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MS3 Pro CAN Id's for Generic Sensor Inputs
I am having an issue getting the correct CAN ID's for Generic Sensor input 1 and 2. I brought the oil pressure into Analog input 2 and set it up as generic sensor 2 with plans to use Analog input 1 as oil temp. I looked up the setting in the Megasquirt manuals and it looks like the real time broadcasting should be ID: 1533, Offset 3, Length 2, *1/10+0, but these values did not work. I reached out to DIYAutotune to ask them what the broadcast ID's were, and they gave the following settings ID: 1515, Offset 2 with no length or equation notes. Going from what I can see in the documentation, this is from the simplified Dash broadcasting, but I need the realtime broadcasting for my RaceCapture Pi Dash. Further in the documentation it talks about the realtime numbers and using a base number of 1520, group 13, offset in group 2 and size 2, which I would think would be ID 1533, offset 2, length 2, but this did not work.
Does anyone have the correct CAN settings for the generic sensor inputs? |
The base broadcast address is 1520 by default. Generic sensors start on broadcast 13, so 1520 + 13 = 1533 or 0x5FD. All of them are two bytes, so generic sensor 1 is bytes 0-1 of 5FD. Sensor 2 is 2-3 on the same, 1535/0x5FF bites 6-7 is sensor 12.
I do not know why it would not work when configured as such. You do have it broadcasting all packets, right? |
I will verify and report back. Thanks for the confirnation.
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You need to configure the data to be real-time broadcasted - only broadcast what's needed, otherwise you're flooding the CAN bus for no reason.
Have you done the following? 1. Configure Generic Sensor Inputs Advanced Engine -> Generic Sensor Inputs Sensors 1-8: 01: Analog in 1 FieldName:Oil Temperature Transformation:GM Calibration <-- assuming GM sensor 02: Analog In 2 Field Name:Oil Pressure Transformation:Linear 0Vvalue:-18.7 5Vvalue:168.8 <-- these are my Honeywell sensor values 2. Configure Realtime CAN data broadcasting CAN bus/Testmodes -> CAN Realtime Data Broadcasting Enable realtime data broadcasting over CAN:On Base message identifier(decimal):1520 <-- this is the base broadcast address for MS data (Messsage ID 1520 contains NumSecondsEcuPoweredOn,PW1,PW2,RPM) There are 4x pages of real-time data that can be broadcast, the other 3 can be accessed via CAN bus/Testmodes -> CAN Realtime Data Broadcasting 2,3,4. To broadcast generic sensor 1 and 2 data (configured as Input Sensor 1 and 2 above in Step 1): 13. sensors 1,2,3,4:5Hz <-- broadcast these values 5x per sec in CAN message ID=1520+13=1533; message contains 4x 2-byte values, sensor 1,2, 3 and 4 (sensor 3 and 4 values are not valid unless you've defined then in Step 1 above) To realtime-broadcast other values, change their broadcast rates from "Off" to what makes sense (eg. 10Hz for positions if you have a 10Hz GPS, 1Hz for slow-changing data) https://cimg1.ibsrv.net/gimg/www.mia...46d208c0a8.png |
None of the settings are working. I have everything enabled and I am getting values, but the values I am getting are not making any sense. If I am getting 30psi in TunerStudio, the CAN data shows something the 900 range.
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Did you ever figure out your issue?
@lokiel question - does it matter where analog sensors are wired into MS3 PNP ? I assume Analog 2 input cannot be broadcasted via CAN? |
Originally Posted by stevos555
(Post 1617024)
Did you ever figure out your issue?
@lokiel question - does it matter where analog sensors are wired into MS3 PNP ? I assume Analog 2 input cannot be broadcasted via CAN? Yes, they must be wired to a MS3 sensor input pin and sensor ground pin (temperature sensors don't care which is +ve). You can solder wires directly to to the MS3 board's sensor input pads but then you need to ensure they won't rip off - use the plug pins. The temperature sensor will also need a pull-up resistor (use 2490ohm if you're using a GM sensor since that's what the MS assumes in its calibration tables). 5V sensors will also require a 5V input which the MS3 pins provide. If you've disconnected your MAF sensor, you can use that pin as input for another sensor. "I assume Analog 2 input cannot be broadcasted via CAN?" Why would you assume this? My example IS using Analog2. I use Analog2. |
Thanks - so my analog 2 options port is now setup for fuel pressure sensor. I was slightly confused why i can see analog 2 assignment under generic sensors but not under custom channel setup .. then i came across your post and now thinking that i can assign real time broadcasting and select the sensor 1 as my analog 2 input pin and broadcast over CAN to a CAN gauge once I get one.
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