added Function reporting for the BK_5491 multimeter

1 files changed, 45 insertions, 1 deletions

diff --git a/qolab/hardware/multimeter/bk_5491.py b/qolab/hardware/multimeter/bk_5491.py
index 6069efb..e9773cc 100644
--- a/qolab/hardware/multimeter/bk_5491.py
+++ b/qolab/hardware/multimeter/bk_5491.py
@@ -33,7 +33,7 @@ class BK_5491(Multimeter):
         self.query_binary_values = self.resource.query_binary_values
 
         self.switchTime = 0.5 # switch time in seconds for Function/Measurement change 
-        self.deviceProperties.update({})
+        self.deviceProperties.update({'Function'})
 
     def isPrompt(self, string):
         if string[1] == '>':
@@ -147,6 +147,50 @@ class BK_5491(Multimeter):
     def toLocal(self):
         self.sendCmd('K13', expect_reply=False)
 
+    def getFunction(self):
+        reply = self.query('R0')
+        """
+        According to the manual:
+        The reply is in 10 digits in the form <h1><h2><g1><g2><v><x><f1><r1><f2><r2>
+        the <f1> and <f2> correspond to measurement/function of the 1st and 2nd display.
+        Looks like it some sort of a lie, since in our BK_5491A with firmware v1.23,3
+        we get back either 11 digits (if both displays are on) or 9 if only 1st display
+        is on.
+        We are concerned with 1st (primary) display
+        """
+        if len(reply) == 9:
+            f1 = reply[7]
+        elif len(reply) == 11:
+            f1 = reply[7]
+        else:
+            return "Unknown"
+        print(f1)
+        if f1 == "0":
+            return "Vdc"
+        elif f1 == "1":
+            return "Vac"
+        elif f1 == "2":
+            return "Resistance"
+        elif f1 == "3":
+            return "Resistance4Wires"
+        elif f1 == "4":
+            return "Adc"
+        elif f1 == "5":
+            return "Aac"
+        elif f1 == "6":
+            return "Diode"
+        elif f1 == "7":
+            return "Frequency"
+        elif f1 == "8":
+            return "V(ac+dc)"
+        elif f1 == "9":
+            return "A(ac+dc)"
+        elif f1 == "A":
+            return "Continuity"
+        else:
+            return "Unknown"
+
+
 
 if __name__ == '__main__': 
     import pyvisa