Technical Specifications - Sfera Labs Strato Pi Base User Manual

Technical specifications
Power supply
Current consumption at VS+ 12V⎓
including Raspberry Pi 4, with Ethernet and RS-485
connected, no USB devices
Current consumption at VS+ 24V⎓
including Raspberry Pi 4, with Ethernet and RS-485
connected, no USB devices
Raspberry platform compatibility
Serial communication ports
Baud Rates on COMM ports
ESD-Protection Voltage on RS-232 TX/RX
ESD-Protection Voltage on RS-485 A/B
Surge protection on RS-485 A/B
Fail safe feature on RS-485
Electromagnetic immunity compliance
Real time clock
3 All tests performed with Raspbian Buster Lite and, on Raspberry Pi 4, VL805 firmware version
000137ab.
28
3
9-28V⎓ (VDC)
Reverse polarity protection with 2.2A resettable
fuse. Surge protection up to ±1000V/2ohms
1.2/50μs
low CPU load: 320mA
100% CPU load, before throttling: 590mA
100% CPU load, throttled: 500mA
Actual current consumption may vary based on
working conditions
low CPU load: 190mA
100% CPU load, before throttling: 320mA
100% CPU load, throttled: 260mA
Actual current consumption may vary based on
working conditions
Pi 4 Model B
Pi 3 Model B+
Pi 3 Model B
Pi 2 Model B
(tested with Pi 4 Model B for regulatory compliance)
RS-485 Half-Duplex with automatic data direction
management
RS-232 Full-Duplex
1200 to 115200
±15kV human body model
±8kV contact discharge
±15kV human body model
±8kV contact discharge
Surge protection up to ±500V/2ohms 1.2/50μs;
600W peak pulse power capability at 10/1000μs
waveform
Yes
EN 61000-4-2 (ESD)
EN 61000-4-3 (Radiated RF Field)
EN 61000-4-4 (Burst/fast transient)
EN 61000-4-5 (Surge)
EN 61000-4-6 (Conducted)
EN 61000-4-8 (Power frequency magnetic field)
Internal RTCC circuit with backup lithium battery.
Only use CR1025 Lithium / Manganese Dioxide (Li/
MnO2) batteries.
Expected battery life without main power supply:
~2 years
Strato Pi Base User Guide