diff --git a/artiq/devices/pdq2.py b/artiq/devices/pdq2com.py
old mode 100755
new mode 100644
similarity index 64%
rename from artiq/devices/pdq2.py
rename to artiq/devices/pdq2com.py
index 98c9d8da6..9d2ff2d3d
--- a/artiq/devices/pdq2.py
+++ b/artiq/devices/pdq2com.py
@@ -1,16 +1,15 @@
-#!/usr/bin/python
-# -*- coding: utf8 -*-
-#
 # Robert Jordens <jordens@gmail.com>, 2012
 
-import logging, struct
-import numpy as np
-from scipy import interpolate
+import logging
+import struct
 import warnings
 
-logger = logging.getLogger("Pdq2")
+from scipy import interpolate
+import numpy as np
 
 
+logger = logging.getLogger("Pdq2")
+
 Ftdi = None
 
 
@@ -302,129 +301,3 @@ class Pdq2:
         board, dac = divmod(channel, self.num_dacs)
         data = self.add_mem_header(board, dac, data)
         return data
-
-
-def _main():
-    import argparse
-    import time
-
-    parser = argparse.ArgumentParser(description="""PDQ2 frontend.
-            Evaluates times and voltages, interpolates and uploads
-            them.""")
-    parser.add_argument("-s", "--serial", default=None,
-            help="device (FT245R) serial string [first]")
-    parser.add_argument("-c", "--channel", default=0, type=int,
-            help="channel: 3*board_num+dac_num [%(default)s]")
-    parser.add_argument("-f", "--frame", default=0, type=int,
-            help="frame [%(default)s]")
-    parser.add_argument("-e", "--free", default=False,
-            action="store_true",
-            help="software trigger [%(default)s]")
-    parser.add_argument("-n", "--disarm", default=False,
-            action="store_true",
-            help="disarm group [%(default)s]")
-    parser.add_argument("-t", "--times",
-            default="np.arange(5)*1e-6",
-            help="sample times (s) [%(default)s]")
-    parser.add_argument("-v", "--voltages",
-            default="(1-np.cos(t/t[-1]*2*np.pi))/2",
-            help="sample voltages (V) [%(default)s]")
-    parser.add_argument("-o", "--order", default=3, type=int,
-            help="interpolation (0: const, 1: lin, 2: quad, 3: cubic)"
-                 " [%(default)s]")
-    parser.add_argument("-m", "--dcm", default=None, type=int,
-            help="choose fast 100MHz clock [%(default)s]")
-    parser.add_argument("-x", "--demo", default=False, action="store_true",
-            help="demo mode: pulse and chirp, 1V*ch+0.1V*frame [%(default)s]")
-    parser.add_argument("-p", "--plot", help="plot to file [%(default)s]")
-    parser.add_argument("-d", "--debug", default=False,
-            action="store_true", help="debug communications")
-    parser.add_argument("-r", "--reset", default=False,
-            action="store_true", help="do reset before")
-    parser.add_argument("-b", "--bit", default=False,
-            action="store_true", help="do bit test")
-
-    args = parser.parse_args()
-
-    if args.debug:
-        logging.basicConfig(level=logging.DEBUG)
-    else:
-        logging.basicConfig(level=logging.WARNING)
-
-    times = eval(args.times, globals(), {})
-    voltages = eval(args.voltages, globals(), dict(t=times))
-
-    dev = Pdq2(serial=args.serial)
-
-    if args.reset:
-        dev.write(b"\x00") # flush any escape
-        dev.write_cmd("RESET_EN")
-        time.sleep(.1)
-    if args.dcm:
-        dev.write_cmd("DCM_EN")
-        dev.freq = 100e6
-    elif args.dcm == 0:
-        dev.write_cmd("DCM_DIS")
-        dev.freq = 50e6
-    dev.write_cmd("START_DIS")
-
-    if args.demo:
-        channels = [args.channel] if args.channel < dev.num_channels \
-            else range(dev.num_channels)
-        frames = [args.frame] if args.frame < dev.num_frames \
-            else range(dev.num_frames)
-        for channel in channels:
-            f = []
-            for frame in frames:
-                vi = .1*frame + channel + voltages
-                pi = 2*np.pi*(.01*frame + .1*channel + 0*voltages)
-                fi = 10e6*times/times[-1]
-                f.append(b"".join([
-                    dev.frame(times, vi, order=args.order, end=False),
-                    dev.frame(2*times, voltages, pi, fi, trigger=False),
-                    #dev.frame(2*times, 0*vi+.1, 0*pi, 0*fi+1e6),
-                    #dev.frame(times, 0*vi, order=args.order, silence=True),
-                ]))
-            board, dac = divmod(channel, dev.num_dacs)
-            dev.write_data(dev.add_mem_header(board, dac, dev.map_frames(f)))
-    elif args.bit:
-        map = [0] * dev.num_frames
-        t = np.arange(2*16) * 1.
-        v = [-1, 0, -1]
-        for i in range(15):
-            vi = 1<<i
-            v.extend([vi - 1, vi])
-        v = np.array(v)*dev.max_out/(1<<15)
-        t, v = t[:3], v[:3]
-        #print(t, v)
-        for channel in range(dev.num_channels):
-            dev.write_data(dev.multi_frame([(t, v)], channel=channel,
-                order=0, map=map, shift=15, stop=False, trigger=False))
-    else:
-        tv = [(times, voltages)]
-        map = [None] * dev.num_frames
-        map[args.frame] = 0
-        dev.write_data(dev.multi_frame(tv, channel=args.channel,
-                                       order=args.order, map=map))
-
-    dev.write_cmd("START_EN")
-    if not args.disarm:
-        dev.write_cmd("ARM_EN")
-    if args.free:
-        dev.write_cmd("TRIGGER_EN")
-    dev.close()
-
-    if args.plot:
-        from matplotlib import pyplot as plt
-        fig, ax0 = plt.subplots()
-        ax0.plot(times, voltages, "xk", label="points")
-        if args.order:
-            spline = interpolate.splrep(times, voltages, k=args.order)
-            ttimes = np.arange(0, times[-1], 1/dev.freq)
-            vvoltages = interpolate.splev(ttimes, spline)
-            ax0.plot(ttimes, vvoltages, ",b", label="interpolation")
-        fig.savefig(args.plot)
-
-
-if __name__ == "__main__":
-    _main()
diff --git a/frontend/pdq2 b/frontend/pdq2
new file mode 100755
index 000000000..7fd6f3474
--- /dev/null
+++ b/frontend/pdq2
@@ -0,0 +1,134 @@
+#!/usr/bin/env python3
+
+# Robert Jordens <jordens@gmail.com>, 2012
+
+import argparse
+import time
+import logging
+
+from scipy import interpolate
+import numpy as np
+
+from artiq.devices.pdq2com import Pdq2
+
+
+def _main():
+    parser = argparse.ArgumentParser(description="""PDQ2 frontend.
+            Evaluates times and voltages, interpolates and uploads
+            them.""")
+    parser.add_argument("-s", "--serial", default=None,
+            help="device (FT245R) serial string [first]")
+    parser.add_argument("-c", "--channel", default=0, type=int,
+            help="channel: 3*board_num+dac_num [%(default)s]")
+    parser.add_argument("-f", "--frame", default=0, type=int,
+            help="frame [%(default)s]")
+    parser.add_argument("-e", "--free", default=False,
+            action="store_true",
+            help="software trigger [%(default)s]")
+    parser.add_argument("-n", "--disarm", default=False,
+            action="store_true",
+            help="disarm group [%(default)s]")
+    parser.add_argument("-t", "--times",
+            default="np.arange(5)*1e-6",
+            help="sample times (s) [%(default)s]")
+    parser.add_argument("-v", "--voltages",
+            default="(1-np.cos(t/t[-1]*2*np.pi))/2",
+            help="sample voltages (V) [%(default)s]")
+    parser.add_argument("-o", "--order", default=3, type=int,
+            help="interpolation (0: const, 1: lin, 2: quad, 3: cubic)"
+                 " [%(default)s]")
+    parser.add_argument("-m", "--dcm", default=None, type=int,
+            help="choose fast 100MHz clock [%(default)s]")
+    parser.add_argument("-x", "--demo", default=False, action="store_true",
+            help="demo mode: pulse and chirp, 1V*ch+0.1V*frame [%(default)s]")
+    parser.add_argument("-p", "--plot", help="plot to file [%(default)s]")
+    parser.add_argument("-d", "--debug", default=False,
+            action="store_true", help="debug communications")
+    parser.add_argument("-r", "--reset", default=False,
+            action="store_true", help="do reset before")
+    parser.add_argument("-b", "--bit", default=False,
+            action="store_true", help="do bit test")
+
+    args = parser.parse_args()
+
+    if args.debug:
+        logging.basicConfig(level=logging.DEBUG)
+    else:
+        logging.basicConfig(level=logging.WARNING)
+
+    times = eval(args.times, globals(), {})
+    voltages = eval(args.voltages, globals(), dict(t=times))
+
+    dev = Pdq2(serial=args.serial)
+
+    if args.reset:
+        dev.write(b"\x00")  # flush any escape
+        dev.write_cmd("RESET_EN")
+        time.sleep(.1)
+    if args.dcm:
+        dev.write_cmd("DCM_EN")
+        dev.freq = 100e6
+    elif args.dcm == 0:
+        dev.write_cmd("DCM_DIS")
+        dev.freq = 50e6
+    dev.write_cmd("START_DIS")
+
+    if args.demo:
+        channels = [args.channel] if args.channel < dev.num_channels \
+            else range(dev.num_channels)
+        frames = [args.frame] if args.frame < dev.num_frames \
+            else range(dev.num_frames)
+        for channel in channels:
+            f = []
+            for frame in frames:
+                vi = .1*frame + channel + voltages
+                pi = 2*np.pi*(.01*frame + .1*channel + 0*voltages)
+                fi = 10e6*times/times[-1]
+                f.append(b"".join([
+                    dev.frame(times, vi, order=args.order, end=False),
+                    dev.frame(2*times, voltages, pi, fi, trigger=False),
+                    #dev.frame(2*times, 0*vi+.1, 0*pi, 0*fi+1e6),
+                    #dev.frame(times, 0*vi, order=args.order, silence=True),
+                ]))
+            board, dac = divmod(channel, dev.num_dacs)
+            dev.write_data(dev.add_mem_header(board, dac, dev.map_frames(f)))
+    elif args.bit:
+        map = [0] * dev.num_frames
+        t = np.arange(2*16) * 1.
+        v = [-1, 0, -1]
+        for i in range(15):
+            vi = 1<<i
+            v.extend([vi - 1, vi])
+        v = np.array(v)*dev.max_out/(1<<15)
+        t, v = t[:3], v[:3]
+        #print(t, v)
+        for channel in range(dev.num_channels):
+            dev.write_data(dev.multi_frame([(t, v)], channel=channel,
+                order=0, map=map, shift=15, stop=False, trigger=False))
+    else:
+        tv = [(times, voltages)]
+        map = [None] * dev.num_frames
+        map[args.frame] = 0
+        dev.write_data(dev.multi_frame(tv, channel=args.channel,
+                                       order=args.order, map=map))
+
+    dev.write_cmd("START_EN")
+    if not args.disarm:
+        dev.write_cmd("ARM_EN")
+    if args.free:
+        dev.write_cmd("TRIGGER_EN")
+    dev.close()
+
+    if args.plot:
+        from matplotlib import pyplot as plt
+        fig, ax0 = plt.subplots()
+        ax0.plot(times, voltages, "xk", label="points")
+        if args.order:
+            spline = interpolate.splrep(times, voltages, k=args.order)
+            ttimes = np.arange(0, times[-1], 1/dev.freq)
+            vvoltages = interpolate.splev(ttimes, spline)
+            ax0.plot(ttimes, vvoltages, ",b", label="interpolation")
+        fig.savefig(args.plot)
+
+if __name__ == "__main__":
+    _main()