I'm going to apologize in advance if this doesn't make any sense but here we go. I'm running a cm300 in my truck for fire and my 2 meter stuff. I've got a cross bander set up at the house to hit a distant 440 repeater from the mobile but i hate to leave it on all the time in case some how it gets keyed up and runs wild. the x-bander has a remote control dtmf that i can send to switch the cross band on and off but its a "d99" for on and a "d01" for off. in the cps i can't type in the "d" part of the dtmf code. Is there another number that moto uses to represent the "d" command or am I just SOL on this one?
Thunderknight is correct, you need a special mic that has the A B C D column.
If you'll do some googling, you will find info on mics with the 4th column. One of them is the CES 810. It doesn't have the fourth column of buttons but it does have a "mode" button which will allow you to access the 4th column tones and send the "d" code. I know it's not quite as elegant as programming a one touch button on the CM300 that will send the whole code sequence, but it does get the job done. Here's the manual on the mic:
www.repeater-builder.com/ces/pdfs/ces-810-microphone.pdf I happen to have one of them here. I have never used it except for testing, and it works just fine.
I am certain that there are other solutions out there, especially on the amateur radio related boards and sites like repeater-builder.com.
NOTE: The Motorola AARMN4026 DTMF mic has a row of A B C buttons. These are NOT the fourth column tones that you need. They are remote programmable buttons just like the ones on the front panel of your CM300. And the AARMN4026 won't work on your CM300.