![]() ![]() The checksum needs to be a byte, therefore you need to wrap it while calculating the checksum. VE.Direct/VE.Hex data is encoded as little endian. However, to ask for the SOC of the batteries, Im not being able to understand how to construct the request, since the code is 0x0FFF, which is greater than 0x55.Ĭan you provide me with an example of a request, for the SOC of the batteries? I would be much appreciated. So, this works fine when the code of the operation is less than 55 (for instance, 0x10 and 0x00 = 0x1000), and I get the same checksums as you do. I have been able to get the data I need from the sensor (BMV-700H), as show in your examples (im quoting your last email below): And if not that, than you can control those pins to be high from within the software. python checksum challenges gcse alevel checksum-calculation challenges-solved. Note that it is normally not necessary to use an external power supply for this: normal serial ports will either automatically drive DTR or RTS high. Takes in a credit card number from a common credit card vendor (Visa, MasterCard, American Express, Discoverer) and validates it to make sure that it is a valid number (look into how credit cards use a checksum). When using an external power supply to power DTR or RTS, the minimum voltage is 5V, and maximum is 12V. And the RS232 side takes its power from the DTR and RTS pins. The VE.Direct side of the PCB is powered from VE.Direct. ![]() When one of those pins is not driven high, you will not be able to receive data!īackground: the “VE.Direct to RS232 interface - ASS030520500” provides galvanic isolation between the VE.Direct product and the host (your computer/PLC/etc). Please note that most RS232 drivers are inverting so the logic level of the DTR must be programmed to zero in most cases. How to program the DTR and RTS differs between used operating systems and hardware. For the communication use the GND, RX and TX pins: pin 5, 2 and 3 on the DB9 connector.Īlso the DTR signal (pin 4 on the DB9 connector) and/or the RTS signal (pin 7 on the DB9 connector) must be driven high to power the isolated side of the the interface. ![]()
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