User`s manual

RTD Embedded Technologies, Inc. | www.rtd.com 16 COM16155ER/COM16155RER User’s Manual
On when the SIM card is being powered from the cellular module
D3 – 1 PPS
Provides 1 PPS to LED, begins to flash once GPS has satellite fix.
D4 – GSM STATUS Signal
The GSM AT^SSYNC command serves to configure the STATUS pin of the application interface. The pin can either be used to indicate the
current consumption in a transmit burst (default setting) or to drive a status LED connected to the pin. See the AT^SSYNC command for
details.