Strato Pi CM
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Strato Pi CM

€149.00 – €219.00 + tax

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Compact industrial Raspberry Pi Compute Module server CE compliant, with wide-range power supply, RTC, RS-485 and watchdog.

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Description

A compact industrial Raspberry Pi

Strato Pi CM is an extremely powerful and compact industrial server based on Raspberry Pi Compute Module, suitable for use in industrial and professional applications where reliability and service continuity are key requirements.

It is compliant with the low voltage and EMC CE directives, as well as the harmonised standards for electromagnetic compatibility, electrical safety, emission and the RoHS directive for hazardous substances.

Features

Mounting:

  • 2 modules DIN rail case
  • power supply and serial connections on pluggable terminal block

Power supply:

  • 9-28Vdc power supply, with surge and reverse polarity protection, and 1.1A resettable fuse
  • up to 3.1A max current to the 5V Raspberry Pi Compute Module power supply input pins (at 24Vdc)

Connectivity:

  • standard RS-485 interface to the Raspberry Pi serial line, with opto-isolator and electrostatic discharge protection
  • 2 x USB 2.0 type-A ports
  • 10/100 Ethernet port

Storage:

  • embedded Raspberry Pi Compute Module eMMC flash memory (8, 16, or 32 GB)
  • hidden microSD slot for Raspberry Pi Compute Module Lite

High reliability and security:

  • hardware watchdog, fully independent from the Raspberry Pi Compute Module, controlled via GPIO
  • real time clock (RTC) with replaceable back-up battery

More:

  • GPIO-controlled LED
  • LEDs for power supply and serial line activity
  • recessed push-button, hidden behind the front-panel, connected to a GPIO pin

 

Highlights

Power Supply

A high quality and stable power supply is extremely important to ensure reliable operation of your Raspberry Pi for continuous 24/7 loads in harsh industrial environments.

Strato Pi CM accepts a wide power supply range and is able to effectively handle substantial amounts of ripple, noise and supply voltage fluctuations. The power supply stage is a heavily protected and filtered circuit, using oversized electrolytic capacitors, diodes and inductors, and a high efficiency voltage regulator.

The step-down converter is based on advanced, high-output-current PWM converter integrated circuits with low resistance MOSFET, with approximately 95% efficiency and up to 1.9A continuous output current (3A peak). It includes over current limiting, over voltage protection and thermal shutdown.

The power supply stage is also protected from reverse polarity with resettable fuses. Surge protection up to ±500V/2ohms 1.2/50μs ensures reliability in harsh environments.

Real Time Clock

The Raspberry Pi relies on Internet time servers to set its internal clock to the current date and time on start-up. If your applications always requires the correct time, even when not connected to the Internet, then you need to have a local real time clock/calendar to permanently keep track of time, even when the Raspberry Pi is off.

Strato Pi CM features a battery-backed real time clock/calendar, directly connected to the Raspberry board through the I2C bus interface. The automatic switch-over to a lithium battery guarantees the functionality of the RTC when its main power supply fails.

The real time clock is based on the MCP79410 general purpose RTCC chip from Microchip. It is connected to the Raspberry Pi’s I2C bus and, besides the standard clock function, it has several other advanced features.

A replaceable CR1025 battery is used as a backup power source when the main power is not available. If Strato Pi CM is always powered, the battery should last well over 10 years.

RS-485

RS-485 serial ports are widely used to connect devices in industrial automation and other applications. The Raspberry Pi lacks the circuitry to implement these protocols. While many USB adapters are available at reasonable price, they are usually not heavily protected and isolated.

The interface circuits of the RS-485 serial ports on Strato Pi CM are insulated from the power supply voltages, thus avoiding possible failures due to ground loops.

The insulation is obtained by means of a high efficiency isolated DC-DC converter and three hi-speed opto-couplers.

A micro-controller automatically manages the data direction of RS-485, taking into account the baud rate and the number of bits, without any special configuration. The Raspberry board can therefore communicate through its TX/RX lines without any other additional signal.

Hardware Watchdog

A hardware watchdog is an electronic circuit that can reset the processor if, for any reason, the software application appears to be stuck. An automatic hardware restart after a software hang can save your day, particularly on unattended applications that need to work continuously.

Taking advantage of the Strato Pi CM on-board micro-controller, we have implemented a hardware watchdog circuit that can be used, upon a software hang, to reset the Raspberry Pi CM.

The Strato Pi watchdog is completely independent from the Raspberry Pi’s internal CPU watchdog circuit and, being controlled by Raspberry Pi’s GPIO pins, it is extremely easy to control from your application and very effective in recovering from unexpected malfunction.

Mechanical Construction

A standard, modular enclosure is usually a strong requirement in most industrial and professional installations. A bare Raspberry Pi CM can’t be used as-is in these cases.

Strato Pi CM is housed in a compact, standard industrial 2-modules wide DIN case with omega-rail mount. On the upper side, it has a removable 5 positions terminal block, with a 0.15 inch pitch (3.81 mm) for power and serial connections.

Specifications

Power supply 9-28V⎓ (VDC)

Reverse polarity protection with 1.1A resettable fuse. Surge protection up to ±1000V/2ohms 1.2/50μs
Current consumption at VS+ 12V⎓

including Raspberry Pi CM current, with low CPU/GPU load and no USB devices connected

 140mA w/o Ethernet and RS-485

160mA with Ethernet and RS-485

Actual current consumption may vary based on working conditions
Current consumption at VS+ 24V⎓

including Raspberry Pi CM current, with low CPU/GPU load and no USB devices connected

 80mA w/o Ethernet and RS-485

100mA with Ethernet and RS-485

Actual current consumption may vary based on working conditions
Raspberry platform compatibility Raspberry Pi Compute Module 1

Raspberry Pi Compute Module 3

Raspberry Pi Compute Module 3 Lite

Raspberry Pi Compute Module 3+ 8GB

Raspberry Pi Compute Module 3+ 16GB

Raspberry Pi Compute Module 3+ 32GB

Raspberry Pi Compute Module 3+ Lite

(tested with Pi Compute Module 3 for regulatory compliance)
Serial communication port RS-485 Half-Duplex with automatic data direction management
Serial port baud rates 1200 to 115200
ESD-Protection Voltage on RS-485 A/B ±15kV human body model

±8kV contact discharge
Surge protection on RS-485 A/B Surge protection up to ±500V/2ohms 1.2/50μs; 600W peak pulse power capability at 10/1000μs waveform
Fail safe feature on RS-485 Yes
Real time clock 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
Housing standard 2M for DIN rail
Operating temperature CM1, CM3: 0…+50 °C

CM3+: 0…+60 °C
Storage temperature -20…+70 °C
Protection degree IP20
Weight 150 g (including Raspberry Pi Compute Module 3)

Documentation

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