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Help with XBee Explorer Regulated

Just received a couple of XBee & boards from SparkFun but I'm unsure how many pins are needed.

 

According to the schematic, http://www.sparkfun.com/datasheets/Wireless/Zigbee/XBee-Regulated-v10.pdf, there's a DIO3 pin.

 

What is it used for?

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PC side is fine, BS2 side needs the addition :

--AIR--- XBee <- XBee explorer regulated <-RS232 converter <- BS2

Connections should be 

  • BS2 pin 1 (SOUT) to the RS232 DB9 pin 2 (RS-OUT)
  • BS2 pin 2 (SIN) to RS232 DB9 pin 3 (RS-IN)
  • BS2 pin 4 (Vss) to RS232 DB9 pin 5 (ground)

What bugs me is that there is no translation of the ATN line for the BS2, and I'm not sure it will work without that connection.

For the RS232 converter to the XBee Explorer to the RS2332 converter the connectinos are :

  • XBee Exp pin DIN to RS232 pin TX
  • XBee Exp pin DOUT to RS232 pin RX
  • XBee Exp pin GND to RS232 pin GND
  • XBee Exp tap on 3.3 volts to RS232 pin Vcc to insure that the XBee is getting 3.3 volt TTL, not 5 volt

In looking at this, it appears that the best option would be going ahead with getting the Xbee Explorer Serial, as it does translate the ATN line for the BS2. It is made to insure 3.3 volt TTL, and deliver all the comminicaions lines. The hack of the level shifter might work or might not, and I probably wouldn't waste the time and shipping cost on hoping it would.

 

would it be possible to connect the XBee explorer board to the 16 I/Os of BS2, similar to Parallax 433 RF modules.

will the voltage compatibility issue still exist?

Even the IOs is a problem. THe BS2 is 5 volt TTL, the XBee requires 3.3 volt TTL.
More information is needed to answer your question.  Are you trying to hook it up to a micro?  Use it standalone?