To disarm an ETD system, what should the HTD ID code be set to?

Setting the HTD ID code to 00000 is the correct procedure to disarm an Electronic Train Dynamics (ETD) system. This specific code is standardized within the operational protocols to deactivate the ETD functions, which might include features such as automatic monitoring of train performance and braking systems. By utilizing this ID code, crew members ensure that the ETD does not interfere with the train's operation during certain conditions, such as maintenance or specific types of service scenarios where the ETD functions are not necessary.

Other codes, such as 12345, 99999, and 00001, do not serve the specific function of disarming the ETD system according to standard operating procedures. Using any of these incorrect codes could prevent proper disarming or could lead to unintended consequences, such as maintaining the ETD's active monitoring or causing errors in the system's functioning. Thus, knowing to use 00000 directly supports safe and efficient train operations when the ETD system needs to be turned off.