B&B Electronics 3PCIU4 - Manual (Page 89)

Troubleshooting with ComTest
Manual Documentation Number 3PCIoUx-1008 Appendix C C-1
Figure 62. 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.