revised diagnostics page

Author: thilo-huck

docs/io-interface-cards/io-interface-rev6.md

@@ -18,4 +18,5 @@ Dimensions: 50.6 x 47 x 18.6 mm (Width x Height x Thickness)
 | ---------------------------------------------  | :------- | :------------ |
 | RJ45 (8P8C)                                    | Ethernet | 10/100 BASE T |
 | Screw Terminal or CONN HEADER VERT 3POS 2.54MM | RS 232   |               |
+| CONN HEADER VERT 3POS 2.54MM                   | UART     |               |
 | Molex Micro Fit 3.0 or 5 mm Screw Terminal     | Power    | 10 to 30 VDC  |

docs/sonar-3d/sonar-3d-15-diagnostic-log.md

@@ -1,5 +1,14 @@
 # How to take a Diagnostic Log
-If you experience problems with the Sonar 3D-15 that might be related to the hardware and want to submit a support ticket it will be helpful to send us a diagnostic log of your sonar.
+A diagnostic log is one of the most important tools we have for helping you. 
+It allows us to:
 
-You can acquire this in the UI > Settings > "Go to sonar config" Button > "Diagnostics" Tab > Diagnostic Log.
+- Check the health and performance of the sonar.
+
+- Analyse the acoustic environment the sonar is operating in.
+
+- Identify issues related to noise, reflections, and installation.
+
+Submerge the Sonar 3D-15 in water and make sure the front of the Sonar 3D-15 is ideally 0.5m - 2m away from any wall or solid object. 
+
+You can acquire this in the **UI > Settings > "Go to sonar config" Button > "Diagnostics" Tab > Diagnostic Log**.