Hello, I am currently working on a a project involving GPS localization. I am planning to use your GPS module Jupiter 3 [url=http://www.avnet-embedded.eu/fileadmin/user_upload/Files/Wireless/Jupiter_3.pdf]datasheet[/url] (with a 15db LNA active antenna) but I am facing several troubles while connecting it. As I couldn't find any sample wiring schematic I'll show you what I did and you might find where I went wrong. I'll tell you the pins description and what I wired.
1 RXB I Serial Port B Receive - CMOS - levels affected by supply voltage - Not connected 2 TXB O Serial Port B Transmit - CMOS - levels affected by supply voltage - Not connected 3 TXA O Serial Port A Transmit - CMOS - levels affected by supply voltage - Connected to a Max3232 fro reading with serial port 4 RXA I Serial Port A Receive - CMOS - levels affected by supply voltage - Connected to a Max3232 fro reading with serial port 5 ANT_CTRL O External Active antenna power control - Active High - Connected to 2.2K Pull up resistor 6 TIME_MARK O 1PPS pulse - Not connected 7 WTICK I DR version Wheel tick input - Not connected 8 ANT_SC I External Active antenna Short Circuit detect sense line - Active Low - Not connected 9 SPI_CS O SPI Chip select for DR version. - Not connected 10 GND PWR RF Ground - Connected to GND 11 RF_IN I GPS signal input - Connected to my Active antenna 12 GND PWR RF Ground - Connected to the GND 13 RFPWRUP O RF Power enable - Active High - Connected to a 2.2K pull up reistor 14 VCC_RF I RF power input (2.7V to 3.0V) - Connected to a 2.8V Power supply 15 ANT_OC I External active antenna Open Circuit detect sense line - Active High - Not connected 16 GND PWR Power Ground - Connected to the GND 17 BOOT I Boot pin for firmware update - Active High - Not connected 18 GPIO2 I/O General purpose I/O - Not connected 19 GPS_FIX O GPS Fix Indication - Active Low - Not connected 20 SI O SPI IN - Connect to SO for GPS only firmware - Not connected 21 SO I SPI OUT - Connect to SI for GPS only firmware - Not connected 22 GND PWR Power Ground - Connected to the GND 23 SPI_CLCK O DR version SPI CLOCK output. - Not connected 24 VDD_RTC I RTC/BBRAM voltage input (1.1V to 1.3V) - Connected to a 1.2 Power supply 25 RTC_XI I RTC 32 KHz signal input - connect also to RTC crystal if no external clock (2.8V SiGe input) - Connected to pin 26 26 RTC_XO O RTC 32 KHz signal output - connect only to RTC crystal - - Connected to pin 25 27 nSRESET I System Reset input - 200mSec low pulse as detailed - Not connected 28 VDD_BB I Digital and DSP power in (2.7V to 3.0V) - Connected to a 2.8V Power supply 29 ON-OFF I ON-OFF power control and PTF WAKEUP line - Not connected 30 nWAKEUP O Digital and DSP power enable - Active Low. - Not connected 31 FWD/REV I DR version Forward/Reverse input - Not connected 32 GND PWR Power Ground - Connected to the ground
All my ground are connected together.
My problem is that I don't get anything out on my serial port. I am sure about my UART to RS232 Connection, I am using Port A with 9600bps the way it is stated in the datasheet. One more question: Would I get NMEA output even it no antenna is connected (with no way to get a fix then) ? Thank you in advance