Help & Tips

USR-TCP232-302 Setup

Connecting the USR-TCP232-302 RS-232 to Ethernet converter for use with CAV 6 Control

The device

The USR-TCP232-302 is a compact RS-232 to TCP/IP converter that bridges your Russound CAV6.6 controller's serial port to your home network. It's an affordable and reliable choice for use with CAV 6 Control.

Purchase the USR-TCP232-302

Available on Amazon:

Buy on Amazon →

Required: Null Modem Cable

You'll need a null modem cable (DB9 male-to-male, crossover wiring) to connect the USR-TCP232-302 to the Russound CAV6.6 controller's RS-232 port. A standard straight-through serial cable will not work.

Purchase a Null Modem Cable

A short 1.5 ft cable works well for connecting directly to the controller:

Buy on Amazon →

Settings

Access the USR-TCP232-302's web interface by entering its IP address into a browser on the same network. Use the following settings to configure it for CAV 6 Control:

USR-TCP232-302 Current Status screen — **Current Status** — confirms the device is online and shows its IP address and connection state.

USR-TCP232-302 Local IP Configuration screen — **Local IP Config** — set a static IP address so the device always has the same address on your network. Enter this address in CAV 6 Control under Settings → Network & Controllers.

USR-TCP232-302 Serial Port settings screen — **Serial Port** — set baud rate to **19200**, data bits 8, parity **None**, stop bits 1. This matches the Russound CAV6.6 RNET protocol.

USR-TCP232-302 Expand Function screen — **Expand Function** — configure the TCP server mode and TCP port number. Note the port number — you'll enter it in CAV 6 Control under Settings → Network & Controllers.

USR-TCP232-302 Misc Config screen — **Misc Config** — additional system settings. Leave defaults unless you have a specific reason to change them.

Connecting to CAV 6 Control

Connect the USR-TCP232-302 to your network via Ethernet.
Connect the null modem cable between the USR-TCP232-302's DB9 port and the first Russound CAV6.6 controller's RS-232 port.
The CAV6.6 unit has both a front and a rear RS-232 port. Ensure that the cable is plugged into the correct port, which is determined by the switch on the CAV6.6 unit.
In the CAV 6 Control iPhone App, open Settings → Network & Controllers and enter the device's static IP address and TCP port.
Make sure your iPhone and the USR-TCP232-302 are on the same Wi-Fi network.