO pins
Strato Pi CAN uses some of the Raspberry Pi’s GPIO pins. These pins should not be used
for other functions.
GPIO pin
Direction
Description
GPIO2/SDA
I
2
C SDA line for the real time clock
GPIO3/SCL
I
2
C SCL line for the real time clock
GPIO14/TXD
out
RS-485 TX line
GPIO15/RXD
in
RS-485 RX line
GPIO8/SPI_CE0
out
SPI chip select line to the CAN Controller
GPIO9/SPI_MISO
in
SPI data in line from the CAN Controller
GPIO10/SPI_MOSI
out
SPI data out line to the CAN Controller
GPIO11/SPI_CLK
out
SPI clock line to the CAN Controller
GPIO24
out
CAN Controller reset line
GPIO25
in
CAN Controller interrupt line
GPIO5
out
cycle high/low for watchdog heartbeat
GPIO6
out
set to high to enable the watchdog
GPIO12
in
high on watchdog timeout
GPIO16
out
set to high to enable the shutdown cycle
GPIO20
out
set to high to sound the buzzer
GPIO26
out
set to high to energise the relay’s coil
14
Strato Pi CAN User Guide