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M7100 Pinout information

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srioux03

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Nov 10, 2014
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Hello,

I need to describe what the signal used with the M7100 does (high level description) and i didn't find the answer is the datasheet (maybe i have the wrong one).

For example : SPKR1 and SPKR2 are the radio speaker signal.

Those i want to know :

ALO :
RQST:
CUTST:
CTRL_ON:
SW_A:
INP:

Thank you
 

Radioman96p71

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ALO: Analog Low (ground) Used as the return line for analog (audio) signals
RQST: Request Line Used by the control head/radio deck to take control of the RS485 Bus
CUTST: Control Unit Test Tells the control head to reset and self-test. Used mainly during boot-up but sometimes when the radio crashes.
CTRL_ON: Grounding this pin tells the control head to power up.
SW_A: Switched A, primary power circuit, energized to Vin when radio is on.
INP: Input, there should be 2 of these, INP1/INP2. Aux inputs that can be used in programming.
 
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srioux03

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Nov 10, 2014
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Thank you for your fast and accurate reply.

Another question : what are the 13.8V For?

The radio unit is already supply by 72VDC are the 13.8V are for the communication?
 

Radioman96p71

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Not sure what you are using that has 72VDC besides a locomotive or marine.

13.8V is the operating voltage of these radios, nearly all automobiles use this voltage as well, not a coincidence. I'm guessing there is a step-down DC-DC converter to operate that radio from that source.
 
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