Xbee I/O line passing

Wireless & IoT
1

Hi,

I have a pair of Xbees that work when sending from one terminal to another, but I’m trying to do I/O line passing on a breadboard. I only need 4 i/o pairs but I might as well get all of them to work. I’m doing digital inputs on the remote unit by setting all the DIO values to 3, and digital outputs on the coordinator by setting all the DIO values to 4. Except DIO5 on both of them was left at 1, for the association indicator.

For now, all I want is to see the DIO output LEDs change when the DIO inputs change. What I actually see is on the coordinator (receiver), none of the output LEDs are lit (regardless of what the inputs are) but the association light is solid for about 5 seconds after powerup and then starts blinking (that means it’s associated) but if I try to put an LED on the remote (transmitter)'s association pin, it does not light. After I try this, ATAI has the value 2 for the remote xbee, but 0 for the coordinator. (After serial communication, both are 0.)

I’m following this Digi webpage:

http://www.digi.com/support/kbase/kbase … sp?id=2188

They give the following example:

Remote

DL = 0x1234
MY = 0x5678
D3 = 0x3
D4 = 0x3
IC = 0x18
IT = 0x2
IR = 0x32

Base
	DL = 0x5678
	MY = 0x1234
	D3 = 0x4
	D4 = 0x4
	T3 = 0x64
	T4 = 0x64
	IA = 0x5678 (or FFFF)

I adjusted the following parameters:

**Remote (transmitter):**

*A1-End Device Association was put at 7 (0b0111), so it should be able to talk to any xbee, the addresses and stuff shouldn’t matter.

**Coordinator (receiver):**

*CE-Coordinator Enable is 1

*A2-Coordinator Association is set to 7 (0b111) again so it could talk to any xbee.

Both of them:

*R0-Packetization Timeout was set to 0, I don’t want packets, I just want output LED to change when input LED does.

*As mentioned before, not just D3 and D4 were set to 3 for the remote and 4 for the coordinator, also D0, D1, D2, D3, D4, D6, and D7 were set that way. D5 is 1 for both of them, so I can see the association indicator.

*IT-Samples before TX is 1

*IC-DIO Change Detect is set to FF. I want to monitor all pins for changes.

*IA-I/O Input Address is set to FFFF FFFF FFFF FFFF (with no spaces.) I definitely wouldn’t want packets changing outputs.

*Also for both of them, NI-Node Identifier has the value ROUTER, and IU-I/O Output Enable is 0 because I don’t want the output coming out the UART, I want it coming from DIO0, DIO1, etc.

2

Or maybe the problem is the connections I’m putting on the breadboard. I tested the breakout boards to make sure they were working. Here are my connections:

Vcc to +3.3V (note: right now I’m not using a regulator, just direct 3.3V)

(RESET)’ high (though I’ve tried it both ways with no luck)

GND to ground

DIO1 through DIO7: (for the inputs) connected to either Vcc or GND, except for DIO5 which is unconnected except when I put an LED on it

(for the outputs) all have an LED and resistor to ground.

I can take pictures and/or video if requested.

I hope someone can help. Thanks in advance

3

They are Series 1, and firmware 10E6

4

Also, above where it says

I adjusted the following parameters:

that should say “In addition to following the example, I adjusted the following parameters”

(we can’t edit posts here?)

5

First I have never used IO line passing as I use Series 3 XBees. But I do read the XBee docs.

This is supposed to be fairly easy. I looked up your parameter settings and it seems like it should be workking. So then I googled 'XBee line passing. Maybe some of these will help:

http://www.kobakant.at/DIY/?p=214

http://www.digi.com/support/kbase/kbase … sp?id=2188

I think you have this one.

http://www.ladyada.net/make/xbee/ref.html

http://www.austinhackerspace.org/notes/ … digital_io

I would recommend enabling the input Pull-ups if the pins are normally unconnected, ATPR command.

Hope there is some thing in these that help.

6

Thanks for your response.

This is supposed to be fairly easy.

I hope so.

So then I googled 'XBee line passing.

Just for the record, I did that too, but chose to follow the one from Digi. I can try the others too,when I get a chance.

I would recommend enabling the input Pull-ups

I think they are by default. That last link also mentions disabling the pull-ups on the ones that are being used, I'll look into that.