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How Far Can We Take Digitrax (3): So it begins, The SE74 , Lets Figure this out. Basic Programming
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- čas přidán 24. 12. 2022
- #SE74 #digitrax #programming
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I applaud you for attempting to explain the SE74. I have two of them and after several days and many 4-letter words, I finally made sense of the thing. I worked with the SE8C and had it figured out. This SE74 works very similarly, but you wouldn't get that from the instructions, which had to have been written by a Russian electrical engineer! You were confused! How do you think a novice just getting into signaling will feel!!!
A couple of points: With regard to the numbering of the turnout connections, if you read the directions you will see that Digitrax refers to the "front" of the SE74 and mentions connecting to the "left." This caused me great problems, because to me the front is the side we are working on, as you did throughout your video. It is also the way the emblem on top of the box is oriented. But Digitrax considers that to be the BACK! You were smart and referred to the diagram for the numbering of the turnout connections. I assumed left to right as I looked at the connector and it took me two days to figure that #1 was on the right side as I looked at the business end of the box. Yes, the diagram is numbered in the direction sheet, but you can't see those numbers on the circuit board with the screw terminal connector mounted on top! Bad design instructions!
I agree with you about the stacking of the signal pins for S1 thru S4, also numbered from right to left contrary to the way we read! Once installed, there are a lot of wires running to a very small space! A better way of looking at the S1 to S4 pins is that each set of pins completes a "signal element" in Digitrax terms (thus the SE in SE74). They consider a signal element to be the A1, A2, B and C locations at one turnout, with A1 and A2 being one crimp on connector, while B and C are the other facing crimp on connector. Thus you have 16 individual heads, each requiring 2 switch numbers. All of this works like the SE8C, but without the nice explanation in the instructions for that device. I kept a set of instructions for the SE8C close while setting up my SE74!!
You didn't explain the control inputs through the pin connector on the far right (looking at the business side of the device) to allow a pushbutton on a panel to operate the Tortoise in addition to the switch commands. We use both on our club layout. There is a table in the instructions to show which connections to make momentarily to operate each of the 4 connected Tortoises. But there is a strong caution here! I found out the hard way that those control inputs are VERY SENSITIVE!!! Everything works fine if the control wires to the pushbutton are less than about 4 feet. I had two longer runs of 8-10 feet and found that the control wires would pick up any kind of induced electricity from surrounding wires and cause the Tortoise to cycle back and forth. Digitrax has come out with version 3.0 of the firmware for the SE74 that is supposed to correct this problem. I have installed it on the 2 SE74s that we have and so far it seems to fix the problem, but I won't be convinced until it works correctly for at least a couple months!
One further comment: You mentioned changing the beginning switch number so that 2 or more SE74s could be operated simultaneously. Anyone familiar with previous Digitrax boards, are familiar with the "board ID" and how to change it. (BDL168, SE8C, etc.). Digitrax has done away with board IDs and now changes the starting Switch number to accomplish making the devices unique. An important difference! Also, as of now, JMRI can't program the SE74. However, I can verify that setting the signals up the same as you would for an SE8C works just fine in JMRI as I am doing that on our club layout!
Thanks again for your video on the SE74. It needs a lot more explanation that Digitrax provides, especially for anyone not a computer programmer or engineer!
Oof yeah good points, specially on the firmware. something i will take into consideration. And agree with JMRI its a spoiler for my next video :)
Awesome!
Good morning buddy good to hear from you today LUL
Hello Rayron, I bought two of the SE74 several months ago and after alot of kicking and screaming I eventually worked out how to make the signalling work. It is great that it can be used for both turnouts and signals but I would love it more if it just did just signals and had a decent set of instructions for the signalling.
Yeap I agree.
Hello. I'm currently working through this, im... most of the way there. My bdn4 lights up in occupancy, and is connected to my se74 via a dscx.... whatever it is little connector board. I'm not getting a occupied message in loconet. I don't have anything connected to the +5v 2 spot terminal on the dscx and I notice you have wires connected to it. Did I miss something?
So can you provide more context on what you want the bd4n and the se74 to achieve?
@rayronvr sure. Ultimately, full jmri dispatcher panel running switch and signal showing and showing occupied blocks. I'm using a se74 and bd4n to act as a "tower" at each of my control points. So far, I have computer control (and throttle) of throwing the switches working, and the LEDs on the bd4n are lighting when track is occupied as I expected it to, however, occupied blocks are not being reported to loconet and that's the last part I need to achieve. Digitrax claims the dsxc4 is plug and play between the se74 and bd4n but I'm suspicious there's more to it? My gut says there should be a +5v connection or reference to ground connected somewhere here, and I noticed in your video you have extra wires beyond the 10 pin ribbons connected to the dsxc4, but I couldn't get a good enough look to see where they were going. (I'm focused on this because I suspect this is why I'm not reporting to loconet, maybe I'm wrong) the switch positions are reporting to loconet so I know that much is all connected right, but the bd4n isn't getting the "occupied" message to the se74.
So the extra wires on the dsxc4 are the momentary push buttons for physical turnout control. I suspect the issue is the se74 and jmri. I ran into the issue that since the se74 is so new, jmri has not recognized the device. May have to get a device that jmri recognizes until jmri is updated for se74.
Not a fan of the stacking pins...you are exactly right.
awesome.... Very informative....
Yeap if you need more detail check out this video from Jim czcams.com/video/BLNosAEa_-0/video.html
Do you have to use the tortoise machines? Seems easier to just wire the turnout directly.
so it really depends on what you want the turnout to do. you dont need to do any of this and just use basic hand throws. I am not sure what your skill level is but wiring to the turnout directly is not as simple as it seems specially in DCC. There are 4 popular ways to control turnouts, Solenoids, slow-motion (tortoise), Caboose hobbies hand throws, and Pin/Rods.