diff --git a/rtu/config/redstone.lua b/rtu/config/redstone.lua
index 2ec8cab..c7a7e19 100644
--- a/rtu/config/redstone.lua
+++ b/rtu/config/redstone.lua
@@ -20,6 +20,7 @@ local NumberField = require("graphics.elements.form.NumberField")
 ---@field port IO_PORT
 ---@field side side
 ---@field color color|nil
+---@field invert true|nil
 
 local tri = util.trinary
 
diff --git a/rtu/dev/redstone_rtu.lua b/rtu/dev/redstone_rtu.lua
index c073250..8c3e5ee 100644
--- a/rtu/dev/redstone_rtu.lua
+++ b/rtu/dev/redstone_rtu.lua
@@ -33,16 +33,21 @@ function redstone_rtu.new()
     -- link digital input
     ---@param side string
     ---@param color integer
-    function public.link_di(side, color)
+    ---@param invert boolean|nil
+    function public.link_di(side, color, invert)
         local f_read    ---@type function
 
         if color then
-            f_read = function ()
-                return digital_read(rs.testBundledInput(side, color))
+            if invert then
+                f_read = function () return digital_read(not rs.testBundledInput(side, color)) end
+            else
+                f_read = function () return digital_read(rs.testBundledInput(side, color)) end
             end
         else
-            f_read = function ()
-                return digital_read(rs.getInput(side))
+            if invert then
+                f_read = function () return digital_read(not rs.getInput(side)) end
+            else
+                f_read = function () return digital_read(rs.getInput(side)) end
             end
         end
 
@@ -52,36 +57,58 @@ function redstone_rtu.new()
     -- link digital output
     ---@param side string
     ---@param color integer
-    function public.link_do(side, color)
+    ---@param invert boolean|nil
+    function public.link_do(side, color, invert)
         local f_read    ---@type function
         local f_write   ---@type function
 
         if color then
-            f_read = function ()
-                return digital_read(colors.test(rs.getBundledOutput(side), color))
-            end
+            if invert then
+                f_read = function () return digital_read(not colors.test(rs.getBundledOutput(side), color)) end
 
-            f_write = function (level)
-                if level ~= IO_LVL.FLOATING and level ~= IO_LVL.DISCONNECT then
-                    local output = rs.getBundledOutput(side)
+                f_write = function (level)
+                    if level ~= IO_LVL.FLOATING and level ~= IO_LVL.DISCONNECT then
+                        local output = rs.getBundledOutput(side)
 
-                    if digital_write(level) then
-                        output = colors.combine(output, color)
-                    else
-                        output = colors.subtract(output, color)
+                        -- inverted conditions
+                        if digital_write(level) then
+                            output = colors.subtract(output, color)
+                        else output = colors.combine(output, color) end
+
+                        rs.setBundledOutput(side, output)
                     end
+                end
+            else
+                f_read = function () return digital_read(colors.test(rs.getBundledOutput(side), color)) end
 
-                    rs.setBundledOutput(side, output)
+                f_write = function (level)
+                    if level ~= IO_LVL.FLOATING and level ~= IO_LVL.DISCONNECT then
+                        local output = rs.getBundledOutput(side)
+
+                        if digital_write(level) then
+                            output = colors.combine(output, color)
+                        else output = colors.subtract(output, color) end
+
+                        rs.setBundledOutput(side, output)
+                    end
                 end
             end
         else
-            f_read = function ()
-                return digital_read(rs.getOutput(side))
-            end
+            if invert then
+                f_read = function () return digital_read(not rs.getOutput(side)) end
 
-            f_write = function (level)
-                if level ~= IO_LVL.FLOATING and level ~= IO_LVL.DISCONNECT then
-                    rs.setOutput(side, digital_write(level))
+                f_write = function (level)
+                    if level ~= IO_LVL.FLOATING and level ~= IO_LVL.DISCONNECT then
+                        rs.setOutput(side, not digital_write(level))
+                    end
+                end
+            else
+                f_read = function () return digital_read(rs.getOutput(side)) end
+
+                f_write = function (level)
+                    if level ~= IO_LVL.FLOATING and level ~= IO_LVL.DISCONNECT then
+                        rs.setOutput(side, digital_write(level))
+                    end
                 end
             end
         end
@@ -92,23 +119,15 @@ function redstone_rtu.new()
     -- link analog input
     ---@param side string
     function public.link_ai(side)
-        unit.connect_input_reg(
-            function ()
-                return rs.getAnalogInput(side)
-            end
-        )
+        unit.connect_input_reg(function () return rs.getAnalogInput(side) end)
     end
 
     -- link analog output
     ---@param side string
     function public.link_ao(side)
         unit.connect_holding_reg(
-            function ()
-                return rs.getAnalogOutput(side)
-            end,
-            function (value)
-                rs.setAnalogOutput(side, value)
-            end
+            function () return rs.getAnalogOutput(side) end,
+            function (value) rs.setAnalogOutput(side, value) end
         )
     end
 
diff --git a/rtu/startup.lua b/rtu/startup.lua
index 01a05a9..686c6b4 100644
--- a/rtu/startup.lua
+++ b/rtu/startup.lua
@@ -31,7 +31,7 @@ local sna_rtu      = require("rtu.dev.sna_rtu")
 local sps_rtu      = require("rtu.dev.sps_rtu")
 local turbinev_rtu = require("rtu.dev.turbinev_rtu")
 
-local RTU_VERSION = "v1.11.7"
+local RTU_VERSION = "v1.11.8"
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 local RTU_HW_STATE = databus.RTU_HW_STATE