QOMO QD3300 - Manual (Page 19)

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Then use buttons on the operation panel to control the projector.
The visualizer provides a 6-pin to 9-pin RS232 cable. If this cable does not
match to your projector’s RS232 port, an additional RS232 cable is needed.
This additional RS232 cable can be made based on the pin location of the
projector’s RS232 control port. The pin locations of the visualizer are: the
pin 1 is RXD (Received Data); the pin 5 is TXD (Transmitted Data); the pin
4 is GND (Ground). Other pins are not defined. The pin location information
of the projector is provided by the projector’s manufacturer. The projector’s
RS232 control port normally has RXD pin, TXD
pin and GND pin, the name may be different. The
parallelism of each data pin is shown as follows:
Visualizer’s RXD pin------------Projector’s TXD pin
Visualizer’s TXD pin------------Projector’s RXD pin
Visualizer’s GND pin------------Projector’s GND pin
5. If you can not use buttons on the operation panel to control the projector,
please use Code-Writing software’s projector control code testing function
to check if the control code is correct.
Click “Projector” button, the following dialog box appears as below:
Connect the visualizer to a computer with a RS232 cable (Please
disconnect the projector from the RS232 port first) and select the Baud
Rate and Parity based on the projector’s Baud Rate, then click the “TEST”
button to pop up the Projector Code Test dialog box, input the Baud Rate
and Parity based on the projector’s Baud rate, then click “Open”.
6 5
4 3
2 1