1. Set Access Point SSID 2. Set Access Point Password 3. Set Access Point Security Mode 4. Use DHCP? 5. Join Network Ex. C1=eS-WiFI_Demo Set SSID C2=LetMeInNow    Set Password C3=4    WPA2-Mixed C4=1    Use DHCP C0    Join

1. Set Protocol to UDP 2. Set Local port number 3. Start UDP Comm Sever EX. P1=1    Select UDP Protocol P2=5024     Set Port 5024 P5=1    Start UDP Comm Server

The base part number is ISM420R1-C33. The ROM Code part number can be read from the GPS in OSP (Sirf Binary) mode only and the version is :  “GS4e -4.1.2-P1”. The GPS will initially come up in OSP at 115200 baud, unless … Continue reading “What is the latest ROM version for the ISM420? How do I read it?”

Function: OSPMID129 Description: Send SiRF MID 129 (Switch to NMEA Protocol) to GPS in OSP mode // where: A0A20018 – Start sequence/Payload length // 81020101000101010501010100010001001000012580 – Payload // 01ABB0B3 – Checksum/End sequence // 81 MID // 02 Mode: 00-Enable NMEA … Continue reading “OPS MID 129 routine (switch from OPS to NMEA) for ISM420-480 EVB”

You need to send a Carriage Return (0x0D) and Line Feed (0x0A) after the checksum (*37) for the SiRF chip to act on the message. Ex: $PSRF100,0,57600,8,1,0*37<CR><LF>

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?”