Compaq C180, C240, C200 Serial Input/Output Connectors, Serial I/O Pins Pin No Signal Description

Product Information

System Unit Rear Panel Connectors

Serial Input/Output Connectors

There are a variety of pointing devices (mouse or trackball) or peripheral devices that can attach to the Serial Input/Output (SIO) ports on the worksta- tion. Peripheral devices include printers, plotters, modems, and scanners. Consult the documentation that accompanies each peripheral device for spe- cific information concerning its use.

The SIO ports are programmable, allowing functions such as bit rate, char- acter length, parity, and stop bits to be set. The SIO Ports are used as inter- faces for serial asynchronous devices to the CPU. The ports operate at up to a 460.8 K baud rate.

Table 5 shows the SIO connector pin listings. The serial connectors are 9-pin D-sub connectors. Signal names are those specified in the EIA RS-232 stan- dard.

Table 5	Serial I/O Pins
	Pin No.	Signal	Description
	1	DCD	Data Carrier Detect
	2	RXD	Receive Data
	3	TXD	Transmit Data
	4	DTR	Data Terminal Ready
	5	GND	Ground
	6	DSR	Data Set Ready
	7	RTS	Request To Send
	8	CTS	Clear To Send
	9	RI	Ring Indicator

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