Transparent network-to-serial bridge: Link two connections and this machine becomes a serial device server — a program on the network reads and writes the local serial port directly, while both sides of the traffic stay visible on screen. A fast network feeding a slow port is throttled automatically, and whatever still has to be dropped is counted in red until you clear it. Several clients can be handled exclusively, by broadcast, or by taking turns; an address allowlist keeps strangers out, both directions can be recorded into one time-ordered capture file, and a two-minute traffic curve shows how the link is doing
RFC 2217 and Modbus gateway: Two new protocol modes for the bridge. RFC 2217 lets a remote machine set the baud rate, data format, flow control and control lines as if the port were local; the Modbus gateway converts frames between TCP and RTU, and when several masters share one RS-485 bus it serves them one at a time so every answer goes back to whoever asked
Selectable wire encodings: Each connection can use its own receive and send encoding (UTF-8, GBK, GB18030, Big5, Shift-JIS, Latin-1, System and more), so a device that speaks GBK no longer arrives as mojibake. Both the settings dialog and the quick-settings panel can change it, and the choice is stored with your settings, the .spu project file and the cloud snapshot; terminal typing and cloud remote send follow the owning connection's encoding too
Drag the split between connections: The boundary between connections can be dragged, so a busy connection can be given more room; the proportions you drag survive toggling the quick-settings panel
Custom CRC: The toolbox accepts custom CRC parameters, and the result can be fed straight into the send frame
Configurable Enter sequence: The bytes sent by Enter in terminal mode are now yours to choose
Online help center: The Help menu links straight to the online help center
Restore defaults: Added a guarded workflow for restoring default settings
Microsoft Store: MSIX packaging is in, so the app can be installed from the Microsoft Store
UI Improvements
Bridge editor: The six setting groups became three tabs, so the dialog fits a 13" laptop and OK and Cancel are never pushed off screen
Toolbox: Streamlined the toolbox UI and its window entry
Quick settings panel: Adding a connection no longer folds the panel away — keeping it open is your call
Modbus request builder: Removed the empty space at the bottom of the window; it opens at the height the content actually needs
Fixes & Enhancements
Mac App Store launch crash: The 6.6 build installed from the Mac App Store quit immediately on launch. Fixed, and the release pipeline now has a check that stops the same kind of defect from shipping again
No way back from TCP/UDP mode: After a connection switched to TCP or UDP, the settings dialog no longer showed the port and mode pickers, leaving no route back to serial mode
Monospace font on macOS: The default font does not exist on macOS, so it was replaced with a proportional face and the hex and timestamp columns stopped lining up. The font is now picked from what is actually installed
GB18030 four-byte characters: Fixed the decoding of emoji and similar characters, along with a crash on malformed bytes seen with some Qt builds
Unencodable characters are no longer swapped silently: A character the current encoding cannot represent is no longer sent as ? — the frame is held back and the status bar names the character
Smaller install: Dropped an unused database component, cutting roughly 4 MB from the package