Silex technology SX-550 manual RS-232 Cable, Additional OEM Interface Signals

GPIO

LED

GPIO_10

D3 green

RS-232 Cable

The supplied DB-9 female-to-female null modem cable is wired as shown below.

Figure 9 RS-232 Cable Pinouts

Table 10 RS-232 Cable Pinout Description

Pin	Description
1	DCD (Data Carrier Detect) Input
6	DSR (Data Set Ready) Input
2	RxD (Receive Data) Input
3	TxD (Transmit Data) Output
4	DTR (Data Terminal Ready) Output
7	RTS (Request To Send) Output
8	CTS (Clear To Send) Input
5	Ground

Additional OEM Interface Signals

The output LED signals ORLED-, GRLED- and YELED- represent the state of the LEDs on the module. Logic 0 indicates the LED is on, and Logic 1 indicates the LED is off. Buffers are recommended if LEDs are to be driven on the end-user side.

The SWITCH signal is connected to a momentary pushbutton switch on the evaluation daughtercard and is in the normally open position. Depressing the switch causes a short to ground. A 4.7 K-ohm pull-up resistor to +3.3 VDC is connected. The module’s processor monitors this signal. The end-user can drive or use open-collector to this signal to either logic level or can monitor this signal as an input.

SX-550 Evaluation Daughtercard	silex	Page 17
Hardware Configuration
	Part Number 40183-101