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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.
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-