2 replies to this topic

[SteveS]

Hi. I'm pretty sure this isn't a new question, but I couldn't see a suitable answer, so I'm asking anew. I have a number of different Netduino models (vanilla, Plus, Mini). Since there are both TTL level and RS232 level Tx/Rx pairs, I assume these map TX0/RX0 = COM1, DTx/DRx = COM2. Firstly, do I have these the right way around or not? Secondly, does the transport selection change the port assignments? Thirdly, am I right in thinking that when debugging, the transport selected means the relevant port is not available? Finally, can the transport be identified from within the CLR in some way (in other words, can an app determine which the debugging port is)? I'm wanting to interface to some serial hardware which, like the Netduino, has both 232 and TTL levels (although there's only one UART, there's a MAX232, solder-pad selectable). Since I have spare digital I/O, it occurred to me to hack the solder pads so I can software switch the mode. Power-cycling the device isn't an issue, since I'm using another pin to do just that SteveS

[Nevyn]

Since there are both TTL level and RS232 level Tx/Rx pairs, I assume these map TX0/RX0 = COM1, DTx/DRx = COM2.
Firstly, do I have these the right way around or not?

The pinout cards can be found in the Wiki, if it's not listed as RS232 then it's a TTL level. The pinout for the Plus and the Classic are the same.

Secondly, does the transport selection change the port assignments?

No, the pin assignments remain the same.

Thirdly, am I right in thinking that when debugging, the transport selected means the relevant port is not available?

Correct.

Finally, can the transport be identified from within the CLR in some way (in other words, can an app determine which the debugging port is)?

To be honest I do not know the answer to this one.

Regards,
Mark

[SteveS]

Doh! I have the pinout PDFs printed out and on a cork-board! Shame I didn't look more closely. (I do have an excuse - my advanced years mean I wear varifocals, and unless I squint and sit very close, I can't read them... Only the Mini has direct connection support for RS232 levels, so that just leaves my last query, every thing else is sorted. Thanks. SteveS