Motorola APX 7000 - Maritime Radio Use in the VHF Frequency Range; Special Channel Assignments; Emergency Channel; Non-Commercial Call Channel

6-28 Troubleshooting Waveforms: GCAI
6.9.3 GPIO4
Trace 1: Trace recorded at Pin 60 of J3001.
Figure 6-26. GCAI – GPIO4 Waveform