diff --git a/data.db b/data.db
index 4b0af30..e469ca1 100644
Binary files a/data.db and b/data.db differ
diff --git a/index.d.ts b/index.d.ts
index c114aae..369ca53 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -10,8 +10,8 @@ export type AppConfig = {
   log_interval_ms: number;
 };
 
-export type RegisterType = "HR" | "IR" 
-export type NumberType = 'UI16' | 'I16' | 'UI32' | 'I32' | 'FP32'
+export type RegisterType = "HR" | "IR" | "DI" | "DO";
+export type NumberType = 'UI16' | 'I16' | 'UI32' | 'I32' | 'FP32' | 'BOOL';
 
 export type DisplayValue = {
   data?: number;
diff --git a/migrations/001-init.sql b/migrations/001-init.sql
index bb9ad93..08f6fa3 100644
--- a/migrations/001-init.sql
+++ b/migrations/001-init.sql
@@ -34,8 +34,8 @@ CREATE TABLE IF NOT EXISTS "display_values" (
 	"name" VARCHAR(32) NOT NULL,
 	"slave_id" INTEGER NOT NULL,
 	"reg_addr" INTEGER DEFAULT 0 NOT NULL CHECK(reg_addr >= 0 AND reg_addr <= 65534),
-	"reg_type" VARCHAR(3) NOT NULL CHECK(reg_type IN("HR", "IR")) DEFAULT "IR",
-	"reg_format" VARCHAR(5) NOT NULL CHECK(reg_format IN("UI16", "I16", "UI32", "I32", "FP32")) DEFAULT "UI16",
+	"reg_type" VARCHAR(3) NOT NULL CHECK(reg_type IN("HR", "IR", "DI", "DO")) DEFAULT "IR",
+	"reg_format" VARCHAR(5) NOT NULL CHECK(reg_format IN("UI16", "I16", "UI32", "I32", "FP32", "BOOL")) DEFAULT "UI16",
 	PRIMARY KEY("id"),
 	FOREIGN KEY("slave_id") REFERENCES modbus_slaves("id") ON DELETE CASCADE
 );
@@ -48,7 +48,7 @@ CREATE TABLE IF NOT EXISTS "display_values" (
 -- 	-- JSON Format: 
 -- 	-- {
 -- 	-- 	graph: [{ reg_addr: 1 value: 4 }],
--- 	-- 	display_values: [{ reg_addr: 1, name: "CV1" }]
+-- 	-- 	display_values: [{ ... }]
 -- 	-- }
 -- 	"data" TEXT NOT NULL,
 -- 	PRIMARY KEY("id"),
@@ -74,7 +74,10 @@ INSERT INTO "display_values" (
 	(6, "SP", 2, 15, "UI16", "IR"),
 	(7, "CV1", 3, 16, "UI16", "HR"),
 	(8, "CV2", 3, 17, "FP32", "HR"),
-	(9, "SP", 3, 15, "UI16", "IR");
+	(9, "SP", 3, 15, "UI16", "IR"),
+	(10, "Control action type", 3, 0, "BOOL", "DI"),
+	(11, "Status ALARM1", 3, 1, "BOOL", "DO"),
+	(12, "Status ALARM2", 3, 2, "BOOL", "DO");
 --------------------------------------------------------------------------------
 -- Down
 --------------------------------------------------------------------------------
diff --git a/public/index.html b/public/index.html
index cd81eac..c5bc604 100644
--- a/public/index.html
+++ b/public/index.html
@@ -287,7 +287,7 @@
                       <template x-for="value in selectedDevice?.display_values" :key="value.id">
                         <div class="border-2 p-2.5 rounded-sm">
                           <div class="flex justify-between items-start">
-                            <h3 x-text="value.name" class="text-xl font-bold"></h3>
+                            <h3 x-text="value.name" class="text-lg font-bold"></h3>
                             <div class="flex">
                               <!-- Edit display value -->
                               <button>
@@ -318,19 +318,19 @@
                           </div>
                           <hr />
                           <div class="flex flex-col">
-                            <span
-                              >Value:
-                              <span
-                                x-text="Number.isInteger(value?.data) ? value?.data : value?.data?.toFixed(3)"
-                              ></span
-                            ></span>
+                            <span>Value:
+                              <span x-show="value?.reg_format === 'BOOL'"><input :value="Boolean(value?.data)" type="checkbox" onclick="return false;" /></span>
+                              <span x-show="value?.reg_format !== 'BOOL'" x-text="Number.isInteger(value?.data) ? value?.data : value?.data?.toFixed(3)"></span>
+                            </span>
                             <span>Reg Addr: <span x-text="value?.reg_addr"></span></span>
                             <span>Reg Type: <span x-text="value?.reg_type"></span></span>
                             <span>Format: <span x-text="value?.reg_format"></span></span>
                           </div>
                         </div>
                       </template>
+                      <!-- Create Display -->
                       <div
+                        @click="$dispatch('open-create-display-value-modal')"
                         class="flex justify-center min-h-[140px] items-center border-4 text-center border-dashed p-2.5 rounded-sm cursor-pointer hover:bg-gray-50"
                       >
                         <span class="text-5xl text-gray-400 font-bold select-none">+</span>
diff --git a/services/modbus.service.js b/services/modbus.service.js
index 0799227..9afa17d 100644
--- a/services/modbus.service.js
+++ b/services/modbus.service.js
@@ -82,7 +82,7 @@ export const modbusService = {
 
   /**
    * @param {number} addr
-   * @param {"HR" | "IR" | "DI"} type
+   * @param {import("..").RegisterType} type
    * @param {import("..").NumberType} format
    * @return {Promise<Buffer>} buffer data
    */
@@ -108,7 +108,10 @@ export const modbusService = {
         data = await modbusClient.readInputRegisters(addr, len);
         break;
       case "DI":
-        data = await modbusClient.readDiscreteInputs(addr, len);
+        data = await modbusClient.readDiscreteInputs(addr, 1);
+        break;
+      case "DO":
+        data = await modbusClient.readCoils(addr, 1);
         break;
       default:
         throw new Error("Incorrect modbus register type!");
diff --git a/utils/number.js b/utils/number.js
index 97484e9..e6829b7 100644
--- a/utils/number.js
+++ b/utils/number.js
@@ -18,4 +18,6 @@ export function readNumberFromBuf(buf, type, order) {
   if (type === 'UI32' && order === 'LE') return Buffer.from(buf).readUint32LE();
   if (type === 'I32' && order === 'LE') return Buffer.from(buf).readInt32LE();
   if (type === 'FP32' && order === 'LE') return Buffer.from(buf).readFloatLE();
+
+  if (type === 'BOOL') return Buffer.from(buf).readUint8();
 }
\ No newline at end of file
diff --git a/validators/display-value.schema.js b/validators/display-value.schema.js
index 3e3259c..e2e13e6 100644
--- a/validators/display-value.schema.js
+++ b/validators/display-value.schema.js
@@ -5,8 +5,8 @@ export const displayValueSchema = object({
   name: string().required(),
   slave_id: number().required(),
   reg_addr: number().min(0).max(65534).required(),
-  reg_format: string().oneOf(["UI16", "I16", "UI32", "I32", "FP32"]).required(),
-  reg_type: string().oneOf(["HR", "IR"]).required()
+  reg_format: string().oneOf(["UI16", "I16", "UI32", "I32", "FP32", "BOOL"]).required(),
+  reg_type: string().oneOf(["HR", "IR", "DI", "DO"]).required()
 })
 
 export const removeDisplayValueSchema = displayValueSchema.pick(['id']);
\ No newline at end of file