How are IP-223s interfaced with Tone Controlled Radios?

Answer

In 2 wire mode the wires are connected to the DB-25 connector at pins 13 and 25. In 4 wire mode the TX pair is connected to DB-25 pins 13 and 25, and the RX pair is connected to pins 12 and 24.

The corresponding radio connections will be specified by the manufacturer. Some models have built in tone remote adapter boards, and some may require a tone remote adapter board between the IP-223 and the radio.

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