XBee Received Data Is Not Transfering to BS2.

Comments

• Mike Green Posts: 23,101

  2015-12-01 21:34

  How do you have the remote XBee connected to the Stamp? Please show the Stamp program. I wonder if somehow the remote XBee is configured to use flow control and the Stamp is not supplying it. In that case, the XBee will buffer any incoming characters and not transmit to the Stamp. Often you want to use flow control so the Stamp won't miss any incoming characters, but your SERIN statement has to provide a pin for the flow control signal and that pin has to be wired to the XBee.
• Mike Green Posts: 23,101

  2015-12-02 15:58

  So here's what you sent me as a PM:

  '
  Initial XBee Stamp Transmit
  
  ' {$STAMP BS2}
  ' {$PBASIC 2.5}
  
  '
  Constants & Assignments
  baud CON 84
  
  rx PIN 15
  tx PIN 14
  rts PIN 11
  
  DataIn VAR Byte
  
  '
  Main Program
  
  DEBUG "Program Start", CR
  PAUSE 500
  
  GOSUB init
  
  DEBUG "Awaiting Data...", CR
  
  PAUSE 500
  
  DO
  SERIN rx, baud,[DataIn]
  DEBUG "Data Received is ", DataIn,CR
  SEROUT tx,baud,[DataIn]
  LOOP
  
  init:
  PAUSE 500
  DEBUG CR,CR,"Configuring XBee...",CR
  PAUSE 200 ' Guard Time
  SEROUT Tx,Baud,["+++"] ' Command Mode sequence
  PAUSE 200 ' Guard Time
  SEROUT tx,baud,["ATD6 1,CN",CR] ' RTS enable (D6 1) Exit Command Mode (CN)
  PAUSE 100
  SEROUT tx,baud, ["Main Node Initialized"]
  RETURN
  
  
  END
  

  In your initialization, you enable RTS (Request To Send). That's the flow control I mentioned earlier and you've defined rts as I/O pin 11 which I assume you've connected to the XBee module's RTS pin. Your SERIN statement doesn't use flow control:
  
  SERIN rx, baud,[DataIn]
  
  You should add flow control as follows (see the Reference Manual's description for details):
  
  SERIN rx\rts, baud,[DataIn]
  
• tombutler Posts: 5

  2015-12-02 18:16

  Thanks but I already tried that. Made really no difference. Still receive data from main node via xbee and displayed on remote xbee XCTU console. Does not get sent to STAMP. But if I type data on XCTU console stamp displays correctly.
• Mike Green Posts: 23,101

  2015-12-02 18:50

  You might give a call to Parallax Tech Support. I also suggest that you make up a block diagram of your setup under different circumstances or at least a clearer description and post that. I'm still a little confused about what happens when.
• tombutler Posts: 5

  2015-12-02 20:14

  I called Parallax first and they suggested to try here.
  
  Block diagram of the system is attached along with a screen shot and code for both the main and remote processors. Thanks again for your help

  pdf

  pdf

  Simple Coms Set Up.pdf

  491K

  Simple Coms Set Up.pdf 491.2K
• Mike Green Posts: 23,101

  2015-12-03 19:07

  As far as I can tell, you've got the USB Rx and the Stamp's Rx in parallel with the XBee's Tx and the USB Tx and Stamp's Tx in parallel with the XBee's Rx. The two Tx lines may fight each other. The RTS lines from the USB and Stamp are also in parallel feeding the XBee's RTS input. The XBee could theoretically send to both USB and the Stamp if the timing works out right, but you're courting damage to the paralleled outputs.
• tombutler Posts: 5

  2015-12-04 13:03

  OK got it to work by unplugging the USB connection to the XBee adapter. That may be what you were saying above. Anyway I guess I got to smart for my own good by trying to follow the comms flow.
  
  Thanks again for your help.