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azn103

[PMOD] Interface Specifcation Confusion

Question

I was looking at the PmodUSBUART, PmodRS232, PmodRS232X and the Digilent Pmod Interface specification and need some clarifications

The PmodUSBUART and PmodRS232X uses the Type 4 Pinout and the PmodRS232 uses the Type 3 Pinout. 

The table pinout on the Pmod Interface Specification is for the Host for Type 3 and Type 4 UARTs.

Can someone verify that my assumptions are ok?

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Hi azn103,

You are correct in what you are seeing for the Pmods. The reason there is a difference in the first place is because a few years back the PIC32 microcontroller chip was changed so that the UART interface layout/organization changed, resulting the in the Type 3 to Type 4 change that you see. 

The tables in the document are only for the Pmods though; they do not define what the host header looks like, only what the headers on the Pmods themselves look like. A direct pin-to-pin compatible host would instead have the reverse of the pins -- i.e. RTS where there is a CTS and vice-versa, and a TXD where there is a RXD and vice-versa.

Are just wanting to confirm how the Pmod pins are arranged or wanting to see overall how Pmods are designed to interact with the "outside world"?

Thanks,
JColvin

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Hi JColvin,

Thanks for the reply!  I wanted to be sure how the pMod pins are arranged so that I have them hooked up correctly.   Also I assumed that the pMod UARTs are DTE based.

 

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Hi azn103,

The Pmod's (at least the PmodRS232 and the PmodRS232X) are actually both designed as DCE devices.

Let me know if you have any more questions for me.

Thanks,
JColvin

Edited by JColvin
clarification

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