Chapter 4: CodeLock 31Chapter 4: CodeLockCodeLock is a personal four-digit security feature designed toprotect your valuable instruments against theft. You don’t have toactivate the system, but it’s there if you need to. You can activate itusing any CodeLock-compatible control unit on your SeaTalksystem.When you first enter a code and activate CodeLock, the code is sentto all the CodeLock-compatible units on the system. After this,whenever you power on the system, the units will only start up ifthey receive the correct code.Remember to fix a CodeLock sticker by each instrument, to deterpotential thieves.4.1 CodeLock ModesWhen you set up CodeLock, you can choose whether the code willbe sent automatically or must be entered manually at power on, asfollows:• Auto mode is used when there is a display unit situated in a securelocation, ideally below deck, or one which can be unplugged andremoved to a secure location. You enter your chosen code on this“master” unit when you first activate CodeLock. This code is thenautomatically sent to all CodeLock-compatible display heads onSeaTalk, without further intervention, every time the system ispowered on.• Manual mode is used to provide a higher degree of security,perhaps when all your instruments are mounted in exposedlocations. In this case, you must enter your personal code every timethe system is switched on. The code can be entered into anyconvenient CodeLock-compatible control unit, and is then sent to allthe other compatible units via SeaTalk.4.2 Setting Up CodeLockCodeLock is set on the ST600R using the Intermediate Setupoptions.