Testing DB-9 serial ports in HyperTerminal

Making external connections

Tripp Lite USB to Serial Adapter User’s Manual

Figure 39 illustrates the RS- 232C pinouts for typical DTE- to-DCE and DTE-to-DTE (null modem) cables with 25-pin connectors.

Figure 39 - Cabling requirements for RS-232C devices

Testing DB-9 serial ports in HyperTerminal

This section explains how to test the functionality of your USB serial adapter using Hyperterminal. Follow the directions under Running Hyperterminal below.

Running Hyperterminal

Note: Use the DB-9 loopback connector that shipped with your USB to Serial Adapter.

This procedure explains how to troubleshoot RS-232 DB-9 serial ports using Hyperterminal.

Before testing your serial ports, you must first hook up a loopback. A loopback connects the output signal (TxD) to the input signal (RxD) in a single serial port connector to make it seem like there are two ports connected together.

A loopback connector shipped with your USB adapter. Use it to test each individual serial port in Hyperterminal.

Step		Procedure	Description
!	Step 1	Launch HyperTerminal.	In Windows, select Programs/
			Accessories/ Communications/
			HyperTerminal.

!	Step 2	Connect the loopback connector to the	You will need to test each port
		port you wish to test.	individually.
!	Step 3	Create a new session.	When prompted, give the session any
			name you wish.

!Step 4 Select the COM # associated with the port you are testing from the drop down list.

You are now set up to test that serial port.

Note: Leave all settings at default.

!Step 5 With the session open, type any text.

If the text you type is echoed on the screen, the port is functioning properly.

!Step 6 Close the session.

!Step 7 Repeat steps 2 through 6 for each serial port in turn.

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U209-004 specifications

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