# Serial Port Loopback (25 CheckIt)

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

(To Computer).

25 PIN D-SUB FEMALE to Computer.

Name | Pin | Pin | Pin | Pin
--- | --- | --- | --- | ---
Jumpering 1 | 2 | 3 |  |
Jumpering 2 | 4 | 5 |  |
Jumpering 3 | 6 | 8 | 20 | 22

Contributor: | Joakim Ögren, "Coolsys"

Source: | ?

Copyright © The Hardware Book Team 1996-2004.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2002-01-10