I just installed a Nexdome rotator motor and it uses a USB cable to connect to the computer. I am using a MacBook with the OS X version of KStars (3.4.3).
INDI recognizes the rotator firmware, but then the handshake fails.

s.indi] - NexDome : "[DEBUG] Connecting to /dev/cu.usbmodem14101 @ 9600 "
[2020-09-17T08:35:26.991 MDT DEBG ][ org.kde.kstars.indi] - NexDome : "[DEBUG] Port FD 3 "
[2020-09-17T08:35:26.991 MDT DEBG ][ org.kde.kstars.indi] - NexDome : "[DEBUG] Connection successful, attempting handshake... "
[2020-09-17T08:35:26.993 MDT DEBG ][ org.kde.kstars.indi] - NexDome : "[DEBUG] CMD <@FRR> "
[2020-09-17T08:35:26.993 MDT DEBG ][ org.kde.kstars.indi] - INDI Server: "2020-09-17T14:35:26: Driver indi_nexdome: Handshake lines currently set to 6"
[2020-09-17T08:35:26.993 MDT DEBG ][ org.kde.kstars.indi] - INDI Server: ""
[2020-09-17T08:35:27.049 MDT DEBG ][ org.kde.kstars.indi] - NexDome : "[DEBUG] RES <:FR3.3.0> "
[2020-09-17T08:35:27.050 MDT INFO ][ org.kde.kstars.indi] - NexDome : "[INFO] Detected rotator firmware version 3.3.0 "
[2020-09-17T08:35:27.051 MDT DEBG ][ org.kde.kstars.indi] - NexDome : "[DEBUG] CMD <@FRS> "
[2020-09-17T08:35:30.057 MDT INFO ][ org.kde.kstars.indi] - NexDome : "[ERROR] Serial read error: Timeout error. "
[2020-09-17T08:35:30.057 MDT DEBG ][ org.kde.kstars.indi] - NexDome : "[DEBUG] Handshake failed. "
[2020-09-17T08:35:30.058 MDT DEBG ][ org.kde.kstars.ekos] - "NexDome" is disconnected.
[2020-09-17T08:35:30.058 MDT INFO ][ org.kde.kstars.ekos] - "NexDome is disconnected."

I can use the manual buttons on the motor itself to move it, so It works. The issue is just the USB connection to INDI.

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