Ryan Malloy 974f2ee6dc Add RS-485 specific tools
New tools for RS-485 half-duplex communication:

- check_rs485_support: Detect hardware RS-485 capability via udev/ioctl
  Reports driver type (FTDI/CP210x/CH340), kernel support, and recommendations

- rs485_transact: Send request and receive response with automatic
  TX/RX turnaround timing. Handles manual RTS control when needed.

- rs485_scan_addresses: Scan bus for responding devices (1-247)
  Useful for Modbus device discovery
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2026-01-27 22:42:40 -07:00