diff --git a/apspu_lib.py b/apspu_lib.py
index b59bd79de7a9923f6cfbe61e366eef51ec971345..2113ff077b1189d1b6ad3145fa4d3e444a4b9086 100644
--- a/apspu_lib.py
+++ b/apspu_lib.py
@@ -29,7 +29,7 @@ else:
     from I2C_serial import *
 
 
-I2CBUSNR = 3
+I2CBUSNR = 1
 DEBUG = False
 
 class ApspuClass:
@@ -301,7 +301,7 @@ class PolClass:
         #
         if self.status:
             ret_ack, raw_value = self.pol_dev.read_bytes(0x39,2)
-            ret_ack, raw_value = self.pol_dev.read_bytes(LP_IOUT, 2)
+            ret_ack, raw_value = self.pol_dev.read_bytes(LP_IOUT, 3)
             ret_value = []
             ret_value.append(int(raw_value[:2], 16))
             ret_value.append(int(raw_value[2:], 16))