Your welcome John! I am in the process of building the interface cable and the LED matrix ... I will update wiki once again (with text and photos) as each task is completed.Originally Posted by wjohn
David 8)
David,
http://doityourselfchristmas.com/wik...y_Instructions
Nice edits to the WIKI, thanks!
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Your welcome John! I am in the process of building the interface cable and the LED matrix ... I will update wiki once again (with text and photos) as each task is completed.Originally Posted by wjohn
David 8)
Matt,Originally Posted by stempile
I ordered this part and have been trying to integrate it into the design as you proposed. The problem is that the pins out on page 9 of the .pdf draft version list NINE connections ... the CAT-5 cable only has eight (as well as the modular plug on the afore-mentioned product you listed as a link). So, I contacted one of the tech guys at Allied Electronics, showed him the .pdf draft manual, and this was his response:
"After reading your PDF file this goes to the Parallel printer port on a PC and that is a 25 pin female (on the PC itself) which requires a 25 pin male connector
The part you've asked about is a female
The Allied number 510-3161 is the male version
But there is a problem I don't understand how to get around
The RJ-45 connector uses 8 pins
looking at your DB25 connector pin-out on page 8 it uses 9 pins
I can't get 9 wires into a 8 wire connector.
You might want to ask the group that's doing this project how they accomplish this.
Jim Beard
Group # 682-757-9204
Direct # 817-595-8511
Technical Sales Specialist
Allied Electronics Inc.
Fort Worth, TX
817.595.8620 FAX"
ANY HELP AND/OR FEEDBACK WOULD BE APPRECIATED!!!
David
The ground does not go to the rj45.
If you use the PS from the control pc you dont need a ground.
If you use a external PS you need a ground wire from the control PC to the PS.
Not having a signal return wire (a ground wire, in this case) in that cable is poor practice. Relying only on a ground wire in the power supply cabling (or a separate wire) means that the system will be fairly susceptible to interference from AC and every other signal floating through the air, as well as quite prone to radiating as well.
If I were building one or more of these boards (which I'm not), I would rework the boards to remove one of the strobe signals from the interface cable (tie pin 4 of the MBI chips to pin 1 of the 4514, and get KC to change the plugin if necessary), and use the leftover pin on the interface cable for ground.
--
Phil
That's what I thought ... the table on page 9 in very deceiving. Thanks for the info Ron!Originally Posted by Ronp
David
David,
During the many changes that were made in the evolution of the LedTriks many users wanted a number of panels daisy chained. Due to data transfer speed limits I used a different data line for each of the four supported panels which left no conductors for the ground. Since we intended to use remote power supplies to feed it there was no problem to connect the ground on the computer end and allow me to support 4 units.
At the time it seemed like a good idea. 8)
Gotcha RJ - information received and understood. My understanding regarding this issue is that the newer laptop RS232 ports provide enough voltage to run the board without the need for an external power supply (transformer) - is that correct? If so, my laptop, although 3 years old, has a CPU clocked at 3.8 GHz and contains 2GB of memory; I assume that this would be sufficient enough to reach approx. +5 volts (and register a logic 1) out of my RS232. My plan (on this board) is to power the LEDTRIKS board directly from my laptop (although I have not actually physically measured the voltage out ... just an assumption)Originally Posted by RJ
David
I don't think that you can power the LEDtriks board from the RS232 serial ports (of any vintage). Even if you added a regulator to take the +12V (give or take) of the RS232 signals down to 5V, there isn't enough current available for powering the controller. The RS232 ports can only provide a milliamps of current, far less than what is needed. You need a beefy supply for the LEDtriks board (since the full current for the LEDs is drawn from the power supply for the LEDtriks).
--
Phil
Originally Posted by dvanteslaar
I use a cable from my bench top supply with an alligator clip hooked to the PC case. Works fine for the bench. I have only 3 panels so might make a cable with the extra single wire not connected like what Phil mentioned. Then again just clip it to the PC case.
ms
Matt Stemple
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