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All BrightSign players offer serial I/O for diagnostic and interactive capabilities. Many models have a dedicated serial port (either DB9 or 3.5mm) to enable serial communication. This page outlines how to configure the player and host device for serial communication.
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While the USB port can be used to send serial commands (for example, to control certain monitors), console functionality is only available through the DB9 or 3.5mm jack.
Signaling Settings
The following are the default serial settings for a BrightSign player. They can be changed in BrightAuthor or BrightScript.
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By default, DTE and DCE devices can only speak to their opposite. If the BrightSign player and the intended interface device are of the same type (both DTE or both DCE), a null-modem cable or converter can be used to transpose TX/RX signals to allow communication.
3.5mm Serial
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The UART (asynchronous serial) interface is a 3.5mm (1/8") jack that uses RS-232 levels for communication*. The receiver will tolerate input voltages between -30V and +30V, with anything below 3V interpreted as logical 1. The transmitter drives +8V for logical 0 and -8V for logical 1.
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BrightSign players are DCE devices, so communication with another DCE device that uses a 3.5mm port would require a null-modem cable or converter that transposes the TX/RX signals. If the device communicating with the player is a DTE device with a DB9 serial port (performing asynchronous transmission), the serial cable should be wired as shown in the following diagram:
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DB9 RS-232 Serial
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The catalog of BrightSign players is diverse. While this information holds true for the majority of DB9 enabled devices, the following are exceptions: HDx20
The RS-232 interface is a male DE-9 (more commonly referred to as DB-9) connector. The input to the chip accepts a range between +25V and -25V, so it is compatible with +12V/-12V signaling.
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