Cabling

Use the following figure if you need to build an RS-232 null-modem cable. A null-modem cable is required for connecting DTE devices.

If you need RTS-CTS/DTR-DSR hardware flow control, you can use the pinouts provided in the following example.

You may want to purchase or build a straight-through cable and purchase a null-modem adapter.

For example, a null-modem cable can be used to connect COM2 of one PC to COM2 of another PC.

Use the following figure if you need to build an RS-232 straight-through cable.

Straight-through cables are used to connect modems and other DCE devices.

For example, a straight-through cable can be used to connect COM2 of one PC to a modem.

You can use test terminal and a loopback plug to test the serial ports. The RocketPort Jet was shipped with a a single loopback plug (RS-232).

Wire the following pins together to build additional plugs or replace a missing RS-232 loopback plug.