
Hardware
Pin signals for the through-hole module
XBee/XBee-PRO® S2C ZigBee® RF Module
26
Pin#
Name
Direction
Default
state
Description
24
DIO4
Both
Disabled
GPIO
25
CTS/DIO7
Both
Output
Clear to send flow control/GPIO
26
ON/SLEEP/DIO9
Both
Output
Device status indicator/GPIO
27
VREF
Input
-
Not used for EM357. Used for
programmable secondary
processor. For compatibility with
other XBee devices, we
recommend connecting this pin to
the voltage reference if analog
sampling is desired. Otherwise,
connect to GND.
28
ASSOCIATE/DIO5
Both
Output
Associate Indicator/GPIO
29
RTS/DIO6
Both
Input
Request to send flow control /GPIO
30
AD3/DIO3
Both
Disabled
Analog input/GPIO
31
AD2/DIO2
Both
Disabled
Analog input/GPIO
32
AD1/DIO1
Both
Disabled
Analog input/GPIO
33
AD0 /DIO0
Both
Input
Analog input / GPIO /
Commissioning button
34
[reserved]
-
Disabled
Do not connect
35
GND
-
-
Ground
36
RF
Both
-
RF I/O for RF pad variant
37
[reserved]
-
Disabled
Do not connect
Signal direction is specified with respect to the device.
See
for details on pin connections.
* Refer to
for instructions on using these pins if JTAG functions are needed.
Pin signals for the through-hole module
The following table shows the pin signals and their descriptions for the through-hole module.
Pin
#
Name
Direction
Default
state
Description
1
VCC
-
-
Power supply
2
DOUT/DIO13
Both
Output
UART data out