Configure the EM31-MK2 GPS on the Allegro.
1. Using the stylus, select the EM31-MK2 Set GPS Port Menu.
2. Select the EM31-MK2 GPS
Input Field and choose either Enabled or Disabled depending on whether using GPS for the survey or not. When the GPS is disabled, a message stating GPS Disabled will be seen where the GPS coordinates would usually be in the logging mode.
3. Select a Com
Port in the Serial Port Field if enabling the EM31-MK2 GPS. COM2: is the default GPS Com port. It is important that the GPS port is different than the port specified for EM31-MK2 data acquisition.
4. Specify the correct Baud Rate
for the EM31-MK2 GPS system. By default the Baud Rate is set to 9600, which is a fairly common setting. Always use the baud rate set by the manufacturer. Baud Rates include 4800, 9600, 19200, 38400, 57600, and 115200.
5. Match the Parity
to the GPS’s parity. Options include No, Odd, or Even. The default is No.
6. Select the Data Bits
Value that matches the GPS receiver. The default is 8 although it can be adjusted to 7.
7. Select the Stop Bits
Value that matches the GPS receiver. The default is 1 although it can be adjusted to 2.
8. If the Monitor GPS Output
Button is tapped, the EM31-MK2 program will be in terminal mode, displaying the GPS receiver output, the last NMEA command sent to the GPS receiver, and three command buttons: Pause/Go, Send, and Exit.
Every time the EM31-MK2 GPS records its location, information is sent and displayed in the terminal mode. If the user receives a message of “No Data,” the GPS settings or connection are not correct. The GPS monitoring can be stopped and restarted at any time using the Go/Pause Button. The Send Button allows the user to send a NMEA command to the GPS receiver. GPS parameters should be set using the GPS’s interface or manufacture’s software. However, if the user is familiar with the GPS’s system and NMEA protocol, he or she may use this button to give commands. It is important to note that not all GPS systems use NMEA protocol and some do not accept commands sent through serial cables. The Exit Button is used to leave the terminal mode.
9. After changing the EM31-MK2 Set GPS Port options, it is important to save.
Press the OK Button to save. After pressing the OK Button, it is safe to push the X Button to exit. If the user exits without pushing the OK Button, the changes will not be saved.