CANTERM

A single SKU for FRC teams providing the following features:

1. Fixed mounting junction for CAN connections, compatible with the 0.1" pitch connector of your choice (Molex SL footprints on silkscreen)
2. Solder pads and test points for 22AWG wire
3. 3 connection points - create short stubs out to individual devices and have a passthrough
4. Switchable termination - every junction can be a termination point!
5. Mountable to standard 0.5"x#10 FRC pitch grid

Images

Apologies for the flux slime + sharpied out silkscreen where I labeled things backwards in rev 1.

How to use

Mounting

I recommend a fixed connection to a hard surface, with padding behind to prevent the through-hole pins from making electrical contact.

Here is a WIP Case CAD that accomplishes this.

As a junction

1. Connect your input connector to one set of contacts
2. Connect your output connector to a second set of contacts
3. Set the termination switch to OFF (away from ON)

Debugging

Have a break in your CAN chain but don't know where it is? Use the switchable termination feature to find out where

1. Disconnect your output connector
2. Set the termination switch to ON
3. You should now have a properly terminated network on the input side. If problems persist, the break is on that side. If they don't the break is on the output side.
4. Repeatedly bisect the network until the problem is found
5. Reconnect connectors and set the termination back to OFF

As a terminator

1. Connect your input connector to one set of contacts
2. Set the termination switch to ON

As a junction with a stub

1. Connect your input connector to one set of contacts
2. Connect your output connector to a second set of contacts
3. Connect your stub connector to the third set of contacts
4. Set the termination switch to OFF (away from ON)

As a terminator (soldered)

1. Strip ~3/8" of each of your CAN wires.
2. Feed them through the test points
3. Solder to the contact patches on the back, making sure to also solder through the test points
4. Trim excess wire.
5. Set the termination switch to ON

BOM

1. 3x Molex_SL_171971-0003 (only 2 needed if not making stubs)
2. 1x 120 ohm 0805 SMT resistor
3. 1x SPST 0.1" pitch SMT DIP switch (DS04-254-2-01BK-SMT is what I used)