Forum dedicated to discussion on RELM/Regency/Wilson Radio products
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The schematic diagram in the manual doesn't show the pin numbers. The pins are labled TXD1, RXD1, AUX5, DEO, DI, ALT, 5V, E, AUX1, AUX3, AUX4, AUX2 DTMFIO, TXD0, RXD0. If you start at the middle pin, should be pin 8, it is ground. The AUX lines are configured in the programming software.
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