M20 Hardware Design
Figure 19: Seiko XH414H-IV01E charging characteristic
3.9 Serial interface
The module provides two unbalanced asynchronous serial ports, serial port0 and serial port1. The
module is designed as a DCE (Data Communication Equipment), following the traditional
DCE-DTE (Data Terminal Equipment) connection. The module and DTE are connected through
the following signal in Figure 20.
M20_HD_V1.01 - 43 -
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