Crashing if reading more then 2

[vwidmer]

I am trying to put in the same registers as the python script below:

I add 3 registers, for the first one I put 0, next 1 and next 2

It will fail. If I just put 2 registers 0 and 1 or any other 2 registers, it works?

Any idea what I maybe doing wrong?

`#!/usr/bin/env python3

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 ")
exit(1)

host = sys.argv[1]
modbusport = int(sys.argv[2])
alias = sys.argv[3]

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=modbusport)

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 = {
"SiteID" : alias,
"battvolt" : battsV,
"battsense" : battsSensedV,
"battamps" : battsI,
"battwatts" : (battsVbattsI),
"arrayvolt" : arrayV,
"arrayamps" : arrayI,
"arraywatts" : (arrayVarrayI),
"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()
`