TWR-RF-SNAP User’s Manual
Page 18 of 22
4
Configuration Settings
4.1
Jumper / Switch Settings
There are several jumpers provided for isolation, configuration, and feature selection. Refer to the
following table for details.
Jumper Options
Setting
Description
J5
TWR-ELEV
Connection
Jumper
1-2
I2C SCL - Connects I2C_SCL to TWR-ELEV
(ELEV_SCL0)
3-4
I2C SDA - Connects I2C_SDA to TWR-ELEV
(ELEV_SDA0)
5-6
UART RX - Connects UART1_TXD to TWR-ELEV (ELEV_RXD0)
7-8
UART TX - Connects UART1_RXD to TWR-ELEV (ELEV_TXD0)
9-10
SPI MISO - Connects SPI_MISO to TWR-ELEV
(ELEV_SPI0_MISO)
11-12
SPI MOSI - Connects SPI_MOSI to TWR-ELEV
(ELEV_SPI0_MOSI)
13-14
SPI CS
- Connects SPI_SS to TWR-ELEV
(ELEV_SPI0_CS0)
15-16
SPI CS
- Connects SPI_SS to TWR-ELEV
(ELEV_SPI0_CS1)
17-18
SPI CLK - Connects SPI_SCLK to TWR-ELEV
(ELEV_SPI0_CLK)
19-20
RESET
- Connects RESET to TWR-ELEV
(ELEV_RSTOUT_B)
Switch 1
3-Position
Power Switch
Left
Powered via Battery Terminal: Switched towards battery connection
Center
OFF
Right
Powered via USB / Tower System : Switched towards USB receptacle
Switch 2
Push Button
Pressed
Switch connects SM700 GPIO 22 to GND when pressed. Pin can be used as
an interrupt pin to wake the SM700 from sleep.
Switch 3
Push Button
Pressed
Switch connects SM700 GPIO 23 to GND when pressed. Pin can be used as
an interrupt pin to wake the SM700 from sleep.
Switch 4
Push Button
Pressed
Resets the SM700
