diff --git a/driver/chargerybms.py b/driver/chargerybms.py
index 6453580..cac0a66 100644
--- a/driver/chargerybms.py
+++ b/driver/chargerybms.py
@@ -39,10 +39,12 @@ parser = argparse.ArgumentParser(description = 'Chargery BMS driver')
 parser.add_argument('--version', action='version', version='%(prog)s v' + str(driver['version']) + ' (' + driver['serial'] + ')')
 parser.add_argument('--test', action="store_true", help='test some stored examples network packets')
 parser.add_argument('--victron', action="store_true", help='enable Victron DBUS support for VenusOS')
+requiredArguments = parser.add_argument_group('required arguments')
+requiredArguments.add_argument('-d', '--device', help='serial device for data (eg /dev/ttyUSB0)', required=True)
 args = parser.parse_args()
 
 
-serial_port = serial.Serial('/dev/ttyUSB0', 115200, timeout=1)
+serial_port = serial.Serial(args.device, 115200, timeout=1)
 serial_port.flushInput()
 logging.info(serial_port.name)  
 
diff --git a/driver/start-chargerybms.sh b/driver/start-chargerybms.sh
index acfbf26..79287ad 100644
--- a/driver/start-chargerybms.sh
+++ b/driver/start-chargerybms.sh
@@ -10,7 +10,4 @@
 . /opt/victronenergy/serial-starter/run-service.sh
 
 app="/usr/bin/python /opt/victronenergy/chargerybms/chargerybms.py"
-verbose="--victron -v --log-before 25 --log-after 25"
-timeout=3
-
-start $verbose -t $timeout --banner -s /dev/$tty
+start -d /dev/$tty --victron