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Revolution Pi Compact FAQ

 

 

Would it be possible to switch off the watchdog timer for the digital outputs of the RevPi Compact Module?

  • Unfortunately, it is impossible to deactivate the watchdog without hardware modifications.

The digital outputs of the RevPi Compact Module cause a peak when switching on, what can I do?

What was the solution?

What is the XXX chip used to multiplex analogue to digital conversions (item 2)?

I have found the following from various specs, etc:

  1. DAC is a Dual channel DAC082S085 chip connected to SPI0 of the Raspberry Pi

  2. ADC is multiplexed from an XXX chip (I assume on SPI1)

  3. Digital I/O is via the GPIO pins (GPIO00 - GPIO27).

Answer:

  • The multiplexer: DG408LE

  • the selection of the analog input is done via GPIO6, GPIO12 and GPIO13

GPIO

DG408LE

GPIO

DG408LE

GPIO6

A0

GPIO12

A1

GPIO13

A2

How can I access the Digital Inputs / Outputs from Codesys?

There is a tutorial which describes the "blinking lights" using Codesys

I want to count rising edges with the Revolution Pi Compact module, is that possible?

Yes, look here:

What is the sampling rate or cycle time of the analogue inputs?

There is a discussion in the forum here, but it is in German

https://revolutionpi.de/forum/viewtopic.php?f=47&t=2945#p10564

Finally, the sampling rate is one second with piControl.

Higher sampling rates are possible without piControl

General information about the analogue inputs and outputs:

Tutorials on the topic with and without piControl

I want to read out an analog PNP sensor with Python – how can I do that?

Have a look at this tutorial:

Have a look at the BitMirror example:

The original discussion is here:

Can the digital inputs work as counters?

No, this is not an integrated function of the Revolution Pi Compact.

Can the digital outputs be used for PWM?

No, this is not an integrated function of the Revolution Pi Compact.

I want to connect RS-485 to PLC by I/O RS-485 at Pin P and N (not USB), what do I have to do?

Have a look at our tutorial

https://revolution.kunbus.com/tutorials/serielle-geraete-anschliessen-compact/

There are two different supply voltages – device and IO channels. Is there a sequence to be observed?

I want to set a GPIO pin high and I don't use piControl. Why does the pin always go low?

There is an undocumented interface on the Revolution Pi Compact, can this be?

The HDMI interface is present but is not considered a warranted capability; therefore we do not warrant or support the HDMI interface.

Can the Revolution Pi Compact be expanded, e.g. with I/O modules?

No, the Revolution Pi Compact is not expandable.

Can the Revolution Pi Compact handle measurements of negative Voltages?

No, the range is 0 - 10 V.

8 x analog Inputs
0-10 V DC, single ended, 16 Bit at piControl, 21 Bit raw value, software switchable current source 2.5 mA

2 x analog Outputs
0-10 V, short-circuit proof, protection against backfeeding, 8-bit resolution,
1 % accuracy, max. current load 10 mA (10 V DC @ 1 k)

RevPi Compact - Industrial Raspberry Pi

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