Subcategories

• Monarco HAT

  Analog and digital inputs and outputs, RS-485 and 1-Wire bus for the Raspberry Pi

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  Hi Mike, the mentioned sensor is just a voltage divider. The input impedance of AI on the Monarco HAT is 4.24kOhm, which naturally changes the ratio of the divider. Therefore if the resistors are 30k and 7.5k (as per the photo) and the external voltage is 13.2 V, the AI will read 1.09 V. And yes, it will work correctly if you rescale it in software. Though you'll loose some resolution. The input impedance of your multimeter is probably much higher and does not affect the voltage divider that much. Nice example for practicing serial and parallel connections of resistors. Kind regards, Jaroslav
• Modbus TCP

  Need help configuring some of the I/O drivers? Problems integrating custom hardware or software?

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  Hello folks, I just wanted to confirm that reducing the "Max. requests" number to 1 allows multiple Modbus reads of the Click PLC. I agree that reading registers in groups of 4 or 8 is more elegant and will try that next. Cheers, Tom Sisk
• IoT

  Need help configuring some of the I/O drivers? Problems integrating custom hardware or software?

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  Hi Peter, thank you for reporting this and also sorry for difficulties. They made some major changes between version 5 and 6 of ArduinoJson library. I upgraded the Arduino sketch - see attached one. It can be compiled now however I don't have any ESP8266 around so didn't make any further tests. Let me know about your progress. Regards, Tomas 0_1554469564091_REXYGEN_REST_API_example.ino
• 1-Wire

  Need help configuring some of the I/O drivers? Problems integrating custom hardware or software?

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  Hi Jaroslav, I only had 4 sensors, and I am using the Monarco hat. The sensor cables are all 1.5m long is a star formation. I have ordered more as I think I had a bad batch. I have issues with the same sensors not working after a power loss. I will let you know more once I have tried the new sensors. Cheers Mike
• Communication (RS232, RS485, I2C, SPI, UDP, TCP, ...)

  Need help configuring some of the I/O drivers? Problems integrating custom hardware or software?

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  Hi Chris, thank you for reaching out. Yes, it is possible to interface with SX1509 via I2C using REXYGEN. However, it will require a bit of hand-coding. Have a look at function block called REXLANG and its function "OpenI2C" - https://www.rexygen.com/doc/PDF/ENGLISH/BRef_ENG.pdf#page=439 There are also some examples on I2C communication available - "0502 Generic I2C Communication" folder in Examples library (which is part of REXYGEN Studio) - these might help you to see how to implement the I2C communication according to your needs. Let us know about your progress. Regards, Tomas
• General

  Integrations of arbitrary devices, general questions

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  Hi Stepan, I'd go for an external C program for this purpose. The main reason is efficiency and speed of execution. REXLANG is interpreted at runtime, therefore it is slower than native binary code. Either you can use the EPC block or REST API of REXYGEN. These are the 2 most straightforward methods when it comes to external programs. Kind regards, Jaroslav
• Modbus RTU

  Need help configuring some of the I/O drivers? Problems integrating custom hardware or software?

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  Hi Richard, there are various "simplifications", using various offsets to distinguish between the four tables of data. For Holding registers, the most typical is offset of 40000, but as you already noticed, this is no standard. Best regards, Jaroslav