--- a/include/ecrt.h	Mon Sep 22 15:26:54 2008 +0000
+++ b/include/ecrt.h	Mon Sep 22 15:27:50 2008 +0000
@@ -923,9 +923,21 @@
  * VoE handler methods.
  ****************************************************************************/
 
+/** Sets the VoE header containing vendor ID and vendor type.
+ *
+ * A VoE message shall contain a 4-byte vendor ID, followed by a 2-byte vendor
+ * type at as header. These numbers can be set with this function.
+ */
+void ecrt_voe_handler_header(
+        ec_voe_handler_t *voe, /**< VoE handler. */
+        uint32_t vendor_id, /**< Vendor ID. */
+        uint16_t vendor_type /**< Vendor-specific type. */
+        );
+
 /** Access to the VoE handler's data.
  *
- * This function returns a pointer to the handler's internal memory.
+ * This function returns a pointer to the VoE handler's internal memory, after
+ * the VoE header (see ecrt_voe_handler_header()).
  *
  * - After a read operation was successful, the memory contains the received
  *   data. The size of the received data can be determined via
@@ -942,6 +954,9 @@
 
 /** Returns the current data size.
  *
+ * The data size is the size of the VoE data without the header (see
+ * ecrt_voe_handler_header()).
+ *
  * When the VoE handler is created, the data size is set to the size of the
  * reserved memory. At a write operation, the data size is set to the number
  * of bytes to write. After a read operation the size is set to the size of
@@ -960,7 +975,7 @@
  */
 void ecrt_voe_handler_write(
         ec_voe_handler_t *voe, /**< VoE handler. */
-        size_t size /**< Number of bytes to write. */
+        size_t size /**< Number of bytes to write (without the VoE header). */
         );
 
 /** Start a VoE read operation.

--- a/master/voe_handler.c	Mon Sep 22 15:26:54 2008 +0000
+++ b/master/voe_handler.c	Mon Sep 22 15:27:50 2008 +0000
@@ -48,6 +48,10 @@
  */
 #define EC_MBOX_TYPE_VOE 0xff
 
+/** VoE header size.
+ */
+#define EC_VOE_HEADER_SIZE 6
+
 /** VoE response timeout in [ms].
  */
 #define EC_VOE_RESPONSE_TIMEOUT 500
@@ -77,13 +81,16 @@
         )
 {
     voe->config = sc;
+    voe->vendor_id = 0x00000000;
+    voe->vendor_type = 0x0000;
     voe->data_size = 0;
     voe->dir = EC_DIR_INVALID;
     voe->state = ec_voe_handler_state_error;
     voe->request_state = EC_INT_REQUEST_INIT;
 
     ec_datagram_init(&voe->datagram);
-    if (ec_datagram_prealloc(&voe->datagram, size + 6))
+    if (ec_datagram_prealloc(&voe->datagram,
+                size + EC_MBOX_HEADER_SIZE + EC_VOE_HEADER_SIZE))
         return -1;
 
     return 0;
@@ -104,9 +111,18 @@
  * Application interface.
  ****************************************************************************/
 
+void ecrt_voe_handler_header(ec_voe_handler_t *voe, uint32_t vendor_id,
+        uint16_t vendor_type)
+{
+    voe->vendor_id = vendor_id;
+    voe->vendor_type = vendor_type;
+}
+
+/*****************************************************************************/
+
 uint8_t *ecrt_voe_handler_data(ec_voe_handler_t *voe)
 {
-    return voe->datagram.data + 6;
+    return voe->datagram.data + EC_MBOX_HEADER_SIZE + EC_VOE_HEADER_SIZE;
 }
 
 /*****************************************************************************/
@@ -130,7 +146,7 @@
 void ecrt_voe_handler_write(ec_voe_handler_t *voe, size_t size)
 {
     voe->dir = EC_DIR_OUTPUT;
-    voe->datagram.data_size = size + 6;
+    voe->data_size = size;
     voe->state = ec_voe_handler_state_write_start;
     voe->request_state = EC_INT_REQUEST_QUEUED;
 }
@@ -174,11 +190,14 @@
     }
 	
     if (!(data = ec_slave_mbox_prepare_send(slave, &voe->datagram,
-                    EC_MBOX_TYPE_VOE, voe->data_size))) {
-        voe->state = ec_voe_handler_state_error;
-        voe->request_state = EC_INT_REQUEST_FAILURE;
-        return;
-    }
+                    EC_MBOX_TYPE_VOE, EC_VOE_HEADER_SIZE + voe->data_size))) {
+        voe->state = ec_voe_handler_state_error;
+        voe->request_state = EC_INT_REQUEST_FAILURE;
+        return;
+    }
+
+    EC_WRITE_U32(data,     voe->vendor_id);
+    EC_WRITE_U16(data + 4, voe->vendor_type);
 
     voe->retries = EC_FSM_RETRIES;
     voe->jiffies_start = jiffies;
@@ -353,12 +372,19 @@
         return;
     }
 
+    if (rec_size < EC_VOE_HEADER_SIZE) {
+        voe->state = ec_voe_handler_state_error;
+        voe->request_state = EC_INT_REQUEST_FAILURE;
+        EC_ERR("Received VoE header is incomplete (%u bytes)!\n", rec_size);
+        return;
+    }
+
     if (master->debug_level) {
         EC_DBG("VoE data:\n");
         ec_print_data(data, rec_size);
     }
 
-    voe->data_size = rec_size;
+    voe->data_size = rec_size - EC_VOE_HEADER_SIZE;
     voe->request_state = EC_INT_REQUEST_SUCCESS;
     voe->state = ec_voe_handler_state_end; // success
 }
@@ -379,6 +405,7 @@
 
 /** \cond */
 
+EXPORT_SYMBOL(ecrt_voe_handler_header);
 EXPORT_SYMBOL(ecrt_voe_handler_data);
 EXPORT_SYMBOL(ecrt_voe_handler_data_size);
 EXPORT_SYMBOL(ecrt_voe_handler_read);

--- a/master/voe_handler.h	Mon Sep 22 15:26:54 2008 +0000
+++ b/master/voe_handler.h	Mon Sep 22 15:27:50 2008 +0000
@@ -54,6 +54,8 @@
     struct list_head list; /**< List item. */
     ec_slave_config_t *config; /**< Parent slave configuration. */
     ec_datagram_t datagram; /**< State machine datagram. */
+    uint32_t vendor_id; /**< Vendor ID for the header. */
+    uint16_t vendor_type; /**< Vendor type for the header. */
     size_t data_size; /**< Size of Sdo data. */
     ec_direction_t dir; /**< Direction. EC_DIR_OUTPUT means writing to
                           the slave, EC_DIR_INPUT means reading from the