Hopefully this will save others hours/ days of time.
Confirms this works for HD1024/5 and XT1144/5 players.
If using an LS424/5 player use Port 2. The documentation is wrong saying that the USB enumerates to Port 0 on these players using the USB-C to USB-A and 3.5MM Serial Out dongle. Also, the serial out of this dongle does NOT work at this time. But if you connect something like a Sabrent USB to DB9 Serial Adapter to the USB-A connection on the dongle then the LS424/5 will send out serial controls.
I recommend using screw terminal 3.5mm connectors, and if using an LS424/5; BTX Technology screw terminal DB9 connectors. Commercially labeled serial cables are unreliable.
Please Note: ELO screens use a straight-through cable:
Rx to Rx / Tx to Tx / Gnd to Gnd
Only these three conductors are needed. If you're using the 3.5mm output from the player, connect Rx to the TIP, Tx to the RING, and Gnd to the SLEEVE. On the screens they use a 3.5mm input, so match Rx to the TIP, Tx to the RING, and Gnd to the SLEEVE.
For the BA Connected project:
PRESENTATION SETTINGS > CONNECTORS > SERIAL
PORT:
0 (FOR 3.5MM / PORT 2 FOR USB)
PROTOCOL:
BINARY
BAUD RATE:
9600
DATA BITS:
8
PARITY:
NONE
STOP BITS:
1
IN A PROJECT, ADD TO ANY ACTION/ EVENT HANDLER:
ADVANCED > COMMAND
COMMAND:
SEND > SERIAL BYTES (COMMA SEPARATED)
PORT:
0
BYTES:
2,110,133,255,4,214,0,1,205,3 [THIS IS FOR POWER ON]
2,110,133,255,4,214,0,5,209,3 [THIS IS FOR POWER OFF]