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-rw-r--r--glucometerutils/drivers/otultraeasy.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/glucometerutils/drivers/otultraeasy.py b/glucometerutils/drivers/otultraeasy.py
index 50a6020..ce68625 100644
--- a/glucometerutils/drivers/otultraeasy.py
+++ b/glucometerutils/drivers/otultraeasy.py
@@ -177,6 +177,11 @@ class _Packet(object):
class Device(object):
def __init__(self, device):
+ if not device:
+ raise exceptions.CommandLineError(
+ '--device parameter is required, should point to the serial device '
+ 'connected to the meter.')
+
self.serial_ = serial.Serial(
port=device, baudrate=9600, bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,