This is a copy of a post for the P929 I wrote last year on a different thread. Not sure if it would work on the regular 929 series.
Turn the radio off. Looking at the pic, the 3rd pin from the left on the top row & the 2d pin from the left on the bottom row are the 2 pins that you would short together & then turn the radio on. It will show field program and ask for a password which should typically be 000000 unless a separate one was set which you should be able to see in the p c software. There will then be different screens that you can scroll Through to get to the different channels and zones using the channel selector knob.
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You'll have to use a pretty small gauge piece of jumper wire to short the 2 pins. it's a little finicky to try to do it that way & turn the radio on at the same time. Vertex actually made a programming plug similar to bendix's programming plug that screwed onto the spkr mic pad. It did nothing more than short the two pins together.