User's Manual Part 1

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enter the 8 digit numeric lock code (this was loaded into the
transceiver when initially programmed for the network)
press the key
If you are absolutely sure you want to lock the transceiver with
Selcall ID entered use the Scroll keys to select “Yes”
press the key
The transceiver will now send the lock call. A revertive call from
the transceiver being locked will confirm the action.
A transceiver that has been locked by this process can only be
unlocked by using the Barrett programming software. See the
programming software for details.