RocketPort Jet Cabling

DB9 Null-Modem Cable

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 pin-outs 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. DB9 Null-Modem

[Note]
Note

Use the P1 Pin 9 Jumper to determine which signal appears on Pin 9 of the DB9M connector (2-port or 4-port).

RJ45 connectors are not standardized. Refer to your serial device documentation for signal information.

DB9 Straight-through Cable

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. DB9 Straight

[Note]
Note

Use the P1 Pin 9 Jumper to determine which signal appears on Pin 9 of the DB9M connector (2-port or 4-port).

RJ45 connectors are not standardized. Refer to your serial device documentation for signal information.

RJ45 Connector

Use the jumper setting page for cabling information with the serial device documentation for cabling information.

Loopback Plugs

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.

  • Pins 1 to 4 to 6

  • Pins 2 to 3

  • Pins 7 to 8 to 9

DB9 Loopback Plug


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