Why does the cast header of my SBE19plusV2 data display “stop=stop command” when I did not issue a STOP command at the end of the cast? Why did my cast end unexpectedly?

This issue can have a few different causes. The most common cause is noise from your Data I/O connector on your CTD. This noise can be caused by a shorted serial deployment cable or water intrusion under the dummy plug on the I/O connector. To solve this issue, we need to identify what is introducing the noise or causing the bad connection. We first suggest that you check the 6-pin data I/O connector “J3” on the SBE19plusV2 bottom endcap. If you notice it being damp or having any corrosion to the pins, cracked or bent pins, or an improperly fitting seal with the cable, those could all cause these intermittent failures. Next, if there is a Y-cable installed on connector “J3,” perform the same inspection on the 4-pin male connector on the pump/data I/O Y-cable. Again, look for anything out of the ordinary as these are the most common failure points.If these connections seem to be in fine condition, if you have another Y cable available you can attempt to swap this to see if this resolves the issue. If this works, the original Y cable should be discarded and replaced.