TTL or RS232 signals as input to PFI counter inputs of PCIE6321

[AsperAstrum]

I have two channels of square wave RS422 signals that are put out by an interpolation device that is using sinus and cosinus inputs. I want to convert these signals via a 3rd party converter or self-built circuit to RS232 or TTL signals. The final purpose is to read these signals with NI PCIE6321 as counter inputs to use for real time measurement. Is it possible to connect RS232 or TTL signals to the PFI counter inputs of PCIE6321. If it is,how? Thank you in advance.

[Henrik_Volkers]

Sorry it's still not clear to me what you whant to measure: The sinus/cosinus (resolver?) signal , the RS422 signal ??

The normal way would be to read the rs422 signal with a rs422 card or rs422/USB converter or use a buildin rs232 port with a converter.

[AsperAstrum]

I will convert the RS422 signal to either TTL or RS232 and want to read this with PCIE6321. Does this make the problem clear? I`m sorry if it isn`t , I`m fairly new to the subject.

[Henrik_Volkers]

Why not use a USB2RS422/232 device? You will save A LOT of work!

And a USB2RS232 is about $10 if your PC don't have one. 

Sorry I don't understand why you want to run into trouble 😉

[Alex_Pi]

there are serveral RS-422 to RS-232 converter boxes on the marked, if you wanted to just convert. Also, there are USB to RS-232 devices on the market.

Ich you want to count with the 6321, then just wire your TTL signal to the connector, and count your events.

[AsperAstrum]

Here`s the current situation. I will use one of the converters on the market and convert the RS422 signal to TTL. I think that this will also enable that the differential signals are converted to single-ended ones. Am I correct on that? I also found out that I have to connect these signals to the DAQ card via a converter block  (BNC2110). This converter block accepts BNC inputs. Most of the rs422->TTL converters I found have DB25P male connectors on the TTL side. As a result I am looking for an adapter or a cable that can wire the DB25P male connector to BNC inputs. I searched through the internet without much success. I will appreciate any help and corrections on my false assumptions if there are any. Thank you.