Hi all.
Im having problems reading some 4-20 ma sensors with Xbee AIO Adapter.
I can read correct values of sensors with arduino using a 250 ohm resistor to convert 4-20ma to 1-5V and appling +12V to the sensor with and exteral power supply.
I can see how change the value when i apply heat to the sensor.
But when i connect the sensor to de AIO Adapter in 4-20ma mode, its reads always the same value (122). This value readed dont change the value when i apply heat to the sensor.
I follow all the instructions correctly from https://www.digi.com/wiki/developer/index.php/XBee_Analog_I/O_Adapter and i set terminal 1 and 2 for 4-20ma mode, d0 and d1 to 2 for analog input and P3=5 to output the 12V to the sensor. I also put on the dip switch 2 as manual says.
Any suggestions?
Thanks in advance.
This is the diagram.
Your text to link here…
In this first image the multimeter shows me a 10 mA current, so the sensors works fine with the supply voltage of AIO Sensor.
But if i disconnect point A and connect it to pin1 on AIO Sensors as shows in picture 2, the multimeter shows me a 2 mA value.
So the sensors doesnt works when i close the circuit into AIO pin.
Your text to link here…
More Info.
The AIO Adapter config is
XBP24-ZB_26A7.mxi
0
0
0
26A7
0
[A]AR=FF
[A]LT=0
[A]BH=0
[A]CI=11
[A]CR=3
[A]DH=0
[A]DL=0
[A]DE=E8
[A]D0=2
[A]D1=2
[A]D2=2
[A]D3=2
[A]D4=4
[A]D5=1
[A]D6=4
[A]D7=4
[A]D8=4
[A]P0=4
[A]P1=3
[A]P2=4
[A]P3=5
[A]IC=0
[A]NT=3C
[A]EE=0
[A]EO=0
[A]ID=0000000000000000
[A]NJ=FF
[A]JN=0
[A]JV=0
[A]NH=1E
[A]NW=0
[A]NI=AIO_TEST1
[A]PO=0
[A]PL=4
[A]PM=1
[A]PR=FE1
[A]RP=28
[A]IR=0
[A]SC=204
[A]SD=3
[A]SN=1
[A]SM=0
[A]SO=0
[A]SP=20
[A]ST=1388
[A]SE=E8
[A]ZS=0
[A]V+=953
[A]WH=0
I can read the sensor value througth AI pin1 when connect a 250ohm resistor to ground as shows in picture3.
Picture3
Did you solve your problem? Because I have the same when I use RS-485 Analog I/O Digital I/O works properly coupled to resistors, however when sensors 4-20mA are coupled didn’t work.
Hey I know its oldest question of the forum but is your project is in working fine ? If yes can you help me out with schematic as i am also trying same with the help of 4-20mA current loop receiver as mentioned below:
https://store.ncd.io/product/2-channel-4-20-ma-current-loop-receiver-16-bit-ads1115-i2c-mini-module
