diff --git a/pus_tc/cmd_definitions.py b/pus_tc/cmd_definitions.py
index 31a26cf..e18ba84 100644
--- a/pus_tc/cmd_definitions.py
+++ b/pus_tc/cmd_definitions.py
@@ -128,30 +128,6 @@ def add_str_cmds(defs: TmtcDefinitionWrapper):
     defs.add_service(CustomServiceList.STAR_TRACKER.value, "Star Tracker", oce)
 
 
-@tmtc_definitions_provider
-def add_syrlinks_cmds(defs: TmtcDefinitionWrapper):
-    oce = OpCodeEntry()
-    oce.add("0", "Syrlinks Handler: Set mode off")
-    oce.add("1", "Syrlinks Handler: Set mode on")
-    oce.add("2", "Syrlinks Handler: Set mode normal")
-    oce.add("3", "Syrlinks Handler: Set TX standby")
-    oce.add("4", "Syrlinks Handler: Set TX modulation")
-    oce.add("5", "Syrlinks Handler: Set TX carrier wave")
-    oce.add("6", "Syrlinks Handler: Read TX status")
-    oce.add("7", "Syrlinks Handler: Read TX waveform")
-    oce.add("8", "Syrlinks Handler: Read TX AGC value high byte")
-    oce.add("9", "Syrlinks Handler: Read TX AGC value low byte")
-    oce.add("12", "Syrlinks Handler: Write LCL config")
-    oce.add("13", "Syrlinks Handler: Read RX status registers")
-    oce.add("14", "Syrlinks Handler: Read LCL config register")
-    oce.add("15", "Syrlinks Handler: Set waveform OQPSK")
-    oce.add("16", "Syrlinks Handler: Set waveform BPSK")
-    oce.add("17", "Syrlinks Handler: Set second config")
-    oce.add("18", "Syrlinks Handler: Enable debug output")
-    oce.add("19", "Syrlinks Handler: Disable debug output")
-    defs.add_service(CustomServiceList.SYRLINKS.value, "Syrlinks Handler", oce)
-
-
 @tmtc_definitions_provider
 def add_bpx_cmd_definitions(defs: TmtcDefinitionWrapper):
     oce = OpCodeEntry()
diff --git a/pus_tc/devs/syrlinks_hk_handler.py b/pus_tc/devs/syrlinks_hk_handler.py
index 4be6674..fece659 100644
--- a/pus_tc/devs/syrlinks_hk_handler.py
+++ b/pus_tc/devs/syrlinks_hk_handler.py
@@ -5,6 +5,12 @@
 @author J. Meier
 @date   13.12.2020
 """
+from config.definitions import CustomServiceList
+from tmtccmd.config.tmtc import (
+    tmtc_definitions_provider,
+    TmtcDefinitionWrapper,
+    OpCodeEntry,
+)
 from tmtccmd.tc import DefaultPusQueueHelper
 from tmtccmd.tc.pus_3_fsfw_hk import make_sid, generate_one_hk_command
 from spacepackets.ecss.tc import PusTelecommand
@@ -20,7 +26,11 @@ class SetIds:
 
 
 class OpCodes:
-    NORMAL = ["2", "nml"]
+    OFF = "off"
+    ON = "on"
+    NORMAL = "nml"
+    STANDBY = "standby"
+    MODULATION = "modulation"
 
 
 class CommandIds:
@@ -41,28 +51,52 @@ class CommandIds:
     DISABLE_DEBUG = 21
 
 
+@tmtc_definitions_provider
+def add_syrlinks_cmds(defs: TmtcDefinitionWrapper):
+    oce = OpCodeEntry()
+    oce.add(OpCodes.OFF, "Syrlinks Handler: Set mode off")
+    oce.add(OpCodes.ON, "Syrlinks Handler: Set mode on")
+    oce.add(OpCodes.NORMAL, "Syrlinks Handler: Set mode normal")
+    oce.add(OpCodes.STANDBY, "Syrlinks Handler: Set TX standby")
+    oce.add(OpCodes.MODULATION, "Syrlinks Handler: Set TX modulation")
+    oce.add("5", "Syrlinks Handler: Set TX carrier wave")
+    oce.add("6", "Syrlinks Handler: Read TX status")
+    oce.add("7", "Syrlinks Handler: Read TX waveform")
+    oce.add("8", "Syrlinks Handler: Read TX AGC value high byte")
+    oce.add("9", "Syrlinks Handler: Read TX AGC value low byte")
+    oce.add("12", "Syrlinks Handler: Write LCL config")
+    oce.add("13", "Syrlinks Handler: Read RX status registers")
+    oce.add("14", "Syrlinks Handler: Read LCL config register")
+    oce.add("15", "Syrlinks Handler: Set waveform OQPSK")
+    oce.add("16", "Syrlinks Handler: Set waveform BPSK")
+    oce.add("17", "Syrlinks Handler: Set second config")
+    oce.add("18", "Syrlinks Handler: Enable debug output")
+    oce.add("19", "Syrlinks Handler: Disable debug output")
+    defs.add_service(CustomServiceList.SYRLINKS.value, "Syrlinks Handler", oce)
+
+
 def pack_syrlinks_command(
     object_id: ObjectIdU32, q: DefaultPusQueueHelper, op_code: str
 ):
     obyt = object_id.as_bytes
     q.add_log_cmd(f"Testing Syrlinks with object id: {object_id.as_hex_string}")
-    if op_code == "0":
+    if op_code == OpCodes.OFF:
         q.add_log_cmd("Syrlinks: Set mode off")
         data = pack_mode_data(obyt, Modes.OFF, 0)
         q.add_pus_tc(PusTelecommand(service=200, subservice=1, app_data=data))
-    if op_code == "1":
+    if op_code == OpCodes.ON:
         q.add_log_cmd("Syrlinks: Set mode on")
         data = pack_mode_data(obyt, Modes.ON, 0)
         q.add_pus_tc(PusTelecommand(service=200, subservice=1, app_data=data))
-    if op_code == "2":
+    if op_code == OpCodes.NORMAL:
         q.add_log_cmd("Syrlinks: Mode Normal")
         data = pack_mode_data(obyt, Modes.NORMAL, 0)
         q.add_pus_tc(PusTelecommand(service=200, subservice=1, app_data=data))
-    if op_code == "3":
+    if op_code == OpCodes.STANDBY:
         q.add_log_cmd("syrlinks: Set TX mode standby")
         data = obyt + struct.pack("!I", CommandIds.SET_TX_MODE_STANDBY)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=data))
-    if op_code == "4":
+    if op_code == OpCodes.MODULATION:
         q.add_log_cmd("syrlinks: Set TX mode modulation")
         data = obyt + struct.pack("!I", CommandIds.SET_TX_MODE_MODULATION)
         q.add_pus_tc(PusTelecommand(service=8, subservice=128, app_data=data))