Our preferred route for serial I/O
with Python is Roger Burnham’s
package. This is free and comes with an installer and several
Serial package is based on a set of serial
communications libraries developed by
www.marshallsoft.com) over the last eight
years. These libraries are available as a 16- and 32-bit DLL with
identical interfaces, which makes it easy to migrate applications
from 16- to 32-bit and back again. The libraries
are available as shareware packages for Visual Basic, C, and Delphi.
MarshallSoft have kindly allowed their DLL to be used free of charge
as part of the Python package provided a brief message is included
with any distribution. The core DLL is not Open Source but has been
heavily tested and won several awards.
Serial package uses SWIG (see Chapter 22 ) to create a Python DLL wrapper around the
library, and provides easy-to-use Python wrappers and examples. The
Python wrapper class is Open Source and provides a simple high-level
API that simplifies many common communications tasks. The
Serial package provides functions to open and
close serial ports and to read and write from them.
“Hello, World” of the communications field is to send an
AT command to a modem and get back a response, so
we will take care of this formality first. If you are not familiar
with modems, they almost all speak a common command language defined by Hayes; the computer sends a line of ...