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MCS 2000 4 wire Question

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spectro

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Feb 11, 2012
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8
Location
Wylie, Texas
I have question regarding getting 4 wire audio out of a MCS 2000? I have previously integrated a Tait TM9155 with an added audio line card to achieve the 600 ohm balanced audio and connected it to a Trunked Analog Gateway (P25 System) by using this pinout:

Description TAG Pin Conn (HD15) Pins Description

E&M Signaling Input 1 <---------> 9 13.8V from Radio
E&M Signaling Input 2 <---------> 12 Busy/Gate
Audio Input 3 <---------> 4 4W_Line_In - (Audio Out)
Audio Input 4 <---------> 10 4W_Line_In - (Audio Out)
Audio Output 5 <---------> 14 4W_Line_Out - (Audio In)
Audio Output 6 <---------> 15 4W_Line_Out - (Audio In)
E&M Signaling Output 7 <---------> 3 PTT-IN
E&M Signaling Output 8 <---------> 7 GND

I am not sure where to get the same inputs and outputs from the MCS 2000 accessory Connector

Pinout for the Accessory Connector

1 SPKR+
2 INT SPKR+
3 SPKR-
4 DIGITAL GND
5 BUSY
6 BUS+
7 I/O 8
8 I/O 5
9 EMERGENCY
10 ANALOG GND
11 FIL AUD OUT
12 AUX RX IN2
13 MIC IN
14 SW B+
15 IGNITION
16 I/O 2
17 LH RESET
18 BUS-
19 SCI RX DATA
20 I/O 4
21 I/O 3
22 RSSI OUT
23 EXTERNAL MIC IN
24 AUX TX IN2
25 UNIV IO OUT

The Ground (Pin 4) is easy enough but I am not sure where to get PTT-In. I think I may have to program it as a I/O. I am assuming I can get voltage from the Bus+ pin 6 which should b easy enough to test with a multimeter. The Busy gate (pin 5) seems clear enough. I think I should use (Pin 11) Fil Aud Out to go to one of my Audio Inputs for the TAG. The rest seems fuzzy on what is most appropriate. Any assistance would be greatly appreciated.
 

n2hbx

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Dec 23, 2004
Messages
308
Location
Lady Lake, FL
MCS2000 Pinouts

Pin 11 is the discriminator audio output--fixed level at approx. 230 mV
Pin 10 is Analog Ground
Pin 13 is TX Audio In
Pin 14 is +12 VDC output when radio is turned on
Pin 21 is PTT input--this is a fixed I/O--no need to program it

If you decide to use the speaker audio, use Pins 1(Spkr +) and 3 (Spkr -). Don't use pin 1 and ground--you will fry the audio amp.

Hope this gets you on the right track.

Larry
 

cmdrwill

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Mar 30, 2005
Messages
3,984
Location
So Cali
Audio out, RX audio should be pin 11 and pin 10. This output is not affected by the volume control.
It is line level about 180 mv. and about 600 - 1000 ohms unbalanced.
 

spectro

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Joined
Feb 11, 2012
Messages
8
Location
Wylie, Texas
Thanks everyone. This is what I think I am going to try:


E&M Signaling Input 1 <---------> 14 12V from Radio
E&M Signaling Input 2 <---------> 5 Busy/Gate
Audio Input 3 <---------> 11 4W_Line_In - (Audio Out)
Audio Input 4 <---------> 10 4W_Line_In - (Audio Out)
Audio Output 5 <---------> 13 4W_Line_Out - (Audio In)
Audio Output 6 <---------> 10 4W_Line_Out - (Audio In)
E&M Signaling Output 7 <---------> 21 PTT-IN
E&M Signaling Output 8 <---------> 4 GND

If this doesn't work I may try to change pin 13 to pin 23 for ext mic in. I am also unclear for the GND for the E&M signaling if I should use Digital or Analog. We will see how it goes.

Much appreciated!

I will post a what worked once I get it working.
 

spectro

Member
Joined
Feb 11, 2012
Messages
8
Location
Wylie, Texas
E&M Signaling Input 1 <---------> 14 12V from Radio
E&M Signaling Input 2 <---------> 5 Busy
Audio Input 3 <---------> 13 4W_Line_In - (Audio Out)
Audio Input 4 <---------> 10 4W_Line_In - (Audio Out)
Audio Output 5 <---------> 11 4W_Line_Out - (Audio In)
Audio Output 6 <---------> 10 4W_Line_Out - (Audio In)
E&M Signaling Output 7 <---------> 21 PTT-IN
E&M Signaling Output 8 <---------> 10 GND

I got the above wiring to work halfway. I get a constant key on one of my P25 Channels. However when I do PTT on the MCS2000 I get audio repeated on that P25 Channel that my P25 portables can recieve. I need to figure out how to make it not constant key and then get the P25 to MCS2000 working.
 

spectro

Member
Joined
Feb 11, 2012
Messages
8
Location
Wylie, Texas
E&M Signaling Input 1 <---------> 14 12V from Radio
E&M Signaling Input 2 <---------> 5 Busy
Audio Input 3 <---------> 13 4W_Line_In - (Audio Out)
Audio Input 4 <---------> 10 4W_Line_In - (Audio Out)
Audio Output 5 <---------> 11 4W_Line_Out - (Audio In)
Audio Output 6 <---------> 10 4W_Line_Out - (Audio In)
E&M Signaling Output 7 <---------> 21 PTT-IN
E&M Signaling Output 8 <---------> 10 GND

I got the above wiring to work halfway. I get a constant key on one of my P25 Channels. However when I do PTT on the MCS2000 I get audio repeated on that P25 Channel that my P25 portables can recieve. I need to figure out how to make it not constant key and then get the P25 to MCS2000 working.

Is there a COR and TOR equivalent on the accessory connector? I will probably need to get into the programming for that?
 
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