XBIB-U【PDF 12/72 页】BOARD USB ZIGBEE MOD PRO

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XBee/XBeePRO"燨EM燫F燤odules??02.15.4?爒1.xAx燵2007.05.031]

2007燤axStream,營nc.

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Chapter??燫F燤odule燨peration

2.2. ADC and Digital I/O Line Support

The XBee/XBee-PRO RF Modules support ADC (Analog-to-digital conversion) and digital I/O line

passing. The following pins support multiple functions:

To enable ADC and DIO pin functions:

2.2.1. I/O Data Format

I/O data begins with a header. The first byte of the header defines the number of samples forth-

coming. A sample is comprised of input data and the inputs can contain either DIO or ADC. The

last 2 bytes of the header (Channel Indicator) define which inputs are active. Each bit represents

either a DIO line or ADC channel.

Figure?04. Header

Sample data follows the header and the channel indicator frame is used to determine how to read

the sample data. If any of the DIO lines are enabled, the first 2 bytes are the DIO data and the

ADC data follows. ADC channel data is stored as an unsigned 10-bit value right-justified on a 16-

bit boundary.

Figure?05. Sample燚ata

Table?01. Pin爁unctions燼nd爐heir燼ssociated爌in爊umbers燼nd燾ommands

AD?燗nalogtoDigital燙onverter,燚IO?燚igital營nput/Output

Pin爁unctions爊ot燼pplicable爐o爐his爏ection燼re燿enoted爓ithin?parenthesis).

Pin Function

Pin#

AT Command

AD0 / DIO0

AD1 / DIO1

AD2 / DIO2

AD3 / DIO3 / (COORD_SEL)

AD4 / DIO4

AD5 / DIO5 / (ASSOCIATE)

DIO6 / (RTS)

DIO7 / (CTS)

DI8 / (DTR) / (Sleep_RQ)

For ADC Support:

Set ATDn = 2

For Digital Input support:

Set ATDn = 3

For Digital Output Low support:

Set ATDn = 4

For Digital Output High support:

Set ATDn = 5

Header

Bit set to 1 if channel is active

Bytes 2 - 3 (Channel Indicator)

Byte 1

Total number of samples

bit 15

bit 0

Sample Data

DIO Line Data is first (if enabled)

ADC Line Data

ADCn MSB

ADCn LSB

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