Edgetech 4125 - Magnetometer Digital Interface; Serial Device; Figure 1-5: Edgetech 4125 LT Mag; Power Y-Splice

1-5
Figure 1-5: EdgeTech 4125 LT Mag / Power Y-Splice
1.3
Magnetometer Digital Interface / Serial Device
The EdgeTech side scan telemetry is used to transfer the magnetometer data to the topside. The
magnetometers have a bidirectional RS-232 interface at 9600 bps. The magnetometer data is read by
the towfish electronics, encoded onto the side scan telemetry, and then decoded on the EdgeTech
Portable Topside Laptop or Rack Mount with Topside and is made available on a PC standard Com port.
Control messages from the PC hosting the magnetometer user interface software, are likewise
transferred to the magnetometer towfish. A null modem serial cable is required to connect the
EdgeTech topside to a laptop or PC running the magnetometer acquisition software (Sealink, Maglog,
etc.).
The EdgeTech telemetry allow for a full bi-directional communication link between the topside and the
magnetometer, where data flow upstream and commands flow downstream.
To properly relay the ‘Mag’ data from the towfish onto the PC/laptop running the magnetometer
acquisition software, the SONAR program running in the tow fish as well as the DISCOVER software
running on the topside need to be configured properly. The following shows the required fields in the
initiation files. This is a feature that has to be added to tow fish and is password protected. If you have
already had the password installed follow the following procedure, if the password has not been