diff --git a/docs/GoodWe-RS485-Field-Guide.pdf b/docs/GoodWe-RS485-Field-Guide.pdf
index 42f4264..cfada9f 100644
Binary files a/docs/GoodWe-RS485-Field-Guide.pdf and b/docs/GoodWe-RS485-Field-Guide.pdf differ
diff --git a/goodwe_controller/app/mqtt.py b/goodwe_controller/app/mqtt.py
index 56d54cf..d9284d6 100644
--- a/goodwe_controller/app/mqtt.py
+++ b/goodwe_controller/app/mqtt.py
@@ -29,7 +29,7 @@ _LOG = logging.getLogger("goodwe.mqtt")
 DEVICE = {
     "identifiers": ["goodwe_rs485_controller"],
     "name": "GoodWe",
-    "manufacturer": "GoodWe (via RS485 meter emulation)",
+    "manufacturer": "GoodWe (via RS485 EMS port)",
     "model": "ES/BP series",
 }
 
diff --git a/goodwe_controller/test_mqtt.py b/goodwe_controller/test_mqtt.py
index 5e4a5b7..8e8729c 100644
--- a/goodwe_controller/test_mqtt.py
+++ b/goodwe_controller/test_mqtt.py
@@ -104,7 +104,7 @@ def check(name, cond):
 # release/1.0 rather than against release/1.0.
 # ---------------------------------------------------------------------------
 _DEV = ('{"identifiers": ["goodwe_rs485_controller"], "name": "GoodWe", '
-        '"manufacturer": "GoodWe (via RS485 meter emulation)", '
+        '"manufacturer": "GoodWe (via RS485 EMS port)", '
         '"model": "ES/BP series"}')
 
 BASELINE = [