External Interfaces

Using Control Pins

As described in Serial Port Signals and Pin Assignments, 9-pin serial ports include six control pins. These control pins allow you to:

• Signal the presence of connected devices
• Control the flow of data

The properties associated with the serial port control pins are given below.

Table 10-11: Control Pin Properties 

Property Name	Description
DataTerminalReady	Specify the state of the DTR pin
FlowControl	Specify the data flow control method to use
PinStatus	Indicate the state of the CD, CTS, DSR, and RI pins
RequestToSend	Specify the state of the RTS pin

Example: Using Events and Callbacks

Signaling the Presence of Connected Devices

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