ACM1219: add checkHWIdent

waiting 0.5 sec before the first communication helps to start
properly

+ added usb dev names for box

cfg/razorbillUC220T_cfg.py

@@ -8,7 +8,7 @@ Node('UC220T.psi.ch',
 Mod('io1',
     'frappy_psi.RP100.RP100IO',
     'communication',
-    uri='serial:///dev/tty.usbmodem1401?baudrate=9600+bytesize=8+parity=none+stopbits=1')
+    uri='serial:///dev/ttyACM0?baudrate=9600+bytesize=8+parity=none+stopbits=1')
 Mod('V1',
     'frappy_psi.RP100.VoltageChannel',
     'Voltage Channel 1',
@@ -33,7 +33,7 @@ Mod('V2',
 Mod('io2',
     'frappy_psi.ACM1219.ACM1219IO',
     'communication',
-    uri='serial:///dev/tty.usbserial-A904TGR7?baudrate=9600+bytesize=8+parity=none+stopbits=1')
+    uri='serial:///dev/ttyUSB0?baudrate=9600+bytesize=8+parity=none+stopbits=1')
 Mod('C1C2',
     'frappy_psi.ACM1219.BothChannels',
     'Capacitance channels 1 and 2',
@@ -81,4 +81,4 @@ Mod('T',
     'frappy_psi.dummy.Temp',
     'dummy T written from client',
     target=Param(min=1, max=325),
-    )
+    )

frappy_psi/ACM1219.py

@@ -17,6 +17,7 @@
 #   Paul M. Neves <pmneves@mit.edu>
 # *****************************************************************************
 
+import time
 from frappy.core import Readable, Parameter, FloatRange, HasIO, StringIO, Property, IntRange,\
     IDLE, BUSY, WARN, ERROR, Drivable, BoolType, Attached, StructOf
 
@@ -24,7 +25,18 @@ from frappy.core import Readable, Parameter, FloatRange, HasIO, StringIO, Proper
 class ACM1219IO(StringIO):
     """communication with ACM1219"""
     end_of_line = ('\r\n', '\r') # ('\n', '\r') ('\r\n', '\r')
-    identification = [('*IDN?', r'.*')]
+    encoding = 'latin-1'  # initial reply might not be ascii for a strange reason
+    identification = [('*IDN?', r'.*,ACM1219,.*')]
+
+    def checkHWIdent(self):
+        for _ in range(3):
+            time.sleep(0.5)
+            try:
+                self.communicate('*IDN?')
+                break
+            except Exception:
+                pass
+        super().checkHWIdent()
 
 
 class BothChannels(HasIO, Readable):
@@ -188,4 +200,4 @@ class YoungsModulus(Readable):
 
     def read_value(self):
         return self.stress.value / self.strain.value
-    
+