diff --git a/master/sync.c b/master/sync.c
index 0d968d17a311b5843bacbeb0692ebcec3aa6c6bb..e0fc12739bdcca2895e9afe3050c15328b882a48 100644
--- a/master/sync.c
+++ b/master/sync.c
@@ -195,3 +195,26 @@ void ec_sync_clear_pdos(
 }
 
 /*****************************************************************************/
+
+/**
+ */
+
+ec_pdo_type_t ec_sync_get_pdo_type(
+        const ec_sync_t *sync /**< EtherCAT sync manager */
+        )
+{
+    int index = sync->index;
+
+    if (sync->slave && sync->slave->sii_mailbox_protocols) {
+        index -= 2;
+    }
+
+    if (index < 0 || index > 1) {
+        EC_WARN("ec_sync_get_pdo_type(): invalid sync manager index.\n");
+        return EC_RX_PDO;
+    }
+
+    return (ec_pdo_type_t) index;
+}
+
+/*****************************************************************************/
diff --git a/master/sync.h b/master/sync.h
index 11255a997c0260bdc3db3ea09cad39e3f374a78f..fca77151c9093f116eebfef41e9eaa092495a014 100644
--- a/master/sync.h
+++ b/master/sync.h
@@ -83,6 +83,8 @@ void ec_sync_config(const ec_sync_t *, uint8_t *);
 int ec_sync_add_pdo(ec_sync_t *, const ec_pdo_t *);
 void ec_sync_clear_pdos(ec_sync_t *);
 
+ec_pdo_type_t ec_sync_get_pdo_type(const ec_sync_t *);
+
 /*****************************************************************************/
 
 #endif