diff --git a/tests/measure.py b/tests/old/measure.py
similarity index 100%
rename from tests/measure.py
rename to tests/old/measure.py
diff --git a/tests/measure_multiple_devices.py b/tests/old/measure_multiple_devices.py
similarity index 100%
rename from tests/measure_multiple_devices.py
rename to tests/old/measure_multiple_devices.py
diff --git a/tests/read_input_register_test.py b/tests/old/read_input_register_test.py
similarity index 96%
rename from tests/read_input_register_test.py
rename to tests/old/read_input_register_test.py
index 439f316..825f743 100755
--- a/tests/read_input_register_test.py
+++ b/tests/old/read_input_register_test.py
@@ -4,10 +4,10 @@ from sys import exit
 import minimalmodbus
 import serial
 
-slave_address = 252
+slave_address = 247
 instrument = minimalmodbus.Instrument('/dev/rs485', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
 
-instrument.serial.baudrate = 115200
+instrument.serial.baudrate = 19200
 instrument.serial.bytesize = 8
 instrument.serial.parity   = serial.PARITY_EVEN
 instrument.serial.stopbits = 1
diff --git a/tests/read_write_holding_registers_test.py b/tests/old/read_write_holding_registers_test.py
similarity index 92%
rename from tests/read_write_holding_registers_test.py
rename to tests/old/read_write_holding_registers_test.py
index 8225a71..dbbd4ce 100755
--- a/tests/read_write_holding_registers_test.py
+++ b/tests/old/read_write_holding_registers_test.py
@@ -1,10 +1,10 @@
 #!/usr/bin/env python3
 from time import sleep
-from sys import exit
+from sys import exit, argv
 import minimalmodbus
 import serial
 
-slave_address = 254
+slave_address = 247
 instrument = minimalmodbus.Instrument('/dev/ttyUSB0', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
 
 instrument.serial.baudrate = 19200
@@ -47,6 +47,8 @@ f'''[{LED_on_register+reg_base}] LED_on = {LED_on}
 [{baudrate_register+reg_base}] baudrate = {baudrate}''')
 # write to holding register
 print('---- Writing to holding registers ----')
-instrument.write_register(LED_on_register, 1, functioncode=6)
+led_brightness = int(argv[1])
+print(f'brightness = {led_brightness}') 
+instrument.write_register(LED_brightness_register, led_brightness, functioncode=6)
 print('---- DONE ----')
 exit(0)
diff --git a/tests/write_multiple_holding_registers_test.py b/tests/old/write_multiple_holding_registers_test.py
similarity index 90%
rename from tests/write_multiple_holding_registers_test.py
rename to tests/old/write_multiple_holding_registers_test.py
index add79fd..ca24d33 100755
--- a/tests/write_multiple_holding_registers_test.py
+++ b/tests/old/write_multiple_holding_registers_test.py
@@ -4,7 +4,7 @@ from sys import exit
 import minimalmodbus
 import serial
 
-slave_address = 254
+slave_address = 247
 instrument = minimalmodbus.Instrument('/dev/ttyUSB0', slave_address, close_port_after_each_call=True)  # port name, slave address (in decimal)
 
 instrument.serial.baudrate = 19200
@@ -26,12 +26,12 @@ 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
+LED_brightness = 10
+LED_smooth = 1
+CO2_alert_limit_1 = 1500
+CO2_alert_limit_2 = 3000
 SCD4x_temperature_offset = 0
-MODBUS_address = 254
+MODBUS_address = 247
 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