B&B Electronics 3PCIOU1 Spécifications télécharger pdf (Page 57)

Document Number 3PCI-4310m Appendix D D-1

Figure 33. RS-232 Loopback w/Handshaking Connections

2. From the Windows Desktop click Start → Programs → B&B Electronics

→ ComTest → ComTest.

ComTest will start and then open the Select Port dialog box.

3. Select the COM port you want to access or test. (The drop down box shows

available ports that are not currently in use).

4. Click OK. The Configure Port dialog will appear.

5. Select the desired baud rate, parity, data bits, stop bits. (Defaults are

common settings).

6. Type characters. They will appear in the upper window.

If you are performing a loopback test, you should see the characters appear

in the lower window as they are received.

7. On the Option menu, click DTR to assert or de-assert the DTR hardware

handshake line. The DTR indicator at the bottom of the window will be red

when asserted.

If DTR is looped back to DSR and DCD their indicators should also be red.

8. On the Option menu, click RTS to assert or de-assert the RTS hardware

handshake line. The RTS indicator at the bottom of the window will be red

when asserted.

If RTS is looped back to CTS, the CTS indicator should be red.

9. When testing is completed, close the program.

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B&B Electronics 3PCIOU1 Spécifications Page 57