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-rw-r--r--serial/urlhandler/protocol_spy.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/serial/urlhandler/protocol_spy.py b/serial/urlhandler/protocol_spy.py
index 92aaa2e..67c700b 100644
--- a/serial/urlhandler/protocol_spy.py
+++ b/serial/urlhandler/protocol_spy.py
@@ -26,6 +26,7 @@ import sys
import time
import serial
+from serial.serialutil import to_bytes
try:
import urlparse
@@ -200,6 +201,7 @@ class Serial(serial.Serial):
return ''.join([parts.netloc, parts.path])
def write(self, tx):
+ tx = to_bytes(tx)
self.formatter.tx(tx)
return super(Serial, self).write(tx)