User`s guide

XBee Analog I/O Adapter
22
Enable a terminal line for measurement
To enable a terminal line for measurement, the following analog I/O lines
have to be set to value 2:
•D0
•D1
•D2
•D3
D0, D1, D2, and D3 represent terminal lines 1, 2, 3, and 4 respectively. In
the case of a terminal pair in differential mode, only the first terminal of the
terminal pair should be enabled. To disable a terminal line, set the
respective analog I/O line to value 0.
Input specifications and characteristics
Exceeding the maximum or minimum safe input values will result in
damage to the unit.
Analog mode Specification Value
0-10 volt mode Full-scale input 10.25 VDC
Minimum input 0 VDC
Maximum safe input 11VDC
Minimum safe input -.5VDC
Input impedance 28200 ohms
Current Loop (4 mA
to 20 mA) mode
Full-scale input 23.5mA
Minimum input 0mA
Maximum safe input 40mA
Minimum safe input -.5VDC
Input impedance 51.1 ohms
+/- 2 VDC
differential mode
Full-scale input +2.4 VDC differential
0V differential Half-scale reading
-2V differential Minimum-scale reading
Maximum safe input (each pin) 11VDC
Minimum safe input (each pin) -.5VDC
Input impedance ~1 Megaohm