JHCTech WPPC-H1780T User Manual page 31

Serial Port 1 Configuration: Serial Port 1 Settings
Serial Port 2 Configuration: Serial 2 Settings
Serial Port 3 Configuration: Serial Port 3 Settings
Serial Port 4Configuration: Serial Port 4 Settings
8-bit TTL GPIO input and output settings
Serial Port 1 Configuration
Figure 3.5
Figure 3.6
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User's Manual