The command to turn off the GPS in OSP is Message ID 205 (Sub ID 16). So the actual message is: A0A20002CD1000DDB0B3

The FLASH_EN is only needed to Flash the GPS. Reset is needed is you want to exit Flash mode without powering off the GPS. Otherwise not needed in normal operation The ISM480 powers up in an off state. The On/Off … Continue reading “Is flash enable required on the GPS? Reset?”

The ISM420 requires the use of the following circuit in the front end if you plan on using an active antenna. The circuit is not required if you elect to have no power and use a passive antenna. RFin connects to … Continue reading “What inductor do you use for the RF antenna connection?”

Here is the function call: /* Set the rate of the NMEA messages used */ PSRF103(“00”, “00”, “01”, “02”); // GGA at 1 sec rate Here is the function: //—————————————————————————– // Function:    PSRF103 // Description: Send SiRF msg 103 to … Continue reading “How do I set the data rate of the NEMA messages used?”

To enable the 5 Hz, use OSP MID 136.  The field “Position Calc Mode” can be interpreted this way: Bit Mapped.  When set to 1, a bit enables the function. Bit     Function —-      ———– 0     Almanac Based Positioning 1     Reverse EE … Continue reading “How do you change the GPS output rate from a true 1Hz to 5Hz?”

CSR (SirF) change the binary protocol whne they introduced the Sirf IV gps modules. The protocols are very similar but OSP has additional features. Is you are using the ISM300x family of GPS modules use the Sirf Binary. If you … Continue reading “What is the difference between the Sirf Binary and the OSP One Socket Protocol?”

Yes, the ISM300Fx can be flashed in system by pulling pin 8 High upon power up. The module will then boot up in flash mode and you can update the firmware over the UART. This pin has a pulldown interanlly … Continue reading “Can I flash my ISM300Fx GPS in system?”

The GPS modules do not come marked with the Firmware version. You can poll the software using Sirf Binary for the ISM300fx modules and use OSP (one Socket Protocol) for the ISM4xx version of gps modules. If you want to run … Continue reading “How do I confirm my firmware revision on the GPS module?”

The RF in port on the ISM300 connects to the antenna (via the U.fl) or pad 1 and the input of the GPS. It is important to add the external LC circuit shown in the reference schematic on the specification because this will … Continue reading “On the ISM300Fx how should I connect my antenna?”

Use the ISM300f2-x family of GPS’s.