B&K 1787B - Manual (Page 18)

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n Setting Address (>ADDRESS)
This instruction can set the communication address for each power supply. The address range is
from 0 to 254. Before the communication, you must make sure that there is same address
between the power supply and the computer.
n Setting password for function keys(>KEY LOCK)
This instruction can set a password (1 through 4 digits) to lock the function keys operation. After
setting the password, all the function keys on the front panel will be locked except the OUT on/off
key. You must enter the correct password to unlock them, then you can continue to do the function
key operation. If you don’t want to lock the function keys, please don’t press any number key when
you enter the >KEY LOCK instruction, just press ENTER key to unlock it.
Note: Default address is 0. When the power supply receives a frame instruction from
computer, the LINK indicator will light on; it means that the power supply started
to communicate with computer. If the power supply hasn’t received the signal
from computer for 3 seconds, the LINK indicator will be turned off and it means
that the power supply can not communicate with computer.
Note: When shipped from factory, there is no password and function keys are
unlocked. The start bit of your desired password shouldn’t be 0.