Kenwood TS-570D instruction manual MCP and TNC, Pin No Function

15 CONNECTING PERIPHERAL EQUIPMENT

MCP AND TNC

Use the ACC 2 connector to connect the input/output lines from a Terminal Node Controller (TNC) for Packet operation, a Multimode Communications Processor (MCP) for operation on Packet, PacTOR, AMTOR, G-TORTM, or FAX, or from a Clover interface. Also use the ACC 2 connector to connect SSTV and phone patch equipment.

•Connect the TNC or MCP to the ACC 2 connector using a cable equipped with a 13-pin DIN plug.

•Connecting the TNC or MCP to a personal computer or dumb terminal requires an RS-232C cable.

Note:

◆Do not share a single power supply between the transceiver and the TNC or MCP. Keep as wide a separation as possible between the transceiver and the computer as practical to reduce noise-pickup by the transceiver.

◆The output voltage of Pin No. 6 (SMET) is not 0 V even when no signal is present. In addition, the output voltage differs between FM (approx. 2.8 ~ 3.8 V) and other modes (approx. 0.5 ~ 3.8 V). When connecting this pin to peripheral equipment such as a personal computer, the input impedance of that equipment must be higher than 1 MΩ. If you connect to equipment having lower impedance, the S-meter will not give accurate readings.

Pin No.	Pin		Function
	Name
1	NC	Not connected
2	RTK	RTTY key input
3	ANO	AF output from receiver
		•	Connect to TNC or MCP receive data pin for digital operation.
		•	AF output level is independent of AF control setting.
		•	AF output level can be changed via Menu No. 34.
		•	Output impedance: 4.7 kΩ
4	GND	Shield for pin 3
5	PSQ	Squelch control
		•	Connect to TNC or MCP squelch control pin for digital operation.
		•	Prevents the TNC from transmitting while the receiver squelch is open.
		•	Squelch open: Low impedance
		•	Squelch closed: High impedance
6	SMET	S-meter output
7	NC	Not connected
8	GND	Chassis ground
9	PKS	Transceiver PTT line control
		•	Connect to TNC or MCP transmit/receive switching pin for digital operation.
		•	Microphone audio input is muted when the transceiver is switched to the transmit mode.
10	NC	Not connected
11	PKD	Microphone audio input
		•	Connect to TNC or MCP transmit data pin for digital operation.
12	GND	Shield for pin 11
13	SS	PTT control (in parallel with MIC jack) for connecting a footswitch or other external controller

TNC/MCP

power supply

TS-570

TNC/MCP

Personal computer dumb terminal

Black

Red

PS-53

13

9 10 11 12

5 6 7 8

1 2 3 4

ACC 2 Connector (Rear panel view)

62