# Serial Port Loopback (9 CheckIt)

Used to verify that a port is working. This one works with CheckIt.

(To Computer).

9 PIN D-SUB FEMALE to Computer.

Name | Pin | Pin | Name
--- | --- | --- | ---
CD | 1 | 6 | DSR
CD | 1 | 9 | RI
RXD | 2 | 3 | TXD
DTR | 4 | 6 | DSR
RTS | 7 | 8 | CTS

Contributor: Joakim Ögren, "Coolsys"

Source:
?

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08