Digital I/O support

AO (API Output Options) determines the I/O lines available for sampling. By default, AO is configured to be compatible with legacy devices.

• Configure AO to 0 or 1 to make digital I/O available on lines DIO0 through DIO14 (D0 - D9 and P0 - P4).
• Configure AO to 2 to make digital I/O available on lines DIO0 through DIO8 (D0 - D8). This provides compatibility with S1 and S2C devices and is the default configuration.

See Legacy support for more information.

Digital sampling is enabled on these pins if configured as 3, 4, or 5 with the following meanings:

• 3 is digital input.

  • Use PR (Pull-up/Down Resistor Enable) to enable internal pull up/down resistors for each digital input. Use PD (Pull Up/Down Direction) to determine the direction of the internal pull up/down resistor. All disabled and digital input pins are pulled up by default.

• 4 is digital output low.
• 5 is digital output high.

Function when AO = 0 or 1	Legacy Function when AO = 2	Micro Pin	SMT Pin	TH Pin	AT Command
DIO0	DIO0	31	33	20	D0 (DIO0/ADC0/Commissioning Configuration)
DIO1	DIO1	30	32	19	D1 (DIO1/ADC1/TH_SPI_ATTN Configuration)
DIO2	DIO2	29	31	18	D2 (DIO2/ADC2/TH_SPI_CLK Configuration)
DIO3	DIO3	28	30	17	D3 (DIO3/ADC3/TH_SPI_SSEL Configuration)
DIO4	DIO4	23	24	11	D4 (DIO4/TH_SPI_MOSI Configuration)
DIO5	DIO5	26	28	15	D5 (DIO5/Associate Configuration)
DIO6	DIO6	27	29	16	D6 (DIO6/RTS Configuration)
DIO7	DIO7	24	25	12	D7 (DIO7/CTS Configuration)
DIO8	DIO8	9	10	9	D8 (DIO8/DTR/SLP_Request Configuration)
DIO9	N/A	25	26	13	D9 (DIO9/ON_SLEEP Configuration)
DIO10	N/A	7	7	6	P0 (DIO10/RSSI/PWM0 Configuration)
DIO11	N/A	8	8	7	P1 (DIO11/PWM1 Configuration)
DIO12	N/A	5	5	4	P2 (DIO12/TH_SPI_MISO Configuration)
DIO13	N/A	3	3	2	P3 (DIO13/UART_DOUT Configuration)
DIO14	N/A	4	4	3	P4 (DIO14/UART_DIN Configuration)

I/O sampling is not available for pins P5 through P9. See the XBee 3 Hardware Reference Manual for full pinouts and functionality.