SATEL-TR4+
Integration Guide, Version 1.6
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4.9
UART pins
Pins 7, 8, 9, 10 are used for UART serial transmission between the module and the terminal. The
UART signal level corresponds to the level in VCC_IO pin. VCC_IO pin must be fed with a correct
voltage level to match the terminal device.
4.10
GPIO pins
GPIO pins are reserved pins for future use or special applications or special features. Unused pins
should be left unconnected.