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/Designs/Measuring_instruments/ISMS01A/SW/modbus_test.py
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#!/usr/bin/env python
import minimalmodbus
import time
 
instrument = minimalmodbus.Instrument('/dev/ttyUSB0', 1) # port name, slave address (in decimal)
 
instrument.serial.port # this is the serial port name
instrument.serial.baudrate = 9600 # Baud
instrument.serial.bytesize = 8
instrument.serial.stopbits = 2
instrument.serial.timeout = 0.5 # seconds
 
instrument.address = 0x1E # this is the slave address number
instrument.mode = minimalmodbus.MODE_RTU # rtu or ascii mode
 
instrument.write_register(0x01, 0x1F, 0) # Registernumber, value, number of decimals for storage
 
time.sleep(0.5)
 
## Read temperature (PV = ProcessValue) ##
temperature = instrument.read_float(0x53, 3, 2) # Registernumber, number of decimals
print temperature
conductivity = instrument.read_float(0x55, 3, 2) # Registernumber, number of decimals
print conductivity
salinity = instrument.read_float(0x57, 3, 2) # Registernumber, number of decimals
print salinity
tds_kcl = instrument.read_float(0x59, 3, 2) # Registernumber, number of decimals
print tds_kcl
 
 
## Change temperature setpoint (SP) ##
 
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