4digital and analog i/o – SENA ProBee-ZE20S-SEME User Manual
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ProBee-ZE20S-SExx User Guide Rev 1.8
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4
Digital and Analog I/O
4.1
GPIO (General Purpose Inputs and Outputs) Configuration
The ZE20S module has total 18 I/O pins. Among these pins, I/O pin 2 is assigned to factory reset only
and the user can use the rest 17 pins for general purpose inputs and outputs. The I/O pin assignments
are shown in Table 4-1. As shown in Table 4-1, some pins provide special functions built into the firmware.
Table 4-2 describes the special functions tied to the specific pins.
Table 4-1 Default I/O Pin Assignments
Pin Number
GPIO Number
Special Functions
AI Enable
2
-
Factory reset / Bootloader (SW_0)
X
3
0
Permit joining / Wake-up (SW_1)
X
4
1
UART_DTR
X
5
2
UART_DSR
X
6
3
UART_CTS
X
7
4
UART_RTS
X
8
5
X
9
6
X
10
7
X
11
8
X
32
9
O (AI_0)
31
10
O (AI_1)
30
11
O (AI_2)
29
12
O (AI_3)
28
13
O (AI_4)
27
14
O (AI_5)
24
15
Power LED (LED_0)
X
23
16
Status LED (LED_1)
X
The AT command below can be used to change the GPIO settings.
AT+GPIO=<values><CR> or AT+GPIO<number>=<value><CR>
, where <values> is a number between 0~6 as explained below:
0
Disabled (unmonitored digital input)
1
Digital input, monitored
2
Digital output, default low
3
Digital output, default high
4
Analog input, single ended (only valid for GPIO9~14)
5
Reserved for pin-specific alternate functionalities (See Table 4-2)