Pin	RS-232 Signal	DB9 Signals
1	DCD	Data Carrier Detect
2	RxD	Received Data
3	TxD	Transmitted Data
4	DTR	Data Terminal Ready
5	Signal Ground	Signal Ground
6	DSR	Data Set Ready
7	RTS	Request to Send
8	CTS	Clear to Send
9	RI	Ring Indicator

Connecting the Serial Device

Connect the serial device(s) to the serial port(s) on the RocketPort USB Serial Hub III.
Disconnect the USB cable from the RocketPort USB Serial Hub III upstream port. The USB port is located next to the serial ports.
Reconnect the USB cable to the RocketPort USB Serial HubIII upstream port. The PC automatically locates and configures each serial port on the RocketPort USB Serial Hub III.

Building Null-Modem Cables

You need a null-modem cable to connect to DTE devices. For example, you can connect one end of a null-modem cable to COM2 on one computer and the other end of the null-modem cable to COM2 on another computer.

Use the following information to build null-modem cables. RS-232 Null-Modem Cable

Note
You can also attach a null-modem adapter to one end of a straight-through cable to create a null-modem cable.

Building Straight-Through Cables

Straight-through cables connect modems to other DCE devices. For example, you can connect one end of a straight-through cable to COM2 on one computer and the other end of a straight-through cable to a modem. RS-232 Straight-Through Cable

Use the following information to build straight-through cables.

Building Loopback Plugs

You can use this information to build a loopback plug that can be used to test the port using Test Terminal.

The RocketPort USB Serial Hub III uses an RS-232 female loopback plug. To build a loopback plug for the RocketPort USB Serial Hub III, wire the following pins together: RS-232 Loopback Plug

Pins 1 to 4 to 6
Pins 2 to 3
Pins 7 to 8 to 9

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