home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Cream of the Crop 26
/
Cream of the Crop 26.iso
/
program
/
wsc4c21.zip
/
LOOPBACK.TXT
< prev
next >
Wrap
Text File
|
1997-03-12
|
2KB
|
39 lines
*** Making a loopback adapter ***
A loopback adapter can easily be made from a female-female adapter. Orient
the female-female adapter such that the widest part is facing up. Connect
pins 2 and 3 together with a short piece of wire (or paper clip) as shown below.
The loopback adapter can also test RTS/CTS by connecting pin RTS to CTS, as
shown in the diagram below. This is recommended since RTS/CTS are used for flow
control. The loopback adapter can also test DTR/DSR by connecting pin DTR to
DSR.
Lastly, connect the female-female adapter to the end of the modem cable, and run
SELFTEST.
Female DB 25 Female DB 9
***************************************** *****************
* 13 12 11 10 9 8 7 6 5==4 3==2 1 * * 5 4 3==2 1 *
* 25 24 23 22 21 20 19 18 17 16 15 14 * * 9 8==7 6 *
*************************************** ***************
DB 25 DB 9 Pin Definition
===== ==== ==============
7 5 Signal Ground (SG)
2 3 Transmit Data (TD)
3 2 Receive Data (RD)
20 4 Data Terminal Ready (DTR)
6 6 Data Set Ready (DSR)
4 7 Request to Send (RTS)
5 8 Clear to Send (CTS)
8 1 Carrier Detect (CD)
(Note: The pin positions are reversed for male connectors)