B&B Electronics USR604 - Manual - Manual (Page 41)

Section 8 - Appendix
Page 41 of 45 Document Number: USR60x-0812m
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8. Set the serial port to RS-232 mode by switching both associated DIP
switches to Off.
9. Plug a loopback plug into the DB9M connector associated with the
serial port to be tested.
10. Type some characters on the PC's keyboard.
The characters should appear on the HyperTerminal window.
Figure 26: Successful Hyperterminal Port Test
11. Remove the loopback plug and type more characters.
No additional characters should appear on the HyperTerminal
window.