TROUBLESHOOTING A CAN NETWORK WITH IQAN INTERNAL RESISTORS
Our company uses an IQAN MDL2 setup which ties into the J1939 network of a Caterpillar system.
Our setup is using the internal resistor on the MDL as the terminating resistor on one end of the network and has a standard 120 Ohm resistor wired into the other end.
A machine in the field is having CAN network issues. Typically I am used to checking the resistance of the CAN network and the resistance of the terminating resistors as a standard checkout of the wiring. However with the internal resistor this is proving difficult.
In our lab I powered up a test MDL2 and checked resistance at the MDL with the MDL powered up but no other wiring attached. I found that I would measure ~69 Ohms across the internal resistor at first power up. If I shorted the CAN Hi and CAN Lo together by touching together my multimeter probes it would cause a CAN C "CRITICAL ERROR". After this error I would measure ~115 Ohms across the resistor until the power was cycled on the MDL.
All this said, my questions are:
-Do you have any recommendations for a standard procedure for troubleshooting CAN wiring/resistance?
-In light of the testing I did in our lab could you provide an explanation on how the internal terminating resistor on these IQANs work?
Thanks
MD4 Screen burn-in time without screensaver
How long does a static image need to remain displayed on an MD4-7 screen before image burn-in is noticeable?
Assume worst case. (Worst case being probably full brightness with high contrast graphics??)
What is the recommended time-out for when a screensaver should start? Would just dimming it for the screensaver avoid burn-in? How much should it be dimmed?
The MD4 instruction book (rev 2015-12-02) says:
Burn-in
The IQAN-MD4 TFT display, like other computer screens can have a ghost picture
occur if a static image is left on the display for extended periods of time. For the best
viewing over the life of the product we recommend using the screensaver functionality.
NOTICE
To avoid burn-in, use the screensaver on the display
Standby mode for MD4
Hi everyone,
We want to adding a new feature on MD4 controller. When the system locked function is true, standby mode should be active because of energy-saving.
Best regards.
Two Md3 in the same CAN Bus
It's possible to have two MD3 in the same CAN Bus ?
Have you a specification for this application ?
Thank
MC3 CAN, no contact and CAN error (bus off)
What is the difference between this two Error codes ?
Thank
Adjusting voltage of COUT on an MC2
Using the COUT output from the IQAN MC2, I can adjust the current, but there does not seem to be any way to adjust the voltage. When we measure the voltage across the connector from the MC2, we only get 14V.
Any thoughts on how I can get the IQAN to match the output of the controller from the machine?
Thank you,
Graham
MC3 DOUT leakage current
we connect MC3 to LED working lamp with DOUT channel.
we connect MC3 to LED working lamp with DOUT channel. The Lamb current consumption is about 750mA. when its turn on.
The Lamb turn on its fine no problem. but it works very lackluster When turn of the light. You can see photo on the bottom of the description.
Now, Turn off the lights. So on the photo left lamp connect the C4 DOUT, right lamp connect the C1 DOUT.
these problem are just C4 but C1 DOUT works fine. What causes it?
Thank you.
Problem with my system 1 MD4 and 2 MC3
I have three problem in my system.
Can you help me ?
See above my configuration.
The first one:
In my system, when I supply the modules (1 MD4, 2 MC3), I don’t have any problem. When I power on the engine of the vehicule, sometimes the screen on MD4 is black and is blocked. No action is possible !!!!
The second:
When I power on my engine, sometimes I have an open load message in the MD4 on my Current out or Digital out on MC3. The wiring of the vehicule is good !!!!!
Do you have an idea on the two problems?
The third problem:
In my system I have a LED lights two colors (white and red) but I have three cable.
These leds work with low current ( less 200 milliamps ). We think that it will be possible with the “lowside” .
The first is the +VCC on the red light the second +VCC on the white light and the last is the ground for the two colors. One single LED works . When the red is on ( stop / brake ) the white is off . When he white is ON , the red is OFF.
How so you connects on the MC3 Digital Out?
Freeze of the touch screen on MD4
We are using an MD3 and MD4 as screen on our system.
They print the same info from one CAN BUS
They are on the same system than a generator quite noisy, and when the generator start we loose the touch on the MD4, only the touch.
- The screen still work good
- the Md3 act normal
Did any body experiment the same kind of issue?
I don't have a scope on site I am investigating right now on the issue. I will try to
Power supply the MD4 from an other power source
Isolate the power suply if it doesn't work
I will try to add a capasitor if I have time.
Best wire for CAN connections
We are looking at looming a machine where the data cores could be quite close to wiring used to power solenoid coils and some advise what type of cable to use would be good? Understandably we cannot change it easily so we need to make sure we get it right first time.
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