Silex technology SX-550 Serial Ports, Logical Serial Port Signal Descriptions Pin Input/Output

Serial Ports

The two serial ports can be accessed with RS-232 signals, via the DB-9 connectors, or logic signals, via the 10-pin headers.

The two logical serial port headers are located at JP2 and JP6. The serial ports provide four dedicated signals and three optional signals. The optional signals are configured using jumpers. Table 5 details the serial port signal descriptions.

Table 5 Logical Serial Port Signal Descriptions

Pin	Signal	Input/Output	Pin	Signal	Input/Output
1	DCD	Input	2	DSR	Input
		Enabled via header			Enabled via header
3	RXD	Input	4	RTS	Output
5	TXD	Output	6	CTS	Input
7	DTR	Output	8	No
		Enabled via header		Connect
9	GND		10	3.3V

All signals are 0 to 3.3 V logic signals.

To use header JP2, disable the RS-232 transceiver, U3, by placing a jumper on both JP8 pins. To use header JP6, disable the RS-232 transceiver, U6, by placing a jumper on both JP9 pins.

Using the Optional Serial Signals

Signals GPIO 1 to 6 can be used as GPIO or Serial Port control signals DTR, DSR and DCD.

To configure signals DTR, DSR and DCD, place a jumper between JP4 and JP5 for that signal, as shown in Figure 7.

GPIO1	GPIO2	GPIO3	GPIO4	GPIO5	GPIO6
					JP3
					JP4
					JP5
DTR1	DSR1	DCD1	DTR2	DSR2	DCD2

Figure 7 Optional Serial Signals

SX-550 Evaluation Daughtercard	silex	Page 13
Hardware Configuration
	Part Number 40183-101