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3 Quick Start
In order to allow an easy and quick start with the A5100-A module, this chapter pro-
vides a short overview on the important steps to be taken to receive NMEA mes-
sages with position information on a serial port (UART).
NOTE
1: The A5100-A needs an external pull-up resistor to be configured for
UART operation. Please consider the pull-up resistor in your design or pull
the GPIO up right after reset by other means.
NOTE
2: The ON_OFF input of the A5100-A needs to be connected to output
of a microprocessor. For a wake-up, including the initial one after power on, a
LOW-HIGH transmission is mandatory.
3.1 Minimum Configuration
Figure 5 shows the minimum configuration for NMEA outputs and commands sent
via an RS232 interface based on the GPS/GLONASS module A5100-A using a
passive antenna. It's recommended to supply Vcc continuously for normal operation,
the module can enter power saving and hibernation modes by toggling the ON_OFF
pin or sending commands.
Figure 5: Minimum configuration A5100-A with continued Vcc supply
Remarks:
• External antenna input impedance is 50 Ω. Match as close as possible.
• Supply Vcc continuously, use toggling of ON_OFF to switch between normal
operation and hibernate mode
V1.0-Mar-14
User's Manual
Page 13 of 43
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