diff --git a/src/spectrumdevice/settings/io_lines.py b/src/spectrumdevice/settings/io_lines.py
index 64d25b2..8a735ca 100644
--- a/src/spectrumdevice/settings/io_lines.py
+++ b/src/spectrumdevice/settings/io_lines.py
@@ -14,7 +14,7 @@
 from spectrumdevice.settings.channel import SpectrumChannelName
 from spectrumdevice.spectrum_wrapper import decode_bitmap_using_list_of_ints
 from spectrum_gmbh.py_header.regs import (
-    SPCM_XMODE_DISABLE,
+    SPCM_X2_MODE, SPCM_X3_MODE, SPCM_XMODE_DISABLE,
     SPCM_XMODE_ASYNCIN,
     SPCM_XMODE_ASYNCOUT,
     SPCM_XMODE_DIGIN,
@@ -94,6 +94,8 @@ class IOLineMode(Enum):
 IO_LINE_MODE_COMMANDS = (
     SPCM_X0_MODE,
     SPCM_X1_MODE,
+    SPCM_X2_MODE,
+    SPCM_X3_MODE,
     SPCM_X4_MODE,
     SPCM_X5_MODE,
     SPCM_X6_MODE,