LabVIEW UART Rx/Tx avec daqmx

[Labo81]

Bonjour, 

Je développe actuellement un banc de test avec LabVIEW. Je vais utiliser des modules NI style USB-600 et des câbles TTL-232R-3V3 pour communiquer en Rx/Tx avec mon outil. 

Tout ceci fonctionne mais je voudrais savoir si il est possible d'utiliser DAQmx pour communiquer en Rx/Tx ou si il existe un module NI qui soit composé d'entrées analogiques, de sorties numériques et de Rx/Tx ? 

Cela me permettrait de gagner un port USB sur mon PC. 

Merci d'avance. Bien cordialement.

[rolfk]

How much engineering hours do you have available? Implementing your own RS-232 interface with digital or analog signals is not impossible but a lot of work for a very mediocre result.

- The resulting interface is electrically NOT RS-232 compliant without extra hardware.

- The achievable baud rates will be extremely low.

- The communication will be even at very low speeds difficult to make really reliable.

[Labo81]

My bench test works 24/24 during weeks and i need a really reliable to have a good result. 

Thanks for your answer. 

[santo_13]

Since you need a reliable solution, you can use USB-232 and you need to use NI-VISA drivers to communicate.

BTW, DAQs do not come with any sort of communication protocol. Typically, DAQs contain Analog Input/Output, Digital Input/Output, Counters and signal conditioning.

[crossrulz]

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@Labo81 wrote:

My bench test works 24/24 during weeks and i need a really reliable to have a good result.

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To maximize reliability, I highly recommend a commercial grade externally powered USB hub for all of your USB connections.  I have had issues, particularly with laptops, where the built-in hubs do not supply enough power for the DAQ and/or RS-232 devices.  I am personally a fan of StarTech for these and USB-RS-232 adapters.