WIP write multiple registers

tests/write_multiple_holding_registers_test.py

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+#!/usr/bin/env python3
+from time import sleep
+from sys import exit
+import minimalmodbus
+import serial
+
+slave_address = 254
+instrument = minimalmodbus.Instrument('/dev/ttyUSB0', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
+
+instrument.serial.baudrate = 19200
+instrument.serial.bytesize = 8
+instrument.serial.parity   = serial.PARITY_EVEN
+instrument.serial.stopbits = 1
+instrument.serial.timeout  = 0.05          # seconds
+instrument.mode = minimalmodbus.MODE_RTU   # rtu or ascii mode
+instrument.clear_buffers_before_each_transaction = True
+
+# holding register numbers
+LED_on_register = 0
+LED_brightness_register = 1
+LED_smooth_register = 2
+CO2_alert_limit_1_register = 3
+CO2_alert_limit_2_register = 4
+SCD4x_temperature_offset_register = 5
+MODBUS_address_register = 6
+baudrate_register = 7
+# values
+LED_on = 1
+LED_brightness = 100
+LED_smooth = 0
+CO2_alert_limit_1 = 1000
+CO2_alert_limit_2 = 2000
+SCD4x_temperature_offset = 0
+MODBUS_address = 254
+baudrate = 0
+registers = [LED_on, LED_brightness, LED_smooth, CO2_alert_limit_1, CO2_alert_limit_2, SCD4x_temperature_offset, MODBUS_address, baudrate]
+# write to holding registers
+print('---- Writing to multiple holding registers ----')
+instrument.write_registers(LED_on_register, registers)
+print('---- DONE ----')
+exit(0)