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The RS-232 serial interface is a 3.5mm (1/8") jack. The HD1023 XD1033 player is a DTE device, similar to a PC. The input to the chip accepts a range between +30V and -30V, so it is compatible with +12V/-12V signaling. The output ranges from 5V to 0V.
The default baud rate of the RS-232 interface is 115200, with no parity, 8 data bits, and 1 stop bit. These settings can be configured in the software. The serial interface supports TX, RX, and ground only—RTS/CTS hardware flow control is not supported.
A serial cable plug that is inserted into the 3.5mm jack should use the following signaling:
- Tip: Transmit
- Ring: Recieve
- Sleeve: Ground
The following diagram illustrates the behavior of the TX and RX signal:
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