On-board Push-Button
Push-button switch S1 is a normally open momentary contact switch that can be connected to
processor reset
, pin GPIO5, or neither.
Jumper
When Installed
JMP9
Connecting pins 1-2 connects S1 to GPIO5
JMP9
Connecting pins 2-3 connects S1 to reset
You can also leave the jumper off entirely, and switch S1 will do
nothing.
RS-232 Port
The RF Engine's UART signals are 3.3 volt logic level, and so must go through a line interface
chip before they can directly be used for RS-485, RS-232, etc.
The SN171 Proto Board includes a RS-232 line driver that can optionally be used with UART 1
(SCI 2). Note that this is the
second
serial port of the RF Engine. The first RF Engine serial port
is always 3.3 volt logic level.
Jumper
When Installed
JMP2
The RS-232 chip is powered up
JMP5
UART 1 RXD is RS-232
JMP6
UART 1 TXD is RS-232
JMP7
UART 1 CTS is RS-232
JMP8
UART 1 RTS is RS-232
Remove jumper JMP2 to power down the RS-232 line
driver chip. Remove jumper JMP5 through JMP8 to
disconnect the respective pin from the line interface
chip.
Document Number 600-0011A