Digi XBee User's Guide download pdf (Page 22)

XBee Analog I/O Adapter

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

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 72 73

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Digi XBee User's Guide Page 22