diff --git a/supervisor/session/rtu.lua b/supervisor/session/rtu.lua
index 9468255..ca4e467 100644
--- a/supervisor/session/rtu.lua
+++ b/supervisor/session/rtu.lua
@@ -102,8 +102,29 @@ function rtu.new_session(id, in_queue, out_queue, advertisement)
 
             local u_type = unit_advert.type
 
-            -- create unit by type
+            -- validate unit advertisement
+
+            local advert_validator = util.new_validator()
+            advert_validator.assert_type_int(unit_advert.index)
+            advert_validator.assert_type_int(unit_advert.reactor)
+
             if u_type == RTU_UNIT_TYPES.REDSTONE then
+                advert_validator.assert_type_table(unit_advert.rsio)
+            end
+
+            if advert_validator.valid() then
+                advert_validator.assert_min(unit_advert.index, 1)
+                advert_validator.assert_min(unit_advert.reactor, 1)
+                if not advert_validator.valid() then u_type = false end
+            else
+                u_type = false
+            end
+
+            -- create unit by type
+
+            if u_type == false then
+                -- validation fail
+            elseif u_type == RTU_UNIT_TYPES.REDSTONE then
                 -- redstone
                 unit, rs_in_q = svrs_redstone.new(self.id, i, unit_advert, self.out_q)
             elseif u_type == RTU_UNIT_TYPES.BOILER then
diff --git a/supervisor/session/rtu/redstone.lua b/supervisor/session/rtu/redstone.lua
index 6e6f7b5..2447094 100644
--- a/supervisor/session/rtu/redstone.lua
+++ b/supervisor/session/rtu/redstone.lua
@@ -90,25 +90,31 @@ function redstone.new(session_id, unit_id, advert, out_queue)
     -- setup I/O
     for i = 1, #advert.rsio do
         local channel = advert.rsio[i]
-        local mode = rsio.get_io_mode(channel)
 
-        if mode == IO_MODE.DIGITAL_IN then
-            self.has_di = true
-            table.insert(self.io_list.digital_in, channel)
-        elseif mode == IO_MODE.DIGITAL_OUT then
-            table.insert(self.io_list.digital_out, channel)
-        elseif mode == IO_MODE.ANALOG_IN then
-            self.has_ai = true
-            table.insert(self.io_list.analog_in, channel)
-        elseif mode == IO_MODE.ANALOG_OUT then
-            table.insert(self.io_list.analog_out, channel)
+        if rsio.is_valid_channel(channel) then
+            local mode = rsio.get_io_mode(channel)
+
+            if mode == IO_MODE.DIGITAL_IN then
+                self.has_di = true
+                table.insert(self.io_list.digital_in, channel)
+            elseif mode == IO_MODE.DIGITAL_OUT then
+                table.insert(self.io_list.digital_out, channel)
+            elseif mode == IO_MODE.ANALOG_IN then
+                self.has_ai = true
+                table.insert(self.io_list.analog_in, channel)
+            elseif mode == IO_MODE.ANALOG_OUT then
+                table.insert(self.io_list.analog_out, channel)
+            else
+                -- should be unreachable code, we already validated channels
+                log.error(util.c(log_tag, "failed to identify advertisement channel IO mode (", channel, ")"), true)
+                return nil
+            end
+
+            self.db[channel] = IO_LVL.LOW
         else
-            -- should be unreachable code, we already validated channels
-            log.error(util.c(log_tag, "failed to identify advertisement channel IO mode (", channel, ")"), true)
+            log.error(util.c(log_tag, "invalid advertisement channel (", channel, ")"), true)
             return nil
         end
-
-        self.db[channel] = IO_LVL.LOW
     end
 
     -- PRIVATE FUNCTIONS --
diff --git a/supervisor/startup.lua b/supervisor/startup.lua
index 46ad6b4..54f4f54 100644
--- a/supervisor/startup.lua
+++ b/supervisor/startup.lua
@@ -13,7 +13,7 @@ local svsessions = require("supervisor.session.svsessions")
 local config     = require("supervisor.config")
 local supervisor = require("supervisor.supervisor")
 
-local SUPERVISOR_VERSION = "beta-v0.4.13"
+local SUPERVISOR_VERSION = "beta-v0.4.14"
 
 local print = util.print
 local println = util.println