diff --git a/esphome/components/modbus_controller/output/__init__.py b/esphome/components/modbus_controller/output/__init__.py
index 1ec4afd997..27d212d58d 100644
--- a/esphome/components/modbus_controller/output/__init__.py
+++ b/esphome/components/modbus_controller/output/__init__.py
@@ -11,6 +11,7 @@ from .. import (
     modbus_controller_ns,
 )
 from ..const import (
+    CONF_CUSTOM_COMMAND,
     CONF_MODBUS_CONTROLLER_ID,
     CONF_REGISTER_TYPE,
     CONF_USE_WRITE_MULTIPLE,
@@ -35,6 +36,10 @@ CONFIG_SCHEMA = cv.typed_schema(
         "coil": output.BINARY_OUTPUT_SCHEMA.extend(ModbusItemBaseSchema).extend(
             {
                 cv.GenerateID(): cv.declare_id(ModbusBinaryOutput),
+                cv.Required(CONF_ADDRESS): cv.positive_int,
+                cv.Optional(CONF_CUSTOM_COMMAND): cv.invalid(
+                    "custom_command is not supported for outputs"
+                ),
                 cv.Optional(CONF_WRITE_LAMBDA): cv.returning_lambda,
                 cv.Optional(CONF_USE_WRITE_MULTIPLE, default=False): cv.boolean,
             }
@@ -42,6 +47,10 @@ CONFIG_SCHEMA = cv.typed_schema(
         "holding": output.FLOAT_OUTPUT_SCHEMA.extend(ModbusItemBaseSchema).extend(
             {
                 cv.GenerateID(): cv.declare_id(ModbusFloatOutput),
+                cv.Required(CONF_ADDRESS): cv.positive_int,
+                cv.Optional(CONF_CUSTOM_COMMAND): cv.invalid(
+                    "custom_command is not supported for outputs"
+                ),
                 cv.Optional(CONF_VALUE_TYPE, default="U_WORD"): cv.enum(
                     SENSOR_VALUE_TYPE
                 ),
diff --git a/esphome/components/modbus_controller/text_sensor/__init__.py b/esphome/components/modbus_controller/text_sensor/__init__.py
index 995357143e..93ecd31168 100644
--- a/esphome/components/modbus_controller/text_sensor/__init__.py
+++ b/esphome/components/modbus_controller/text_sensor/__init__.py
@@ -61,7 +61,7 @@ async def to_code(config):
     response_size = config[CONF_RESPONSE_SIZE]
     reg_count = config[CONF_REGISTER_COUNT]
     if reg_count == 0:
-        reg_count = response_size / 2
+        reg_count = response_size // 2
     var = cg.new_Pvariable(
         config[CONF_ID],
         config[CONF_REGISTER_TYPE],