Hardware interfaces, Power connector, De9 rs-232 serial – BrightSign 4K242 Hardware User Manual
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BrightSign 4K242, 4K1042, 4K1142
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All information provided in this reference manual applies to products under development. The characteristics and specifications of these products are subject to
change without notice. BrightSign assumes no obligation regarding future manufacturing unless otherwise agreed to in writing. © BrightSign LLC, 2015
HARDWARE INTERFACES
This section describes the characteristics and operation of all connectors on 4K models.
Power Connector
The power connector for 4K players is rated for 12V @ 5A. The plug is a right-side positive, keyed and locking 4-pin
connector.
DE9 RS-232 Serial
The RS-232 interface is a male DE9 connector. The BrightSign 4K player is a DTE device, similar to a PC. The input to
the chip accepts a range between +25V and -25V, so it is compatible with +12V/-12V signaling.
The baud rate of the RS-232 interface (which is controlled by system software) is 115200, with no parity, 8 data bits, and
1 stop bit. The RS-232 interface supports RTS/CTS hardware flow control, but no software flow control. The maximum
cable length is 50 meters, and the total cable capacitance is 2500pF.
Note: A lower capacitance cable allows you to use cable lengths beyond 50 meters.
The following diagram illustrates the behavior of the TX and RX signal: