William R. Wing (Bill Wing) wrote:
Hello World -
I'm new to both Python and this list, but here's hoping someone can spot
my problem.
System: Mac OS-X, 10.6.3 (Intel dual quad processor)
Using Python 2.6.1, and pyserial-2.5_rc2-py2.6
The following snippet of code is designed to open a port via a KeySpan
USB-to-serial converter and communicate with an X10 power line signaling
system. Before you look at the code, let me mention that my frustration
is the it executes perfectly if i enter it line by line at the Python
prompt, and executes perfectly if I run it under the Wing IDE. It fails
silently (no errors) if I run it as a standalone script. Clearly, I'm
missing something.
What do you mean "It fails silently"? It might be unable to find the
modules if you double-click on the script. You could check for that by
printing a message if the import statement raises an ImportError.
TIA,
Bill Wing
import serial, string
port = '/dev/tty.KeySerial1'
ser = serial.Serial(port, 9600, timeout=1) # Set up handle to serial port
stat1 = ser.write('\x02') # Write "Attention" to
PowerLink
print(' Stat1 is:', stat1)
ack = ser.read(2) # Check to see if PowerLink
is ready
if ack == '\x06\r': # It returns ACK (\x06) \r
if it is
stat2 = ser.write('\x63\x4E\x5C\x45\x41')# send "On" to module at
House Code B, device code 2
print(' Stat2 is:', stat2)
stat3 = ser.close() # Close serial port
print(' Stat3 is:', stat3)
elif ack =='\x15': # PowerLink sends NAC (hex
15) if it isn't.
print('Received NAK after first open')
else: print("Something's wrong at 1.\n")
dummy = raw_input(' Hit any key to continue: ')
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