<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello World -<div>I'm new to both Python and this list, but here's hoping someone can spot my problem.</div><div><br></div><div>System: Mac OS-X, 10.6.3 (Intel dual quad processor)</div><div>Using Python 2.6.1, and pyserial-2.5_rc2-py2.6</div><div><br></div><div>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.</div><div><br></div><div>TIA,</div><div>Bill Wing</div><div><br></div><div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">import serial, string</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"><br></span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">port = '/dev/tty.KeySerial1'</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"><br></span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">ser = serial.Serial(port, 9600, timeout=1) # Set up handle to serial port</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">stat1 = ser.write('\x02') # Write "Attention" to PowerLink</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">print(' Stat1 is:', stat1) </span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">ack = ser.read(2) # Check to see if PowerLink is ready</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">if ack == '\x06\r': # It returns ACK (\x06) \r if it is</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"> stat2 = ser.write('\x63\x4E\x5C\x45\x41')# send "On" to module at House Code B, device code 2</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"> print(' Stat2 is:', stat2)</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"> stat3 = ser.close() # Close serial port</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"> print(' Stat3 is:', stat3)</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">elif ack =='\x15': # PowerLink sends NAC (hex 15) if it isn't.</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"> print('Received NAK after first open')</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">else: print("Something's wrong at 1.\n")</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"><br></span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;">dummy = raw_input(' Hit any key to continue: ')</span></font></div><div><font class="Apple-style-span" face="Monaco" size="3"><span class="Apple-style-span" style="font-size: 11px;"><br></span></font></div></div><div><br></div><div><br></div></body></html>