diff --git a/coordinator/coordinator.lua b/coordinator/coordinator.lua
index 2a20e06..aa29ee8 100644
--- a/coordinator/coordinator.lua
+++ b/coordinator/coordinator.lua
@@ -316,7 +316,7 @@ function coordinator.comms(version, nic, num_units, crd_channel, svr_channel, pk
 
     -- attempt connection establishment
     local function _send_establish()
-        _send_sv(PROTOCOL.SCADA_MGMT, MGMT_TYPE.ESTABLISH, { comms.version, version, DEVICE_TYPE.CRDN })
+        _send_sv(PROTOCOL.SCADA_MGMT, MGMT_TYPE.ESTABLISH, { comms.version, version, DEVICE_TYPE.CRD })
     end
 
     -- keep alive ack
diff --git a/scada-common/comms.lua b/scada-common/comms.lua
index f01a3e5..081950e 100644
--- a/scada-common/comms.lua
+++ b/scada-common/comms.lua
@@ -21,7 +21,7 @@ comms.version = "2.3.0"
 
 ---@enum PROTOCOL
 local PROTOCOL = {
-    MODBUS_TCP = 0,      -- our "MODBUS TCP"-esque protocol
+    MODBUS_TCP = 0,      -- the "MODBUS TCP"-esque protocol
     RPLC = 1,            -- reactor PLC protocol
     SCADA_MGMT = 2,      -- SCADA supervisor management, device advertisements, etc
     SCADA_CRDN = 3       -- data/control packets for coordinators to/from supervisory controllers
@@ -74,14 +74,8 @@ local ESTABLISH_ACK = {
     BAD_VERSION = 3      -- link denied due to comms version mismatch
 }
 
----@enum DEVICE_TYPE
-local DEVICE_TYPE = {
-    PLC = 0,             -- PLC device type for establish
-    RTU = 1,             -- RTU device type for establish
-    SV = 2,              -- supervisor device type for establish
-    CRDN = 3,            -- coordinator device type for establish
-    PKT = 4              -- pocket device type for establish
-}
+---@enum DEVICE_TYPE device types for establish messages
+local DEVICE_TYPE = { PLC = 0, RTU = 1, SVR = 2, CRD = 3, PKT = 4 }
 
 ---@enum PLC_AUTO_ACK
 local PLC_AUTO_ACK = {
diff --git a/supervisor/supervisor.lua b/supervisor/supervisor.lua
index 3c25110..498a51d 100644
--- a/supervisor/supervisor.lua
+++ b/supervisor/supervisor.lua
@@ -291,7 +291,7 @@ function supervisor.comms(_version, nic, fp_ok)
                                 end
 
                                 _send_establish(packet.scada_frame, ESTABLISH_ACK.BAD_VERSION)
-                            elseif dev_type == DEVICE_TYPE.CRDN then
+                            elseif dev_type == DEVICE_TYPE.CRD then
                                 -- this is an attempt to establish a new coordinator session
                                 local s_id = svsessions.establish_crd_session(src_addr, firmware_v)