Serial Ports
These ports support external devices such as modems and scanners that require serial data transmission.
1 5
6 9
OM00932A
Pin Signal
1DCD (data carrier detect)
2RXD (receive data)
3TXD (transmit data)
4DTR (data terminal ready)
5GND (ground)
6DSR (data set ready)
7RTS (request to send)
8CTS (clear to send)
9RIA (ring indicator)
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