diff --git a/scenes/pribor-uyep/sch3-view.gd b/scenes/pribor-uyep/sch3-view.gd
index 91e6a4b5..b8e4e43a 100644
--- a/scenes/pribor-uyep/sch3-view.gd
+++ b/scenes/pribor-uyep/sch3-view.gd
@@ -19,6 +19,7 @@ var holding_stack: = []  ## Стек команд для чтения регис
 var input_stack:   = []  ## Стек команд для чтения регистров входов
 var read_step:     = 0
 var switches_sync: = false
+var timer = Timer.new()
 
 
 class StackItem:
@@ -62,9 +63,14 @@ func on_toggled_switch(val: bool, unit_sch3: sch_3.Sch3, meta: Array):
     if regs_holding.has(on_addr) and regs_holding.has(off_addr):
         regs_holding[on_addr]  = tools.set_bit(regs_holding[on_addr],  on_bit,  val)
         regs_holding[off_addr] = tools.set_bit(regs_holding[off_addr], off_bit, not val)
+    push_write_holding()
+
+
+## Заносит в очередь команду чтения регистров хранения
+func push_write_holding():
     var regs_data: = []
     var keys = regs_holding.keys()
-    keys.sort()
+    keys.sort()  # Ключи в словаре хранятся не упорядочено
     for addr in keys:
         regs_data.append(regs_holding[addr])
     write_stack.push_back(StackItem.new(keys[0], regs_data))
@@ -78,17 +84,24 @@ func _ready() -> void:
     var items = get_tree().get_nodes_in_group('bits_items_switch')
     for item in items:
         var meta = item.get_meta('bits')
-        item.connect('toggled', on_toggled_switch.bind(unit_sch3, meta))
+        item.connect('toggled', on_toggled_switch.bind(meta))
         item.disabled = true
     unit_sch3.connect('resp_input', on_resp_input)
     unit_sch3.connect('resp_holding', on_resp_holding)
-    var timer = Timer.new()
+    unit_sch3.connect('command_fail', on_command_fail)
     timer.connect('timeout', _on_timeout.bind(unit_sch3))
     add_child(timer)
-    timer.start(1.0)
+    timer.start(request_period)
 
 
-func on_line_changed(unit_sch3):
+func on_command_fail(unit_sch3):
+    unit_sch3.cmd_state = unit.Unit.CmdState.DONE
+    timer.stop()
+
+
+## Вызывается, когда состояния прибора Щ3 "на связи" изменяется[br]
+## [param unit_sch3] - Экземпляр представления прибора Щ3
+func on_line_changed(unit_sch3: sch_3.Sch3):
     for item in get_tree().get_nodes_in_group('bits_items_good'):
         item.texture = textures[STATE_VAL.NONE]
     if not unit_sch3.online:
@@ -100,6 +113,10 @@ func on_line_changed(unit_sch3):
         input_stack.clear()
         holding_stack.clear()
         switches_sync = false
+        $margin/vbox/grid1/lbl_freq.text = '<нет данных>'
+        $margin/vbox/grid1/state_freq.texture = textures[STATE_VAL.NONE]
+    else:
+        timer.start(request_period)
 
 
 func on_resp_holding(base_addr: int, data: Array):
@@ -108,14 +125,18 @@ func on_resp_holding(base_addr: int, data: Array):
     for i in data.size():
         regs_holding[base_addr + i] = data[i]
     if not switches_sync:
+        switches_sync = true
         for item in get_tree().get_nodes_in_group('bits_items_switch'):
             var bits = item.get_meta('bits')
-            var byte: int = bits[0]
-            var bit:  int = bits[1]
-            item.button_pressed = regs_holding[byte] & (1 << bit) > 0
+            var byte0: int = bits[0]  # Адрес регистра
+            var bit0:  int = bits[1]  # Индекс бита
+            var byte1: int = bits[2]  # Адрес регистра
+            var bit1:  int = bits[3]  # Индекс бита
+            var val0: bool = regs_holding[byte0] & (1 << bit0) > 0
+            item.button_pressed = val0
             item.disabled = false
-        switches_sync = true
-        $margin/vbox/grid1/lbl_freq.text = '<нет данных>'
+            regs_holding[byte1] = tools.set_bit(regs_holding[byte1], bit1, not val0)
+        push_write_holding()
 
 
 func on_resp_input(base_addr: int, data: Array):
@@ -130,6 +151,9 @@ func on_resp_input(base_addr: int, data: Array):
         regs_input[base_addr + i] = data[i]
     # Таблица 3.15, Регистр PowerState
     $margin/vbox/grid1/lbl_freq.text = '%d' % (regs_input[4] & 0x1ff)
+    $margin/vbox/grid1/state_freq.texture \
+        =    textures[STATE_VAL.GOOD] if regs_input[4] & (1 << 15) \
+        else textures[STATE_VAL.ERROR]
     var cnt_good: int = 0
     for item in items:
         var bits: Array = item.get_meta('bits')