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Firmware has handled this really well
Current CV Laptop Specs
Model: Lenovo Thinkpad T490
Processor: i5-8265U base 1.80 GHz boost 3.90 GHz 4 cores 8 threads
Memory: 8 GB (2x4) at 2400
Storage: SKHynix_HFS256GD9TNI-L2B0B 256 GB SSD
Graphics: Intel UHD Graphics 620
VectorNav Connection Notes:
All VN inputs from VN-300 connect to the H7 microcontroller in H7PartA.SchDoc. TX1/RX1 are optional as the breakout board is also optional. Primary communication will take place over TX2/RX2. VN-300 communication is all asynchronous.
RESTORE_VN details:
If high at reset, the device will restore to factory default state.
Internally held low with 10k resistor.
Header to send the RS-232 lines to https://www.sparkfun.com/products/11189 aka a MAX3232 breakout board for conversion into TTL. In our case the board only performs a bit flip thought it is capable of voltage scaling as well.
The header we use is a six pin header. This is because the MAX3232 can convert 2 Rx/Tx pairs, but we’ll only need to do one conversion maximum.
The pin ordering is exactly as is specified in the MAX3232 datasheet.
The header is optional if firmware wants to use the second set of rx/tx.
Rx/Tx comes in from VN is _VN, they are flipped on the H7PartA page when they are connected to the microcontroller.