libdevice-serialport-perl

Emulation of win32::serialport for linux/posix
  https://metacpan.org/release/Device-SerialPort/
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Device::serialport provides an object-based user interface essentially identical to the one provided by the win32::serialport module. this provides device-level access to a system's serial port.

also included is modemtest -- a tool for examining your modem using device::serialport.