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read_tsmppt.py

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+#!/usr/bin/env python
+
+# Based on Morningstar documentation here
+# http://www.morningstarcorp.com/wp-content/uploads/2014/02/TSMPPT.APP_.Modbus.EN_.10.2.pdf
+# and heavily modified version of the script here
+# http://www.fieldlines.com/index.php?topic=147639.0
+
+import time
+counter = 0
+
+import sys
+import json
+
+if len(sys.argv) <= 1:
+    print "Usage: read_tsmppt.py <ip address> <host alias>"
+    exit(1)
+
+host = sys.argv[1]
+alias = sys.argv[2]
+
+# import the server implementation
+from pymodbus.client.sync import ModbusTcpClient as ModbusClient
+
+# configure the client logging
+import logging
+logging.basicConfig()
+log = logging.getLogger('./modbus.error')
+log.setLevel(logging.ERROR)
+
+client = ModbusClient(host,502)
+client.connect()
+
+# Define the State list
+# state = ['Start', 'Night Check', 'Disconnected', 'Night', 'Fault!', 'MPPT', 'Absorption', 'FloatCharge', 'Equalizing', 'Slave']
+
+# read registers. Start at 0 for convenience
+rr = client.read_holding_registers(0,80,unit=1)
+
+# for all indexes, subtract 1 from what's in the manual
+V_PU_hi = rr.registers[0]
+V_PU_lo = rr.registers[1]
+I_PU_hi = rr.registers[2]
+I_PU_lo = rr.registers[3]
+
+V_PU = float(V_PU_hi) + float(V_PU_lo)
+I_PU = float(I_PU_hi) + float(I_PU_lo)
+
+v_scale = V_PU * 2**(-15)
+i_scale = I_PU * 2**(-15)
+p_scale = V_PU * I_PU * 2**(-17)
+
+# battery sense voltage, filtered
+battsV = rr.registers[24] * v_scale
+battsSensedV = rr.registers[26] * v_scale
+battsI = rr.registers[28] * i_scale
+arrayV = rr.registers[27] * v_scale
+arrayI = rr.registers[29] * i_scale
+statenum = rr.registers[50]
+hsTemp = rr.registers[35] 
+rtsTemp = rr.registers[36]
+outPower = rr.registers[58] * p_scale
+inPower = rr.registers[59] * p_scale
+minVb_daily = rr.registers[64] * v_scale
+maxVb_daily = rr.registers[65] * v_scale
+minTb_daily = rr.registers[71]
+maxTb_daily = rr.registers[72]
+dipswitches = bin(rr.registers[48])[::-1][:-2].zfill(8)
+led_state = rr.registers
+data = {
+   alias : {
+	"battvolt" : battsV,
+	"battsense" : battsSensedV,
+	"battamps" : battsI,
+	"battwatts" : (battsV*battsI),
+	"arrayvolt" : arrayV,
+	"arrayamps" : arrayI,
+	"arraywatts" : (arrayV*arrayI),
+	"heatsinktemp" : hsTemp,
+	"batttemp" : rtsTemp,
+	"state" : statenum,
+	"powerout" : outPower,
+	"powerin" : inPower,
+	"battvoltmin" : minVb_daily,
+	"battvoltmax" : maxVb_daily,
+	"batttempmin" : minTb_daily,
+	"batttempmax" : maxTb_daily,
+	}
+   }
+json_str = json.dumps(data)
+print json_str
+client.close()