![]() An exception is if address zero is used,(or you forget to enter an address when you start). The decoder is first addressed by the Command Station, then the CV is addressed and then the data that is to be written into that CV of that decoder is sent. POM is very useful for tuning loco performance while it is operating and the ack is the change in performance. Program on the Main writes are often called a "blind write" because there is no response from the decoder that the write was successful. If reading fails it usually reports as a 306 error (Timeout Talking to Command Station.) With a few exceptions it is not possible to read from a CV on the Main. The layout gets the same programming! The same is true if you try to program a loco with address zero (or forget to enter an address when you start). Some command stations will only "broadcast" programming commands, which can mean every locomotive on However, because it addresses a specific decoder address, some decoders will not allow you to change the decoder's address using this method! This lets you program a specific decoder on the layout, even while it is
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