Audio Connectors

Rockwell-Collins 
MDM-3001 (female DB-9)
J-1	Function
1	Shield
2	Transmit audio 1 (paired with pin 6)
3	Key open collector
4	Key Reference (6 vdc)
5	Receive Audio 1 (paired with pin 5)
6	Transmit Audio 2 (paired with Pin 2)
7	Key (6 vdc)
8	Spare
9	Receive Audio 2 (paired with Pin 5)

Q9600 (2 Channel)
Channel 1 ("USB" Connector (male DB-9)
Channel 2 ("ISB" Connector (male DB-9)

1	Receive Audio (IN) (paired with 2)
2	Receive Audio (IN) (paired with 1)
3	Key Line (contact closure with 6)
4	Transmit Audio (OUT) (paired with 5)
5	Transmit Audio (OUT) (paired with 4)
6	Key Line Return (with 3)
7	Not Connected
8	Not Connected
9	Not Connected


Q9600 and MDM-3001
Sync Serial Connector - J2

Pin Number	Abbreviation	Usage			Direction
1		SHIELD		Shield Ground		-
2		TxD		Transmit Data 		Input
3		RxD		Receive Data 		Output
4		RTS		Request to Send 	Input
5		CTS		Clear to Send 		Output
6		DSR		Data Set Ready 		Output
7		GND		System Ground 		-
8		CD		Carrier Detect 		Output
15		TC		Transmit Clock		Output
17		RC		Receive Clock		Output
20		DTR		Data Terminal Ready	Input
22		RI		Available, not used	Output
24		XTC		Available, not used	Input

Q-9600 Series modem
Async Ports - Comm 1 and 2
Pin Number	Abbreviation	Usage			Direction
1		CD		Carrier Detect		Input
2		RxD		Receive Data		Input
3		TxD		Transmit Data		Output
4		DTR		Data Terminal Ready	Output
5		GND		System Ground		-
6		DSR		Data Set Ready		Input
7		RTS		Request to Send		Output
8		CTS		Clear to Send		Input
9		RI		Ring Indicator		Input


Important note:	You will not have any receive function unless DTR is active!
		Must be pulled high if not provided by the DTE equipment

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