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<strong>TTP</strong>-<strong>245</strong> / <strong>TTP</strong>-<strong>343</strong><br />
2.11. Serial Interface Circuit<br />
Fig. 2.11 Serial Interface Circuit Diagram<br />
RS-232 is an asynchronous transfer interface, which used with externally connected<br />
personal computer and keyboard unit. JP15 connects to PC serial interface through the<br />
RS-232 cable. RxD is a data receive pin of MCU. CTS is clear to send of MCU, which<br />
sends a signal from the external device. TxD is a data output pin of MCU. RTS is the<br />
request to send signal, which sends signal to the external device.<br />
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