Netduino home hardware projects downloads community

Jump to content


The Netduino forums have been replaced by new forums at community.wildernesslabs.co. This site has been preserved for archival purposes only and the ability to make new accounts or posts has been turned off.
Photo

RS232 Communication


  • Please log in to reply
2 replies to this topic

#1 beerygaz

beerygaz

    New Member

  • Members
  • Pip
  • 3 posts

Posted 16 October 2014 - 03:16 PM

I'm new to the Netdunio and am struggling to communicate with it.  I've hacked a serial cable and have wired pins 2-5 to pins 1-4 on the Netdunio.  When I open putty and power up the mini I get the following:

 

NetduinoMini Build Date: Feb 14 2011 00:59:02
ARM Compiler version 400902
MSdbgV1Rr
.NetMF v4.1.2821.0XIP Program found at 0x0010a000
NetduinoMini, Build Date:
   Feb 14 2011 00:59:53
ARM Compiler version 400902


TinyCLR (Build 4.1.2821.0)


Starting...
Created EE.
Started Hardware.     t?MSdbgV1qt?MSdbgV1wKft?MSdbgV1et?MSdbgV1cPt?MSdbgV1i$Kt?MSdbgV1oǽt?MSdbgV1Mv8t?MSdbgV1K<?t?MSdbgV1A'7t?
                                                                      MSdbgV1GS0t?
     MSdbgV1U't?
MSdbgV1Y<(t?MSdbgV1_
                         /t?MSdbgV1^xt?MSdbgV1t?MSdbgV1wt?MSdbgV1pt?No debugger!
Create TS.
 Loading start at 134134, end 1462d4
Attaching file.
Assembly: mscorlib (4.1.2821.0) (3880 RAM - 33236 ROM - 19134 METADATA)


Attaching file.
Assembly: Microsoft.SPOT.Native (4.1.2821.0) (1144 RAM - 6516 ROM - 4479 METADATA)


Attaching file.
Assembly: Microsoft.SPOT.Hardware (4.1.2821.0) (1752 RAM - 11440 ROM - 7371 METADATA)


Attaching file.
Assembly: Microsoft.SPOT.Hardware.SerialPort (4.1.2821.0) (512 RAM - 3488 ROM - 1543 METADATA)


Attaching file.
Assembly: Microsoft.SPOT.IO (4.1.2821.0) (740 RAM - 4620 ROM - 2522 METADATA)


Attaching file.
Assembly: System.IO (4.1.2821.0) (1548 RAM - 13292 ROM - 5862 METADATA)


Attaching file.
Assembly: SecretLabs.NETMF.Hardware (4.1.0.0) (256 RAM - 1108 ROM - 491 METADATA)


Attaching file.
Assembly: SecretLabs.NETMF.Diagnostics (4.1.0.0) (180 RAM - 440 ROM - 166 METADATA)


Loading Deployment Assemblies.
Attaching deployed file.
Assembly: NetduinoMiniTransportSelector (1.0.0.0) (244 RAM - 1168 ROM - 310 METADATA)


Resolving.


Total: (8788 RAM - 75308 ROM - 41878 METADATA)




Total: (8788 RAM - 75308 ROM - 41878 METADATA)


Ready.

But I can't seem to send anything, it just sits there.  Is that correct?  I thought I could interact with the device from putty?  I've even added a RS232 diagnostic device and can see activity on pin 2 (When the device boots) but nothing when I try and send anything from the PC.

 

Am I missing something?



#2 Chris Walker

Chris Walker

    Secret Labs Staff

  • Moderators
  • 7767 posts
  • LocationNew York, NY

Posted 02 November 2014 - 04:19 PM

Hi beerygaz,

 

Based on the serial dump, it looks like the Netduino Mini is booting properly.  Since you are using RS232 for transport...is there any chance that your serial adapter is USB-TTL instead of USB-RS232?  Or is using a non-compliant voltage swing?  Or that the PC's TX pin isn't connected securely?

 

Chris



#3 beerygaz

beerygaz

    New Member

  • Members
  • Pip
  • 3 posts

Posted 05 November 2014 - 11:47 AM

Definitely not TTL, using a standard USB to RS232 adapter, added a D-Sub connector and broke out RX TX and GND. Tested continuity on all pins. The voltage swing may be an issue, can you give me a pointer as to what it should be and can I spot it with a DMM and no scope?




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

home    hardware    projects    downloads    community    where to buy    contact Copyright © 2016 Wilderness Labs Inc.  |  Legal   |   CC BY-SA
This webpage is licensed under a Creative Commons Attribution-ShareAlike License.