--- /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')
+
+
+
+
+