Radio-TNC Wiring Diagrams

For radio models: Azden, Kenwood, Yaesu (rear panel data connector)

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Manufacturers have been known to change their usage of pins, please compare diagrams shown with the product's manual. Pins not shown may be used for other functions. Damage may occur if wrong connections are made.

Pins are labeled with the number of the pin, followed by the descriptive name used in Chapter 5 of What is your TNC doing?

6-pin Mini DIN

Azden, Kenwood, Yaesu

diagram
Pin 1 - Transmit Signal
Pin 2 - Ground
Pin 3 - PTT
Pin 4 - Receive Signal (9600 baud)
Pin 5 - Receive Signal (1200 baud)
Pin 6 - External Carrier Detect (optional)

Note 1: This connector may require a high output drive level from the TNC.

Note 2: Some radios may require you to select Pin 4 or Pin 5 for the Receive Signal. This is sometimes done through a menu selection. Other radios may always have both pins active so that no selection is necessary. Bandwidth is the main difference between the 1200 and 9600 baud Receive Signal connections - 9600 baud requires a wider receive filter than 1200 baud. Both speeds can be received on Pin 4; however 1200 baud may have more noise than normal.

Note 3: Pin 5's Receive Signal may be unsquelched audio. Pin 4's Receive Signal is unsquelched audio. Many TNCs are defaulted to accept squelched audio for 1200 baud. With unsquelched audio, the TNC will always be receiving noise and must be able to detect packet signals out of the noise. This is often accomplished with a TNC command for carrier detect or with an optional hardware DCD circuit. Unsquelched audio is standard for 9600 baud receive.

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