vedirect_protocol:faq
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vedirect_protocol:faq [2020-07-20 14:18] – [Q8: How do I calculate the TEXT checksum?] mbosma | vedirect_protocol:faq [2023-03-31 12:04] (current) – mvader | ||
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====== VE.Direct Protocol FAQ ====== | ====== VE.Direct Protocol FAQ ====== | ||
+ | ===== 1. Introduction ===== | ||
More information on the VE.Direct protocol is available here: | More information on the VE.Direct protocol is available here: | ||
* [[https:// | * [[https:// | ||
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* [[open_source: | * [[open_source: | ||
- | Note that, besides | + | Note that, besides |
- | ===== 1. FAQ ===== | + | From a hardware point of view, our VE.Direct ports have four pins: positive, TX, RX and GND. The TX and RX go (almost) directly into the UART of the microcontroller of the product. |
+ | |||
+ | To connect directly to such port, we advise to use either our VE.Direct to USB interface, or our VE.Direct to RS232 interface. Both include galvanic isolation circuitry. Having such isolation is important, as in the product itself (ie. in the solar charger, bmv battery monitor, inverter and so forth) there is very little protection. | ||
+ | |||
+ | More information, | ||
+ | |||
+ | |||
+ | ===== 2. FAQ ===== | ||
==== Q1: Can I use RS232 instead of USB? ==== | ==== Q1: Can I use RS232 instead of USB? ==== | ||
Yes, use the //VE.Direct to RS232 interface//, | Yes, use the //VE.Direct to RS232 interface//, | ||
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</ | </ | ||
==== Q4: Is the VE.Direct interface 3.3 or 5V ? ==== | ==== Q4: Is the VE.Direct interface 3.3 or 5V ? ==== | ||
- | It depends on the product: some are 5v, others | + | It depends on the product: some are 5v, others |
The circuits in our panels and USB interfaces work on both voltages. And they automatically adapt their TX voltage to the voltage level coming from the VE.Direct product (bmv/ | The circuits in our panels and USB interfaces work on both voltages. And they automatically adapt their TX voltage to the voltage level coming from the VE.Direct product (bmv/ | ||
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* BMV-700: 3v3 | * BMV-700: 3v3 | ||
* MPPT all models: 5v | * MPPT all models: 5v | ||
- | * Newer MPPTs (as now under development) will remain | + | * Newer MPPTs (as now under development) will be 5V. |
+ | * MPPT RS, Multi RS, any other RS: 3v3 | ||
+ | * VE.Direct Inverters 250…500VA - 3V3 | ||
+ | * VE.Direct Inverters 800VA & 1200VA 3V3 | ||
+ | * Smart Inverters 1600VA...5000VA - 3V3 | ||
==== Q5: How much current can I draw from the power pin in the VE.Direct port? ==== | ==== Q5: How much current can I draw from the power pin in the VE.Direct port? ==== | ||
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==== Q8: How do I calculate the TEXT checksum? ==== | ==== Q8: How do I calculate the TEXT checksum? ==== | ||
- | I need to get data from a BMV, but do I check the data integrity? The [[https:// | + | I need to get data from a BMV, but how do I check the data integrity? The [[https:// |
**Answer: | **Answer: |
vedirect_protocol/faq.1595247494.txt.gz · Last modified: 2020-07-20 14:18 by mbosma