Initial Commit.

A small helper library for dps5005 power supplies using minimalmodbus

Author: Ultrawipf

pydps.py

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+import minimalmodbus, serial
+
+# Example Usage:
+# import pydps
+# dps = pydps.dps_psu('COM3', 1) # port name, slave address
+# print(dps.getModel())
+# print(dps.getVoltage())
+
+
+class dps_psu(minimalmodbus.Instrument):
+
+    def __init__(self, portname, slaveaddress):
+            minimalmodbus.Instrument.__init__(self, portname, slaveaddress,mode='rtu')
+            self.serial.baudrate = 9600
+            self.serial.bytesize = 8
+            self.serial.parity   = serial.PARITY_NONE
+            self.serial.stopbits = 1
+            self.serial.timeout  = 0.5
+
+    def getVoltage(self):
+        return self.read_register(0x0002,2)
+
+    def getCurrent(self):
+        return self.read_register(0x0003,3)
+
+    def getPower(self):
+        return self.read_register(0x0004,2)
+
+    def setVoltage(self,volt):
+        self.write_register(0x0000,volt,2)
+
+    def setCurrent(self,curr):
+        self.write_register(0x0001,curr,3)
+
+    def setOutput(self,on):
+        self.write_register(0x0009,(1 if on else 0),0)
+
+    def getInputVoltage(self):
+        return self.read_register(0x0005,2)
+
+    def getFwVersion(self):
+        return self.read_register(0x000C,0)
+
+    def getModel(self):
+        return self.read_register(0x000B,0)
+
+    def setKeyLock(self, lock):
+        self.write_register(0x0006,(1 if lock else 0),0)
+
+    # Read all interesting status registers at once
+    def getFullData(self):
+        buf = self.read_registers(0x00,10)
+        dat = {"u-set" : buf[0]*0.01, "i-set": buf[1]*0.001, "u-out":round(buf[2]*0.01,2), "i-out":round(buf[3]*0.001,3), "power":round(buf[4]*0.01,2), "u-in":buf[5]*0.01, "lock":buf[6], "protect":buf[7], "cvcc":buf[8],"on":buf[9]}
+        return dat

test_dps.py

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+import pydps,time
+
+# dps Test Example
+
+def main():
+    dps = pydps.dps_psu('COM3', 1) # port name, slave address (in decimal)
+    print(dps.getModel())
+    print(dps.getFullData())
+    dps.setVoltage(0)
+    dps.setOutput(True)
+    for v in range(0,1400,50):
+        dps.setVoltage(v*0.01)
+        time.sleep(0.25) #wait for stable voltage
+        dat=dps.getFullData()
+        print(str(dat["i-out"]) + 'A ' + str(dat['u-out']) + 'V')
+    dps.setOutput(False)
+
+
+if __name__ == "__main__":
+    main()