Clamshell 32/16/8 Mode Basic Cable Pinout Example
		- Description
		- J1 Connector
		- Black 22 Pin Connector
		- Blue 22 Pin Connector
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Here is a typical negative ground pinout for a clamshell HCN1020A (32 mode select), or HCN1022A (16 mode Talkaround - really 32 modes), or HCN1019A (16 mode), or HCN1023A (8 mode Talkaround - really 16 modes) or HCN1009A (8 mode) control head. The pinout is for the radio connector J1, control head conectors 22 pin black and 22 pin blue.

This clamshell control head internal mode select lead (BLK/WHT) is attached to Shield Ground on pin 21 of the black 22 pin connector, not to Mode Strobe on pin 5 of the black 22 pin connector.

Cable's J1 connector front view pin out (cable on left side).

J1 CLAMSHELL PINOUT
J1	22 pin BLACK	22 pin BLUE	J1 DESCRIPTION
A			A+ (Red Wire)
B			A- (jumpered to J1 pins 8 and 10) (Black Wire)
J1-1	5		Control Head Strobe
J1-2	16		Detected Audio
J1-3	20		Volume - Receiver Audio
J1-4	22		PTT
J1-5	14		PTT Reference
J1-6			Squelch Tail
J1-7			Securenet Modulation
J1-8	9		Switched B- (jumpered to J1 pins 10 and B)
J1-9			Switched B+ to Accessories
J1-10	9		Chassis (jumpered to J1 pins 8 and B)
J1-11		6	Mode 12
J1-12		4	Mode 5
J1-13		11	Mode 1
J1-14	10-21		Shield
J1-15	1		Switched B+
J1-16		14	Mode 6
J1-17		22	Mode 2
J1-18
J1-19		19	Mode 10
J1-20			Transmit Indicator
J1-21			Transmit Mode
J1-22	6		Speaker Audio Low
J1-23		9	Mode 7
J1-24		1	Mode 3
J1-25		3	Mode 4
J1-26		8	Mode 9
J1-27	11		Mic. High
J1-28	17		Squelch
J1-29		7	Mode 8
J1-30		10	Mode 11
J1-31			Channel Scan Enable {JU1 installed}
J1-32	4		PL/DPL Disable
J1-33	7		Display Enable {JU14 removed}
J1-34			Sidetone In
J1-35			EMS Mute
J1-36			Transmit DVP
J1-37	3		Speaker Audio High

• Important notice: If you have a HLN4760C Personality Board J1-33 is a DVP-XL line, not a Display Enable line. Also jumper J21 should be in the A position. If it is in the B position then J1-5 becomes a DVP-XL line and it should only be connected to a DVP-XL control head. The example in the above table works with all other Personality Boards including the HLN4257 and TRN8861 which do not have jumper JU14.
• An external scan on/off switch can be used if a wire is connected to J1-31 and JU1 is removed. The switch should be switched to ground to enable scanning. However, there will not be any scan display with this control head.
• Some radio cables have the white/gray wire connected from pin 5 of the blue 22 pin connector to J1-31 (Channel Scan Enable) (JU1 would not need to be installed). Some other non-DVP cables have the white/gray wire connected from pin 5 of the blue 22 pin connector to an unused J1-7 pin (JU1 is needed to enable the scan or the wire needs to be moved to J1-31).
• Sometimes a J1-34 Sidetone wire will be installed in a spare 22 pin connector that is not used and tied back to the cable. Sidetone is only hooked up inside the radio on "VXJ" models.

22 pin Clamshell connector rear view pin out.

BLACK 22 PIN CONNECTOR CLAMSHELL PINOUT (HCN1020A)
PIN #	22 pin BLUE	J1	DESCRIPTION
1-B17		15	Switched B+
2			Hang Up Box Gnd.
3-B20		37	Speaker Audio Hi
4-15		32	PL/DPL Disable
5		1	Mode Strobe *
6-9-19-B5		22	Speaker Audio Low
7		33	Display Enable *
key
9-6-19-B5		8	Chassis
10		14	Shield
11		27	Mic. High
12			A+ Unswitched
13			A+ Ignition Switch
14		5	PTT Reference
15-4			Hang Up Box Switched
16-B15		2	Detected Audio
17		28	Squelch
key
19-6-9-B5			(Speaker Audio Low)
20		3	Volume - Receiver Audio
21		14	Shield
22-B18		4	PTT

• If the clamshell control head internal lead is connected to the black connector pin 5 (J1101-5 Control Head Strobe) it must be moved to the black connector pin 21 (J1101-21 Audio Shield).
• Any pin shown as -B with a number indicated pins internally shorted from the black connector to the blue connector. 3-B20 means black connector pin 3 is shorted to blue connector pin 20.
• * - Pins 5 and 7 of the black connector are not connected inside the clamshell control head.

BLUE 22 PIN CONNECTOR CLAMSHELL PINOUT (HCN1020A)
PIN #	22 pin BLACK	J1	DESCRIPTION
1		24	Mode 3
key
3		25	Mode 4
4		12	Mode 5
5-B6-B9-B19			Chassis
6		11	Mode 12 *
7		29	Mode 8
8		26	Mode 9 *
9		23	Mode 7
10		30	Mode 11 *
11		13	Mode 1
12			Handset Received Audio
key
14		16	Mode 6
15-B16			Detected Audio
16			DVP Audio In
17-B1			Switched B+
18-B22			PTT
19		19	Mode 10 *
20-B3			Speaker Audio
21			Switched Speaker Audio
22		17	Mode 2

• Any pin shown as -B with a number indicated pins internally shorted from the blue connector to the black connector. 20-B3 means blue connector pin 20 is shorted to black connector pin 3.
• * - Pins 6, 8, 10 and 19 of the blue connector are not connected inside the clamshell control head.

• All of the yellow highlighted signals do not connect to the radio. They are external power hookups, interconnections between control head boards and accessories (i.e. the hangup box).
• The clamshell control head must have its internal jumpers set correctly.

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