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Send analog audio through the rs232 port of a data ...
https://electronics.stackexchange.com/questions/212436/send-analog-audio-through-the-rs232-port-of-a-data-transmitter#:~:text=If%20you%20use%20a%20PWM%20frequency%20that%20is,send%20that%20PWM%20signal%20using%20the%20RS-232%20transmitter.
Send analog audio through the rs232 port of a data ...
https://electronics.stackexchange.com/questions/212436/send-analog-audio-through-the-rs232-port-of-a-data-transmitter
If you use a PWM frequency that is well above the highest audio frequency of interest, convert the analog audio level to the width of each pulse (using a ramp generator and comparitor or microcontroller probably), send that PWM signal using the RS-232 transmitter.
AUDIO / RS232 over IP PoE Transceiver - Muxlab
https://muxlab.com/pro-digital/audio-rs232-ir-over-ip-extender-with-poe
AUDIO / RS232 over IP PoE Transceiver. The AUDIO / RS232 over IP PoE Transceiver is an extender that allows 2CH audio signals to be extended up to 330ft (100m) via Cat5e/6 cable in a point-to-point configuration. Point-to-multipoint and multipoint-to-multipoint is supported by connecting several Transceivers to the same local Ethernet network.
RS232 - Sending commands when checksums are required
https://support.denon.com/app/answers/detail/a_id/88/~/rs232---sending-commands-when-checksums-are-required
To send this command and activate Play on our DVD player, the complete hex string would look like 02 40 00 00 00 00 03 34 33 as indicated in the protocol document. A BD hex string would add an additional place holder. (ie: 02 40 00 00 00 00 00 03 34 33) Now let's explain how we got there. The 02h starts the transmission, 40h is the play command itself, 00h 00h 00h 00h are four …
Audio Out Over UART - Hackaday
https://hackaday.com/2016/04/11/audio-out-over-uart/
In this post, Tiziano is using PWM (Pulse Width Modulation) through the 1 TX line of the RS232. The 8 bits of each byte he is sending, represents the 8 levels of voltage possible.
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