Serial Port (I/O USB Bridge)

The RS-232 Serial Port component allows you to make a connection to the RS-232 connector on a USB Video Bridge for Lua Scripting. When a connection is made, and an appropriate Lua script written, you can control and read from devices such as DVD players, recording hardware, video, lighting, and so on.

Pinout

  • Pin 2 - RX (Receive)
  • Pin 3 - TX (Transmit)
  • Pin 5 - GND (Signal Ground)
  • All other pins on a Core are not supported
  • Pin 4 on an I/O-22 provides +5.5VDC @ 70mA (not on any other Q-SYS product, though)

This signal to DE-9 configuration is known as DTE. All 9-pin D-Shell RS-232 pinned as DTE have this configuration. All PC serial ports are DTE as is the Core, I/O-Frame and I/O-22. Usually peripherals are DCE, which reverses the receive and transmit pins, allowing a straight-thru cable to be used.

You must check the pinout of any equipment, including the cable, to be connected to a Q-SYS serial port for input or output. Many times in serial troubleshooting, problems may be solved by inserting a "null-modem" adapter or cable to swap the TX and RX pin positions. For custom terminated DE-9 connectors, pins 2 and 3 may need to be swapped on one end of the cable. In any case, a TX pin on one end MUST be connected to an RX pin on the other and vise-versa for data to flow properly

Inputs

There are no input pins available for the Serial Port component.

Outputs

Serial Port - Connects to the Control Script, Command Buttons, and Text Controller components. These components must be configured for Serial Port input. Serial ports are represented by the following symbol , and wiring is represented by a thin black line.

Tip: For additional properties not listed, refer to the Properties Panel help topic for more information.

The Serial Port has no unique Properties.

TX Bytes

Displays a running total of the number of bytes sent.

RX Bytes

Displays a running total of the number of bytes received.

Reset

Resets both TX Bytes and RX Bytes to zero.

The available Control Pins depend on settings in Properties.

Pin Name

Value

String

Position

Pins Available

Receive Bytes

Text Box

Output

Reset

Trigger

Input / Output

Transmit Bytes

Text Box

Output