RS-232 Serial Port Component

The RS-232 Serial Port component allows you to make a connection to the RS-232 connector on a Core, I/O Frame, or the I/O-22 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.

Inputs

RS-232 Serial Port - Serial port data to and from the RS-232 connector on the Core, I/O Frame or the I/O-22.

Outputs

Serial Port - Connects to the Control Script, Command Buttons, and Scriptable Controls components.

Controls

Control	Function	Default/Range
TX Bytes	Displays a running total of the number of bytes sent.	N/A
RX Bytes	Displays a running total of the number of bytes received.	N/A
Reset	Resets both TX Bytes and RX Bytes to zero.	N/A

Properties

The Properties listed below are specific to the RS-232 Serial Port component. The other Properties available when the RS-232 Serial Port is selected are related to the Core, I/O Frame, or the I/O-22, and are listed in the individual Status topics.

Property	Function	Choices
Name	Text name identifying the RS-232 Serial Port component.	User defined
Serial Port	Identifies which serial port you are communicating through.	0 to 4

Control Pins

The available Control Pins depend on settings in Properties.

Pin Name	Value	Pins Available
Reset	Trigger	Input/Output
Receive Bytes	Text Box	Output
Transmit Bytes	Text Box	Output

RS-232 Details

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.

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