Use better example of PV string concat.

Device.ipynb

@@ -70,10 +70,10 @@
     "from ophyd import Device, Component\n",
     "\n",
     "class RandomWalk(Device):\n",
-    "    x = Component(EpicsSignalRO, ':x')\n",
-    "    dt = Component(EpicsSignal, ':dt')\n",
+    "    x = Component(EpicsSignalRO, 'x')\n",
+    "    dt = Component(EpicsSignal, 'dt')\n",
     "    \n",
-    "random_walk = RandomWalk('random_walk', name='random_walk')\n",
+    "random_walk = RandomWalk('random_walk:', name='random_walk')\n",
     "random_walk"
    ]
   },
@@ -133,7 +133,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "another_random_walk = RandomWalk('another_random_walk', name='another_random_walk')"
+    "another_random_walk = RandomWalk('random_walk:vert-', name='another_random_walk')"
    ]
   },
   {
@@ -159,13 +159,22 @@
    "outputs": [],
    "source": [
     "class RandomWalks(Device):\n",
-    "    a = Component(RandomWalk, 'random_walk')\n",
-    "    b = Component(RandomWalk, 'another_random_walk')\n",
+    "    vert = Component(RandomWalk, 'vert-')\n",
+    "    horiz = Component(RandomWalk, 'horiz-')\n",
     "    \n",
-    "random_walks = RandomWalks('', name='random_walks')\n",
+    "random_walks = RandomWalks('random_walk:', name='random_walks')\n",
     "random_walks"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "random_walks.vert.x.pvname"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -181,7 +190,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "random_walks.a.read()"
+    "random_walks.vert.read()"
    ]
   },
   {
@@ -190,7 +199,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "random_walks.a.x.read()"
+    "random_walks.vert.x.read()"
    ]
   },
   {
@@ -199,7 +208,7 @@
    "source": [
     "## Exercise\n",
     "\n",
-    "Using the `random_walks` Device, set the PV `another_random_walk:dt` to `3`."
+    "Using the `random_walks` Device, set the PV `random_walk:horiz-dt` to `3`."
    ]
   },
   {
@@ -226,7 +235,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "status = random_walks.a.dt.set(2)"
+    "status = random_walks.vert.dt.set(2)"
    ]
   },
   {

solutions/set_subcomponent_signal.py

@@ -1 +1 @@
-random_walks.b.dt.set(3)
+random_walks.horiz.dt.set(3)

supervisor/conf.d/random_walk_horiz.conf

@@ -0,0 +1,5 @@
+[program:random_walk_horiz]
+command = /usr/bin/env python3 -m caproto.ioc_examples.random_walk -v --interfaces=0.0.0.0 --prefix="random_walk:horiz-"
+stdout_logfile = /tmp/random_walk_horiz_stdout.log
+stderr_logfile = /tmp/random_walk_horiz_stderr.log
+stopasgroup = true

supervisor/conf.d/random_walk_vert.conf

@@ -0,0 +1,5 @@
+[program:random_walk_vert]
+command = /usr/bin/env python3 -m caproto.ioc_examples.random_walk -v --interfaces=0.0.0.0 --prefix="random_walk:vert-"
+stdout_logfile = /tmp/random_walk_vert_stdout.log
+stderr_logfile = /tmp/random_walk_vert_stderr.log
+stopasgroup = true