RM420-122 Mic/Headphone/GPIO Module, 4 channels
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RM420-122 Mic/Headphone/GPIO Module, 4 channels

Figure 6: RM420-122 Mic/Headphone/GPIO module, pin assignment.
Figure 7: RM420-122 Mic/Headphone/GPIO module, wiring example 1.
Figure 8: RM420-122 Mic/Headphone/GPIO module, wiring example 2.
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RM420-111 Digital In/Out/GPIO Module, 8 channels  RM420-123 Mic/Line/GPIO Module, 4 ch. isolated