I intend to purchase an LK204-25 display (for a wired remote winamp controller)and connect switches to the keypad interface (rather than a keypad) for play, pause etc. The "parts" would be mounted in a project box and connected to a PC about 10m away. I would like to supply power and data up a single cable which will be suitably terminated each end. Would power line cause any sort of interference on the data lines in a single cable? Also, it would be convenient to send the audio signal up the cable as well (line level - not amplified) - would that work??
Any advice would be gratefully appreciated
Cheers
Babber
Power and Data cable
Well, you would require 4 lines for the basic stuff. RX, TX, +5V and ground. If you modify the cable you can put +5V into it and directly into pin 9 of the DB-9 connector. (you will require to do a solder jumper as well on the PCB)
As for the audio lines... why do you want them in the same cable?
As for the audio lines... why do you want them in the same cable?
Henry J.
President
Matrix Orbital
President
Matrix Orbital
As for the audio lines... why do you want them in the same cable?
-------------------------------------------
To save having two cable runs. I have amplified speakers and I would put a 3.5mm jack socket on the wired remote to take audio to the amplified speakers placed nearby.
As for using +5v from the serial port, I didn't think this was a good idea? I would make a custom back plate taking serial from the motherboard and power from the psu.
Cheers
Babber
-------------------------------------------
To save having two cable runs. I have amplified speakers and I would put a 3.5mm jack socket on the wired remote to take audio to the amplified speakers placed nearby.
As for using +5v from the serial port, I didn't think this was a good idea? I would make a custom back plate taking serial from the motherboard and power from the psu.
Cheers
Babber
Hmmm.. running everything you need in one wire should work... I would be only worried about noise...
"As for using +5v from the serial port, I didn't think this was a good idea? I would make a custom back plate taking serial from the motherboard and power from the psu. "
not sure what you mean here... by running the power cable into the DB-9 connector will save you on another cable. The LCD is capable of doing this, so why not use it
So making a serial + power cable all in one is a good idea, just make sure to have a good big ground wire.
_________________
Henry J.
Technical Support
Matrix Orbital
<font size=-1>[ This Message was edited by: Henry on 2002-01-19 21:50 ]</font>
"As for using +5v from the serial port, I didn't think this was a good idea? I would make a custom back plate taking serial from the motherboard and power from the psu. "
not sure what you mean here... by running the power cable into the DB-9 connector will save you on another cable. The LCD is capable of doing this, so why not use it
So making a serial + power cable all in one is a good idea, just make sure to have a good big ground wire. _________________
Henry J.
Technical Support
Matrix Orbital
<font size=-1>[ This Message was edited by: Henry on 2002-01-19 21:50 ]</font>
From the manual for the LK204-25:-
If the user intends to use pin 9 as the power source, the user must solder the 5 volt jumper point beside the DB9 connector. This is not necessarily a safe operation for a PC based application.
__________________________________________
As I am using a PC based application and I don't want to damage an expensive LCD, thought I should take power from the PSU. By the way, why isn't it necessarily a safe operaton?
Babber
If the user intends to use pin 9 as the power source, the user must solder the 5 volt jumper point beside the DB9 connector. This is not necessarily a safe operation for a PC based application.
__________________________________________
As I am using a PC based application and I don't want to damage an expensive LCD, thought I should take power from the PSU. By the way, why isn't it necessarily a safe operaton?
Babber