User`s guide

XBee Analog I/O Adapter
18
Overview
The XBee Analog I/O Adapter provides short range wireless connectivity to
any analog device, with available solutions for both mesh (including
ZigBee) and point-to-multipoint networks. Unlike an embedded wireless
module, which requires design integration and development time, these
off-the-shelf adapters provides instant wireless connectivity to existing
analog devices. All XBee adapters can be used with Digi's ConnectPort X
gateways for data aggregation and IP connectivity.
The XBee Analog I/O adapter allows for several potential interfaces to
analog devices. It provides greater flexibility and uses than the Digi XBee
Sensor Adapter and XBee Sensor products, in that:
• It can be used with a variety of off-the-shelf sensor products.
• It can be used in situations when the item being measured or analyzed
needs to be separated from the sensor/measuring device itself.
Analog Modes
The XBee Analog I/O Adapter has three modes in which it can measure
input on its four terminal lines.
• 0-10 volt mode: The device measures the voltage on a scale of 1 to 10
volts, and translates it into a 10-bit scale from 0 to 1023 as possible
values.
• Current Loop (4 mA to 20 mA) mode: The device measures the
amperage on a scale of 4 mA to 20 mA, and translates it into a 10-bit
scale from 0 to 1023 as possible values.
• Differential input mode: The device measures paired terminals (1 and
2 paired, 3 and 4 paired) and translates the difference in voltage
between the two lines to into a 10-bit scale from 0 to 1023 as possible
values.
A Python module named xbeeain.py is available to set the analog mode;
see pages 24 and 25.
Chapter 5
XBee Analog I/O Adapter