Connecting an expansion board - duet 3

dc42

Is the LED on the expansion board flashing in sync with the one on the main board? If so then the cable is ok.

Have you set the address switches on the expansion board to address 1?

mattbaker

@dc42 I tried changing the switches , but no joy. I'll have to check the lights in the morning. Which ones should I be looking at? Colour etc?

mattbaker

@mattbaker If set to 0, would the drive number be P0.6 etc?

T3P3Tony

@mattbaker said in Connecting an expansion board - duet 3:

@mattbaker If set to 0, would the drive number be P0.6 etc?

The expansion board cannot be set to 0 in use (only to trigger a firmware update) in the configuration "0.n" refers to the mainboard.

deckingman

@mattbaker said in Connecting an expansion board - duet 3:

@dc42 I tried changing the switches , but no joy. I'll have to check the lights in the morning. Which ones should I be looking at? Colour etc?

There is red LED on the main that flashes at about 1Hz. There is also a red LED on the expansion board which should also flash in synchronisation with the LED on the main board.

mattbaker

@deckingman The red light on the board flashes quickly, faster than that of the duet 3.

Checked and adjusted the switches set to 1.

I have even bought some cat 5 and rj11 plugs, and a crimper.

Still get the same error messages

deckingman

@mattbaker I'd say that you probably need to do a reset of the board and possibly flash the firmware but I'll leave @dc42 to talk you through that procedure and/or suggest something else.

dc42

@mattbaker said in Connecting an expansion board - duet 3:

The red light on the board flashes quickly, faster than that of the duet 3.

If it's flashing continuously at about twice the speed of the main board, that means it isn't receiving CAN messages.

Only the two middle pins of the RJ11/RJ12 cables need to be connected. The colours must be in the same order at bot ends. Flat cables often have the colours reversed. Round cables normally don't and should be OK.

Make sure you have the two CAN termination jumpers fitted correctly on the expansion board.

mattbaker

Problem appears to be solved. I was using 6 pins, wired straight through. Then I read in another thread only the 4 middle were retired, I grabbed a 4 pin, and red lets flash in sync. And m122 b1 gives a response now.

However didn't realise using a 6 pin cable wouldn't work.

Thanks for your help.

dc42

I'm glad you got it working; but I think your 6-pin cable is faulty. The unused 4 pins on each CAN connector on the expansion board are connected to the same pins on the other connector, but not to anything else.

Flex3D

Dang... now i bought a short twisted adsl 2 cable for 6hc 1.0 and a 1.0 Extension Board.
I've to reorder a non twisted one now?

jay_s_uk

@Flex3D
Twisted is fine. It's crossed that you don't want. As long as the colours are in the same order at each end you'll be fine

Flex3D

@jay_s_uk thanks, so i'm fine with it. When i hold the endings together they are in the same order but twisted from one end to the other.

jay_s_uk

@Flex3D should be fine then

dc42

Twisted pair cables are what we recommend. It's the flat non-twisted cables that tend to have the pins swapped between the ends.

Danal

Note that a flat cable with RJ12 plugs on each end, with the same side 'up' on each end, DOES cross the center pins. Note the 3 to 4 and 4 to 3 below. This is a very common configuration for 'telephone' cables and will NOT work on the Duet CAN.

1      6
2      5
3======4
4======3
5      2
6      1