The interface selection for the Arduino interface is controlled by the switches ARD1
(SW1-1) and ARD2 (SW1-2) on SW1 according to the following logic table:
Below is an image of the switch locations on SW1.
2.3.3 Modem Power On
The development kit can automatically boot the modem when power is applied by
turning SW1-3/Auto-ON to the ON position. This will enable the development kit's built
in automatic turn on circuit using a TI TPL5111DDCR (U1). This circuit will toggle the
modem's ON_OFF pin low once for about 8 seconds after the 4.0V supply is applied.
The automatic turn on circuit can be enabled or disable based using the SW1-3 DIP
switch.
Users may also manually turn the modem on or off by disabling the auto turn on circuit
by setting SW1-3 to the off position and then use SW2, labeled "ON BTN" on the
circuit board, to manually pulse the modem's ON_OFF line low.
PN 1002634 REV 1
© NimbeLink Corp. 2021. All rights reserved.
7
Interface Selection
ARD1 Position
ARD2 Position
Test Points (TP16-TP19)
OFF
OFF
Arduino Interface 1 (D0/D1)
ON
OFF
Arduino Interface 2 (D2/D8)
OFF
ON
USB to Serial Interface
ON
ON
