diff --git a/copyme.Settings.toml b/copyme.Settings.toml
index 24b446c..262751f 100644
--- a/copyme.Settings.toml
+++ b/copyme.Settings.toml
@@ -11,10 +11,10 @@ debug = "true"
 redis_url = "redis://127.0.0.1:6379/"
 
 # Either Helios or Etherdream
-dac_family = "Helios"
-
 # For Helios. USB Device Id of the DAC 
-dac_id = 0
+[dac.helios]
+id = 0
 
 # For Etherdream. IP of the DAC
-dac_url = "192.168.1.68"
+# [dac.etherdream]
+# url = "192.168.1.68"
diff --git a/examples/simple_client.rs b/examples/simple_client.rs
index c3ba977..a62c4cc 100644
--- a/examples/simple_client.rs
+++ b/examples/simple_client.rs
@@ -11,8 +11,12 @@ fn do_something() -> redis::RedisResult<()> {
 
     /* do something here */
     //let val : String = con.get("/pl/0/0")?;
-    let _ = con.set("/pl/0/0", "[(150.0, 230.0, 65280), (170.0, 170.0, 65280), (230.0, 170.0, 65280), (210.0, 230.0, 65280), (150.0, 230.0, 65280)]")?;
-
+    let _ = con.set("/pl/0/0", "[(150.0, 230.0, 65280), \
+				(170.0, 170.0, 65280), \
+				(230.0, 170.0, 65280), \
+				(210.0, 230.0, 65280), \
+				(150.0, 230.0, 65280)]")?;
+    
     Ok(())
 }
 
diff --git a/src/conf.rs b/src/conf.rs
index 87e85c8..4d64fb2 100644
--- a/src/conf.rs
+++ b/src/conf.rs
@@ -1,21 +1,31 @@
 use config::Config;
-use serde::Deserialize;
+use serde::{Serialize,Deserialize};
 use crate::errors::LJResult;
 
-#[derive(Deserialize, Debug)]
-pub enum DacFamily {
-    Helios,
-    Etherdream,
-}
-
-#[derive(Deserialize, Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 pub struct Conf {
     pub laser_id: u8,
     pub debug: bool,
     pub redis_url: String,
-    pub dac_family: DacFamily,
-    pub dac_id: Option<u8>,
-    pub dac_url: Option<String>,
+    pub dac: DacFamily
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub enum DacFamily {
+    #[serde(rename = "helios")] 
+    Helios(HeliosConf),
+    #[serde(rename = "etherdream")] 
+    Etherdream(EtherDreamConf),
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct HeliosConf {
+    pub id: u8
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct EtherDreamConf {
+    pub url: String
 }
 
 impl Conf {
diff --git a/tests/settings/valid.toml b/tests/settings/valid.toml
index 1d9689c..262751f 100644
--- a/tests/settings/valid.toml
+++ b/tests/settings/valid.toml
@@ -1,4 +1,5 @@
-# file: valid.toml
+# file: Settings.toml
+# Rename me !
 
 # The main key of your laser in LJ
 laser_id = 0
@@ -6,14 +7,14 @@ laser_id = 0
 # Activate for more debug 
 debug = "true"
 
-# Redis URL as IP:port  
-redis_url = "127.0.0.1"
+# Redis URL as redis://IP:port/
+redis_url = "redis://127.0.0.1:6379/"
 
 # Either Helios or Etherdream
-dac_family = "Helios"
-
 # For Helios. USB Device Id of the DAC 
-dac_id = 0
+[dac.helios]
+id = 0
 
 # For Etherdream. IP of the DAC
-dac_url = "192.168.1.68"
+# [dac.etherdream]
+# url = "192.168.1.68"
diff --git a/tests/settings/valid_etherdream.toml b/tests/settings/valid_etherdream.toml
new file mode 100644
index 0000000..b136ccf
--- /dev/null
+++ b/tests/settings/valid_etherdream.toml
@@ -0,0 +1,15 @@
+# file: Settings.toml
+# Rename me !
+
+# The main key of your laser in LJ
+laser_id = 0
+
+# Activate for more debug 
+debug = "true"
+
+# Redis URL as redis://IP:port/
+redis_url = "redis://127.0.0.1:6379/"
+
+# For Etherdream. IP of the DAC
+[dac.etherdream]
+url = "192.168.1.68"
diff --git a/tests/test_conf.rs b/tests/test_conf.rs
index 72dc44e..1c7b77b 100644
--- a/tests/test_conf.rs
+++ b/tests/test_conf.rs
@@ -1,4 +1,4 @@
-use lj_rust::conf::{Conf, DacFamily};
+use lj_rust::conf::{Conf, DacFamily, HeliosConf, EtherDreamConf};
 
 #[test]
 fn it_loads_a_valid_conf() {
@@ -14,19 +14,21 @@ fn it_fails_invalid_conf() {
 
 #[test]
 fn it_finds_struct_fields() {
-    let config = match Conf::new("tests/settings/valid") {
-        Ok(c) => c,
-        Err(err) => {
-            panic!("Unable to load config file: {:?}", err)
-        }
-    };
-    assert_eq!(config.laser_id, u8::from(0));
+    let config = Conf::new("tests/settings/valid").unwrap();
+    assert_eq!(config.laser_id, 0);
     assert_eq!(config.debug, true);
-    assert_eq!(config.redis_url, String::from("127.0.0.1"));
-    assert!(match config.dac_family {
-        DacFamily::Helios => true,
+    assert_eq!(config.redis_url, "redis://127.0.0.1:6379/");
+    assert!(match config.dac {
+        DacFamily::Helios(HeliosConf { id: 0 }) => true,
+        _ => false,
+    });
+}
+
+#[test]
+fn it_finds_etherdream_fields() {
+    let config = Conf::new("tests/settings/valid_etherdream").unwrap();
+    assert!(match config.dac {
+        DacFamily::Etherdream(EtherDreamConf { url }) if url == "192.168.1.68" => true,
         _ => false,
     });
-    assert_eq!(config.dac_id, Some(0));
-    assert_eq!(config.dac_url, Some(String::from("192.168.1.68")));
 }