Trying to get serial port working for communication with alarm system

Setup, Configuration and Use Beginners
1

I’ve migrated from Windows OH2 to RPi4 OH3, and the serial port interaction is a little different than I’m used to. On Windows, I simply had this line in an items file:
String NX8V2_Panel “Security System” (Security) {serial=“COM4”}

Does anyone know how I can tell what serial port I’m connected to on RPi? My ZWave device is connected to /dev/ttyACM0. I have a rule already that triggers on “Item NX8V2_Panel received update”, which reads the buffer via NX8V2_Panel.status, and sends commands via NX8V2_Panel.sendCommend, so the one item takes care of all the 2-way communication with the alarm panel.

Do I need to be concerned with the config menu? i.e.:
(all RPi) Disable serial console to give room for HATs
(RPi3/4) move Bluetooth to mini UART

Thanks,
Neil

2

I got a little further. I figured out that /dev/ttyUSB0 is the port in question. I can use the “screen /dev/ttyUSB0” command in Linux to get feedback from the alarm panel, so I know that part is working. Yet, in OH3, the serial port buffer doesn’t seem to be getting any data back. My items file now reads:

String NX8V2_Panel “Security System” (Security) {serial="/dev/ttyUSB0@9600"}

Is there some configuration I need to make in OH3 to get it to communicate over this serial connection? This worked in OH2 on Windows, sigh…

Thanks,
Neil

3

Your item definition is refering to the OH 1.x serial binding which is no longer supported in OH 3.x.

There is an OH 3 version of the serial binding so you will need to read the documentation and update your config for the new binding.

1 Like
4

Well, that’ll do it! Nice catch. Thanks.