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loopback.doc
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1997-03-15
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*** 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 as shown below.
In order to test the DTR & DSR lines, connect the DTR pin to the DSR pin.
Similiarly, connect the RTS pin to the CTS pin to test the DTS & CTS lines.
The diagram below shows the recommended connections:
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.