Made a version of the serial munin module to easily dump extra data that don't graph well. Planning on eventually unifying all of these properly to avoid code duplication, which we have in spades at the moment.

read_registers_serial.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
+
+# This is modified for the non-MPPT tri-stars without built-in network monitoring. It has different indices and different available data.
+
+import sys
+import re
+import time
+counter = 0
+
+script = sys.argv[0]
+host = re.sub(r".*tristar_monitoring_",'',script)
+
+if len(sys.argv) == 2:
+    if sys.argv[1] == "config":
+#        print "host_name %s" % host
+        print "graph_category power"
+       	print "graph_title Solar Charge Controller Info"
+	print "graph_vlabel A bit of all (V, A, C)"
+	print "vPanel.label panel potential (V)"
+	print "vPanel.max   80"
+	print "vBattTerm.label battery potential at terminals (V)"
+        print "vBattTerm.max 32"
+        print "vBattTerm.warning 25:32"
+        print "vBattTerm.critical 24:33"
+#	print "vBattSense.label battery potential sensing (V)"
+#	print "vBattSense.max 32"
+	print "hsTemp.label heat sink temperature (C)"
+	print "hsTemp.max 120"
+        print "hsTemp.warning :60"
+        print "hsTemp.critical :80"
+	# print "battTemp.label battery temperature (C)"
+	# print "battTemp.max 120"
+        # print "battTemp.warning :80"
+        # print "battTemp.critical :100"
+	print "aPanel.label charge current (A)"
+	print "aPanel.max 20"
+#        print "aPanel.warning :15"
+#        print "aPanel.critical :19"
+#	print "aBatt.label battery current (A)"
+#	print "aBatt.max 20"
+#        print "aBatt.warning :15"
+#        print "aBatt.critical :19"
+        exit(0)
+# import the server implementation
+from pymodbus.client.sync import ModbusSerialClient as ModbusClient
+
+# configure the client logging
+import logging
+logging.basicConfig()
+log = logging.getLogger('./modbus.error')
+log.setLevel(logging.ERROR)
+
+client = ModbusClient(method='rtu',port='/dev/ttyUSB0', baudrate=9600, timeout=1)
+client.connect()
+log.debug(client)
+
+# Define the State list
+state = ['Start', 'Night Check', 'Disconnected', 'Night', 'Fault!', 'BulkCharge', 'Absorption', 'FloatCharge', 'Equalizing']
+
+# read registers. Start at 0 for convenience
+rr = client.read_holding_registers(0,37,1)
+if rr == None:
+    client.close()
+    log.error("couldn't connect")
+    exit(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 = 96.667 * 2**(-15)
+i_scale = 66.667 * 2**(-15)
+#p_scale = V_PU * I_PU * 2**(-17)
+array_scale = 139.15 * 2**(-15)
+# battery sense voltage, filtered
+battsV = rr.registers[8] * v_scale
+#battsV = ( rr.registers[8] * 96.667 ) / 32768
+#battsSensedV = rr.registers[26] * v_scale
+battsI = rr.registers[12] * i_scale * 4.75
+arrayV = rr.registers[10] * array_scale
+arrayI = rr.registers[11] * i_scale
+statenum = rr.registers[27]
+hsTemp = rr.registers[14] 
+#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
+print "vBattTerm.value %.2f" % battsV
+#print "vBattSense.value %.2f" % battsSensedV
+#print "aBatt.value %.2f" % battsI
+#print "battery watts:   %.2f" % (battsV*battsI)
+print "vPanel.value %.2f" % arrayV
+print "aPanel.value %.2f" % arrayI
+#print "array watts:     %.2f" % (arrayV*arrayI)
+print "hsTemp.value %.2f" % hsTemp
+#print "battTemp.value %.2f" % rtsTemp
+print "state:           %s" % state[statenum]
+#print "out power:       %0.2f" % outPower
+#print "in Power:        %0.2f" % inPower
+#print "min Vb daily:    %0.2f" % minVb_daily
+#print "max Vb daily:    %0.2f" % maxVb_daily
+#print "min Tb daily:    %0.2f" % minTb_daily
+#print "max Tb daily:    %0.2f" % maxTb_daily
+#print "dipswitches:     %s" % dipswitches
+#print "dipswitches:     12345678"
+#print ""
+client.close()