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Pinout

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sbkeith

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Joined
May 29, 2005
Messages
41
Here's a question for you M/A Com gurus.. What is the pinout on the accessory port of the standard M/A Com system head (Orion/M7100/725M series) for the speaker connection?

I would like to make my own speaker adapter cable and get rid of this 4 feet of 1/2 in. cable. Any ideas?

Scott
 

nhiester

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May 14, 2004
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Beavercreek / Bellbrook
Here ya go. Listed from pin 1 to Pin 25

1: Sup Gnd
2: XDATAIN
3: XDATAOUT
4: RS485+
5: RS485-
6: CTS
7: GND
8: HKSW
9: OUT2
10: IGN SEN
11: MIC HI
12: ALO
13: VOL HI
14: CTLON
15: XTONENC /SONOFF
16: XTONDEC /SDATA
17: RQST
18: SPKR1
19: SPKR2
20: RTS
21: INP1 /HORNRING
22: OUT1
23: INP2
24: EXTMIC
25: SW A+

You should use pin 18 and 19 for external audio. Do not ground the speaker as this is a floating circut.
 

nhiester

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Beavercreek / Bellbrook
Input 1 and/or Input 2 whichever the radio has been programmed for. Couple either one with Pin 7: Ground and the radio will key up. But you have to program the input you want for PTT
 

buckindb

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Mar 19, 2007
Messages
2
nhiester: is there a method to determining which input was programmed for PTT on my radio?
 

nhiester

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Database Admin
Joined
May 14, 2004
Messages
101
Location
Beavercreek / Bellbrook
You can take either of the inputs to ground and see if they key up the transmitter. If they are not programmed to PTT, they will just emit a low short beep
 
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