If you do turn USB SERIAL on, the TV will no longer respond to commands on the 3.5mm EX-LINK jack. My understanding (although I haven't tested it) is that with a USB to EX-LINK adapter you can bump it to 115200 Baud,8,N,1. If you are using an actual 3.5mm to DB9 cable, 9600 Baud,8,N,1 worked for me.
On the other hand, if you are using a USB to EX-LINK adapter (plugged into the USB port on your TV) you will need to enable the USB SERIAL option in the service menu. as Duct Tape mentions, on this 2019 TV at least, there is no need to enter the service menu to get EX-LINK to work as long as you are using an actual 3.5mm to DB9 EX-LINK cable. I did not agree to the terms and conditions and left the "smart" features disabled, so this is not a requirement.
I did end up doing a firmware update as part of my troubleshooting, but I'm not sure it was necessary. I think I did need to turn off AnyNet+ (HDMI-CEC) in the regular TV Settings menu. EX-LINK was enabled out of the box on my 2019 Q70R 55" (RS-232 Jack was set to UART and EXT Link Support was ON). A key point here is that the correct settings are different depending on whether you are using a traditional 3.5mm-DB9 Serial EX-LINK adapter or a USB-EX-LINK adapter (or, in other words, if you're plugging into the 3.5mm EX-LINK jack or the USB port on the TV).
Here are some notes which would have saved me a lot of time in case they are helpful to anyone else. Thanks to Duct Tape and others for all the community support on this thread so far, and thanks in advance to anyone that might be able to get me unstuck.Īfter a bunch of trial and error I have just succeeded in getting full EX-LINK serial control working on my 2019 Samsung Q70R 55". If someone has those, that might help me solve my problem. I posted the same to the Samsung support community forum, but it doesn't look like that site gets much traffic and I haven't heard any replies.Īlso, I sometimes get response codes from commands even though they don't work, but I haven't seen any docs on what those mean. This tells me that my connection is good, at least for traffic *from* the TV. I also set RS-232 Jack to DEBUG, and received lots of console traffic at 115200 baud (normal for debug mode, but not normal "ON" mode), but it didn't respond to anything I tried to type. Hotel/Hospitality Mode: Hospitality mode on or off makes no difference Details below:Ĭonnectivity: 9600 baud, 8 bit, no parity, 1 stop bit, no hardware flow control I'd love some help figuring out what I'm doing wrong. I can turn it on, but no other command is responsive. Like lucastx, I'm having a terrible time trying to control the TV via Ex-Link. I have a 2017 Samsung QLED TV (QN75Q70RAF).
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