diff -r 9af1509775b6 -r 0670b1f5c155 gpib_plotter.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gpib_plotter.py	Mon Dec 10 21:18:31 2007 +0100
@@ -0,0 +1,123 @@
+import sys, os
+import time
+import gpib
+
+class GPIBplotter(gpib.GPIB):
+    replies={
+        "OE": "0",
+        "OH": "0,0,10000,7500",
+        "OI": "7470A",
+        "OP": "0,0,10000,7500",
+        "OO": "0,1,0,0,0,0,0,0",
+        "OF": "40,40",
+        "OS": "24",
+        }
+    def __init__(self, device="/dev/ttyUSB0", baudrate=115200, timeout=0.1,
+                 address=0):
+        super(GPIBplotter, self).__init__(device, baudrate, timeout, address, mode=0)
+
+    def load_plot(self, wait_timeout=0):
+        """
+        Make a full plot process.
+
+        'wait_timeout' is the first timeout. Same semantic as the
+        'timeout' property of a serial connection (if set to None, it
+        will block until the GPIB device actually perform a plot
+        command.)
+        """
+        res = ""
+        i=0
+        replies = self._replies.copy()
+        if wait_timeout is not None or not isinstance(wait_timeout, int):
+            raise TypeError
+        if wait_timeout<0:
+            raise ValueError
+        
+        self._cnx.timeout = wait_timeout
+        firstloop = True
+        while i<self._retries:
+            l = self._cnx.readline().strip()
+            if firstloop:
+                self._cnx.timeout = self._timeout
+                firstloop = False
+            if l == "":
+                i += 1
+                for k, v in replies.items():
+                    if res.endswith(k) or res.endswith(k+';'):
+                        self._cnx.write("%s"%v)
+                        if k == "OS":
+                            replies[k] = "16"
+                        break
+                self._cnx.write('\r')
+                if i > self._retries/2:
+                    time.sleep(self._timeout)
+                continue
+            res += l + "\n"
+            i = 0
+        return res
+
+if __name__ == '__main__':
+    import optparse
+    opt = optparse.OptionParser('A simple HP7470A GPIB plotter emulator for USB-GPIB bundle (ProLogix)')
+    opt.add_option('-f', '--filename', default=None,
+                   dest='filename',
+                   help='Output filename. If not set, write to stdout')
+    opt.add_option('-d', '--device', default='/dev/ttyUSB0',
+                   dest='device',
+                   help='Device of the RS232 connection (default: /dev/ttyUSB0)',
+                   )
+    opt.add_option('-a', '--address', default=0,
+                   dest='address',
+                   help='GPIB address of the device',
+                   )
+    opt.add_option('-l', '--loop', default=False,
+                   action="store_true",
+                   dest="loop",
+                   help="Continuously wait for new plots. If set, filename must be set and files will be created with _n at the end")
+    opt.add_option('-v', '--verbose', default=False,
+                   action="store_true",
+                   dest="verbose",
+                   help="Verbose mode",)
+    
+    options, argv = opt.parse_args(sys.argv)
+
+    if options.loop and not options.filename:
+        opt.error('If loop is set, you *must* provide a filename')
+
+    if options.filename:        
+        outf = open(options.filename, "w")
+    else:
+        outf = sys.stdout
+
+
+    try:
+        plotter = GPIBplotter(device=options.device, address=options.address)
+    except (gpib.SerialException, gpib.ConnectionError), e:
+        sys.stderr.write('Connection error:\n\t' + '\n\t'.join([str(x) for x in e.args]) + '\n')
+        sys.stderr.write('Check your parameters\n')
+        sys.exit(1)
+    if options.verbose:
+        sys.stderr.write('connection established\n')
+
+    loop = True
+    nloop = 0
+    while loop:
+        plot = plotter.load_plot(wait_timeout=1)
+        if options.verbose:
+            sys.stderr.write('.')
+        if plot:
+            outf.write(plot)
+            if options.verbose:
+                sys.stderr.write('\n')
+            sys.stderr.write('Received a new plot (written to %s)\n'%outf.name) 
+            if not options.loop:
+                loop = False
+            else:
+                nloop += 1
+                fname, ext = os.path.splitext(options.filename)
+                outf = open(fname + "_%d"%nloop + ext, 'w')
+                
+        
+    
+
+