diff --git a/atem-connection-rs/src/commands/device_profile/topology.rs b/atem-connection-rs/src/commands/device_profile/topology.rs
index 68fa16e..39f3d51 100644
--- a/atem-connection-rs/src/commands/device_profile/topology.rs
+++ b/atem-connection-rs/src/commands/device_profile/topology.rs
@@ -3,6 +3,7 @@ use std::sync::Arc;
 use crate::{
     commands::command_base::{CommandDeserializer, DeserializedCommand},
     enums::ProtocolVersion,
+    state::info::{AtemCapabilites, MultiviewerInfo},
 };
 
 pub const DESERIALIZE_TOPOLOGY_RAW_NAME: &str = "_top";
@@ -29,17 +30,43 @@ pub struct Topology {
 
 impl DeserializedCommand for Topology {
     fn raw_name(&self) -> &'static str {
-        todo!()
+        DESERIALIZE_TOPOLOGY_RAW_NAME
     }
 
     fn apply_to_state(&self, state: &mut crate::state::AtemState) {
-        todo!()
+        state.info.capabilities = Some(AtemCapabilites::new(
+            self.mix_effects,
+            self.sources,
+            self.auxilliaries,
+            self.mix_minus_outputs,
+            self.media_players,
+            self.serial_ports,
+            self.max_hyperdecks,
+            self.dves,
+            self.stingers,
+            self.super_sources,
+            self.talkback_channels,
+            self.downstream_keyers,
+            self.camera_control,
+            self.advanced_chroma_keyers,
+            self.only_configurable_outputs,
+        ));
+        if let Some(multiviewers) = self.multiviewers {
+            let window_count = if let Some(mv) = &state.info.multiviewer {
+                *mv.window_count()
+            } else {
+                10
+            };
+
+            state.info.multiviewer = Some(MultiviewerInfo::new(multiviewers, window_count))
+        }
     }
 }
 
-pub struct TopologyCommandDeserializer {}
+#[derive(Default)]
+pub struct TopologyDeserializer {}
 
-impl CommandDeserializer for TopologyCommandDeserializer {
+impl CommandDeserializer for TopologyDeserializer {
     fn deserialize(
         &self,
         buffer: &[u8],
diff --git a/atem-connection-rs/src/commands/parse_commands.rs b/atem-connection-rs/src/commands/parse_commands.rs
index cb7d854..acbd4a6 100644
--- a/atem-connection-rs/src/commands/parse_commands.rs
+++ b/atem-connection-rs/src/commands/parse_commands.rs
@@ -7,8 +7,11 @@ use crate::{
 
 use super::{
     command_base::{CommandDeserializer, DeserializedCommand},
-    device_profile::product_identifier::{
-        ProductIdentifierDeserializer, DESERIALIZE_PRODUCT_IDENTIFIER_RAW_NAME,
+    device_profile::{
+        product_identifier::{
+            ProductIdentifierDeserializer, DESERIALIZE_PRODUCT_IDENTIFIER_RAW_NAME,
+        },
+        topology::{TopologyDeserializer, DESERIALIZE_TOPOLOGY_RAW_NAME},
     },
     init_complete::{InitCompleteDeserializer, DESERIALIZE_INIT_COMPLETE_RAW_NAME},
     mix_effects::program_input::{ProgramInputDeserializer, DESERIALIZE_PROGRAM_INPUT_RAW_NAME},
@@ -64,6 +67,7 @@ fn command_deserializer_from_string(command_str: &str) -> Option<Box<dyn Command
         DESERIALIZE_PROGRAM_INPUT_RAW_NAME => Some(Box::<ProgramInputDeserializer>::default()),
         DESERIALIZE_TALLY_BY_SOURCE_RAW_NAME => Some(Box::<TallyBySourceDeserializer>::default()),
         DESERIALIZE_TIME_RAW_NAME => Some(Box::<TimeDeserializer>::default()),
+        DESERIALIZE_TOPOLOGY_RAW_NAME => Some(Box::<TopologyDeserializer>::default()),
         DESERIALIZE_PRODUCT_IDENTIFIER_RAW_NAME => {
             Some(Box::<ProductIdentifierDeserializer>::default())
         }
diff --git a/atem-connection-rs/src/state/info.rs b/atem-connection-rs/src/state/info.rs
index ce564cc..2f965f9 100644
--- a/atem-connection-rs/src/state/info.rs
+++ b/atem-connection-rs/src/state/info.rs
@@ -3,17 +3,17 @@ use crate::enums::{Model, ProtocolVersion};
 #[derive(Clone, PartialEq, Getters, new)]
 pub struct AtemCapabilites {
     mix_effects: u8,
-    sources: u64,
-    auxilliaries: u64,
-    mix_minus_outputs: u64,
-    media_players: u64,
-    serial_ports: u64,
-    max_hyperdecks: u64,
-    dves: u64,
-    stingers: u64,
-    super_sources: u64,
-    talkback_channels: u64,
-    downstream_keyers: u64,
+    sources: u8,
+    auxilliaries: u8,
+    mix_minus_outputs: u8,
+    media_players: u8,
+    serial_ports: u8,
+    max_hyperdecks: u8,
+    dves: u8,
+    stingers: u8,
+    super_sources: u8,
+    talkback_channels: u8,
+    downstream_keyers: u8,
     camera_control: bool,
     advanced_chroma_keyers: bool,
     only_configurable_outputs: bool,
@@ -55,8 +55,8 @@ pub struct MediaPoolInfo {
 
 #[derive(Clone, PartialEq, Getters, new)]
 pub struct MultiviewerInfo {
-    count: u64,
-    window_count: u64,
+    count: u8,
+    window_count: u8,
 }
 
 #[derive(Clone, PartialEq, new)]