Accessory Connector

J2 is the accessory connector

Here's a picture of it from the radio side

Table of Pins

Rear Accessory Jack Pin Functions
Pin	Name	Function
1	GRND	Ground
2	BUS+	SB9600 BUS+ Data
3	BUS1	SB9600 BUS- Data
4	TXD	RS232 Transmit Data
5	RXD	RS232 Recieve Data
6	USB-	USB - (White)
7	USB+	USB + (Green)
8	RESET	SB9600 Reset
9	BUSY	SB9600 BUSY
10	CTS	RS232 Clear to Send
11	RTS	RS232 Request to Send
12	USB PWR	USB Power +5v
13	CHAN ACT	Chanel Activity (COR+PL
14	GRND	Ground
15	EMERGENCY	Emergency
16	PTT	Push to Talk
17	ONE WIRE	One-Wire Data
18	VIP OUT 1	Vehicular Interface Output 1
19	VIP OUT 2	Vehicular Interface Output 2
20	SPKR+	Speaker+
21	RX FILT AUDIO	Receive Filtered Audio Out
22	Monitor	Monitor Overrides PL
23	AUX MIC	Rear Mic Input
24	SW B+	Switched Battery Voltage
25	IGN	Ignition Sense
26	SPKR	Speaker -

Sourcing of connector

As of now, there is no other source for the connector than Motorola. The rumor mill puts money on ITT Canon being the manufacturer.

The pins come in a 25 pin strip Motorola Part Number: 3980034F05

The housings are HLN6961

The body looks like 2 D-Sub connectors stacked with standard pitch spacing on the pins.

Aftermarket Pins will not work due to the low profile retaining ring. This thread on the Batlabs Batboard has some more info and this picture showing the differences below:

XTS accessory Pin detail vs. normal pins

Notes on assembly

The TE 91285-1 Pin extraction tool is highly recommended. DigiKey Link

The Engineer PA-09 is recommenced as a crimper.

Photos of connector

I disassembled and took some close up pictures with my scope. The connector looks a bit similar to most D-SUB connectors.

Operational notes

The 900 MHz radio has an option for the pre-amp, you want this enabled.

The other concern for 900 MHz was the preselector B7250, and it's the same device from the MCS2000. Motorola describes it as a 6 MHz wide unit centered on 938 MHz, and then another follow the pre-amp for an image filter. In testing with a tracking generator it was found roll-off didn't happen until about 915 MHz and 960 MHz. This should be (and is) a fine ham band receiver.

The programing info for modifying CPS to program the hamband is on the XTS 2500 page.