diff --git a/tests/measure_multiple_devices.py b/tests/measure_multiple_devices.py
index b65791c..94ee985 100755
--- a/tests/measure_multiple_devices.py
+++ b/tests/measure_multiple_devices.py
@@ -4,14 +4,18 @@ from sys import exit
 import minimalmodbus
 import serial
 
-slave_address_list = [ 252, 253 ]
+#slave_address_list = [ 252, 253 ]
+slave_address_list = [ 254 ]
 
 # read
+readout_count = 0
+readout_error_count = 0
 while True:
     for slave_address in slave_address_list:
+        readout_count += 1
         # initialize modbus
         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
@@ -37,7 +41,8 @@ while True:
             with open(f'measurement_device_{slave_address}.csv', 'a+') as f:
                 f.write(f'{time():.1f} {CO2} {T_SHT4x} {RH_SHT4x} {T_SCD4x} {RH_SCD4x} {T_SHT4x_signed} {T_SCD4x_signed}\n')
         except minimalmodbus.NoResponseError as e:
+            readout_error_count += 1
             with open('measure.log', 'a+') as logfile:
-                logfile.write(f'Read error for device {slave_address} at {time()} ({str(e)})\n')
+                logfile.write(f'Read error for device {slave_address} at {time()} ({str(e)}) ({readout_error_count}/{readout_count} readouts failed)\n')
             continue
     sleep(10)