Hardware

Hardware

Reemplazo del DMX chipset

If your interface is recognized by the software but you have no DMX signal on the output, may be the DMX chip need to be replaced and you can do this easely by yourself.
We advise you to have an available spare DMX chip (RS485 driver). This is an 8 pin electronic IC component that has been set inside the interface box for the purpose of "driving" the DMX512 line. It is available under several references, see below:

USB-DMX Interfaces
	(5V DIP) SP485ECP-L MAX485CPA+ ADM485JNZ
	(3,3V DIP) SP3483EP-L SP3483CP-L MAX3483CPA+ ADM.....	(3,3V CMS) SP3483EN-L SP3483CN-L MAX3483CSA+ ADM.....
	(3,3V DIP) SP3483EP-L SP3483CP-L MAX3483CPA+ ADM.....	(3,3V CMS) SP3483EN-L SP3483CN-L MAX3483CSA+ ADM.....
	(5V DIP) SP485ECP-L MAX485CPA+ ADM485JNZ
	(5V DIP) SP485ECP-L MAX485CPA+ ADM485JNZ

SP = made by Sipex www.sipex.com
MAX = made by Maxim www.maxim-ic.com
AD = made by Analog Device www.analog.com
LTC = made by Linear www.linear.com
ISL = made by Intersil www.intersil.com

You can purchase those components on several websites like www.farnell.com or www.radiospares.com.

Notes:
- for SIUDI 1bis and SIUDI 2, don't forget to remove the CMS chip if you want to plug a DIP chip
- The SIUDI 5 has DMX IN and DMX OUT, so the card uses 2 identical DIP chips. If you need urgently to repair the DMX OUT, a quick solution is to use the DMX IN chip (exchange the 2 chips) and buy a new chip later.


Test of electronic signals (for electronic technicians only)

The DMX DRIVER chip component has 8 pins. Here are the main pins :
Pin 4 DATA INPUT
Pin 5 GROUND
Pin 6 DMX + OUTPUT
Pin 7 DMX – OUTPUT
Pin 8 3,3V or 5V

If there is a correct signal on pins 7 and 8 but nothing on the XLR connector, please check the 4 resistors (see the XLR chapter).
if there is not signal on pin 4, the interface has another problem.

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