diff --git a/src/wmbus.h b/src/wmbus.h
index e6034fb..6807411 100644
--- a/src/wmbus.h
+++ b/src/wmbus.h
@@ -27,6 +27,8 @@
 #define LIST_OF_LINK_MODES \
     X(Any,--anylinkmode) \
     X(C1,--c1) \
+    X(S1,--s1) \
+    X(S1m,--s1m) \
     X(T1,--t1) \
     X(N1a,--n1a) \
     X(N1b,--n1b) \
diff --git a/src/wmbus_amb8465.cc b/src/wmbus_amb8465.cc
index f2bdf20..5e1448c 100644
--- a/src/wmbus_amb8465.cc
+++ b/src/wmbus_amb8465.cc
@@ -196,6 +196,8 @@ void WMBusAmber::getConfiguration()
 
 void WMBusAmber::setLinkMode(LinkMode lm) {
     if (lm != LinkMode::C1 &&
+        lm != LinkMode::S1 &&
+        lm != LinkMode::S1m &&
         lm != LinkMode::T1)
     {
         error("LinkMode %d is not implemented for amb8465\n", (int)lm);
@@ -209,9 +211,16 @@ void WMBusAmber::setLinkMode(LinkMode lm) {
     sent_command_ = msg[1];
     msg[2] = 1; // Len
     if (lm == LinkMode::C1) {
-        msg[3] = 0x0E; // Reception of C1 and C2 messages
-    } if (lm == LinkMode::T1) {
-        msg[3] = 0x05; // T1-Meter
+        msg[3] = 0x0E;
+    } else
+    if (lm == LinkMode::S1) {
+        msg[3] = 0x01;
+    } else
+    if (lm == LinkMode::S1m) {
+        msg[3] = 0x02;
+    } else
+    if (lm == LinkMode::T1) {
+        msg[3] = 0x05;
     }
     msg[4] = xorChecksum(msg, 4);
 
diff --git a/src/wmbus_im871a.cc b/src/wmbus_im871a.cc
index bc5aa6c..7430b4b 100644
--- a/src/wmbus_im871a.cc
+++ b/src/wmbus_im871a.cc
@@ -166,6 +166,12 @@ LinkMode WMBusIM871A::getLinkMode() {
             if (received_payload_[offset] == (int)LinkModeIM871A::C1a) {
                 lm = LinkMode::C1;
             }
+            if (received_payload_[offset] == (int)LinkModeIM871A::S1) {
+                lm = LinkMode::S1;
+            }
+            if (received_payload_[offset] == (int)LinkModeIM871A::S1m) {
+                lm = LinkMode::S1m;
+            }
             if (received_payload_[offset] == (int)LinkModeIM871A::T1) {
                 lm = LinkMode::T1;
             }
@@ -268,6 +274,8 @@ LinkMode WMBusIM871A::getLinkMode() {
 void WMBusIM871A::setLinkMode(LinkMode lm)
 {
     if (lm != LinkMode::C1 &&
+        lm != LinkMode::S1 &&
+        lm != LinkMode::S1m &&
         lm != LinkMode::T1 &&
         lm != LinkMode::N1a &&
         lm != LinkMode::N1b &&
@@ -289,6 +297,10 @@ void WMBusIM871A::setLinkMode(LinkMode lm)
     msg[5] = 2; // iff1 bits: Set Radio Mode
     if (lm == LinkMode::C1) {
         msg[6] = (int)LinkModeIM871A::C1a;
+    } else if (lm == LinkMode::S1) {
+        msg[6] = (int)LinkModeIM871A::S1;
+    } else if (lm == LinkMode::S1m) {
+        msg[6] = (int)LinkModeIM871A::S1m;
     } else if (lm == LinkMode::T1) {
         msg[6] = (int)LinkModeIM871A::T1;
     } else if (lm == LinkMode::N1a) {
diff --git a/src/wmbus_im871a.h b/src/wmbus_im871a.h
index 2055419..9a54c89 100644
--- a/src/wmbus_im871a.h
+++ b/src/wmbus_im871a.h
@@ -57,6 +57,7 @@
 #define HWTEST_MSG_RADIOTEST_REQ 0x01
 #define HWTEST_MSG_RADIOTEST_RSP 0x02
 
+// LinkModeIM871A::S1 is 0, S1m is 1 etc. These numbers are what the dongle requires.
 #define LIST_OF_IM871A_LINK_MODES X(S1)X(S1m)X(S2)X(T1)X(T2)X(R2)X(C1a)X(C1b)X(C2a)X(C2b) \
     X(N1A)X(N2A)X(N1B)X(N2B)X(N1C)X(N2C)X(N1D)X(N2D)X(N1E)X(N2E)X(N1F)X(N2F)X(UNKNOWN)