diff -r 9cfbb344adc0 -r ff1b018a9b09 master/slave.c
--- a/master/slave.c	Fri Oct 13 09:39:42 2006 +0000
+++ b/master/slave.c	Fri Oct 13 09:45:22 2006 +0000
@@ -867,6 +867,18 @@
 /*****************************************************************************/
 
 /**
+   \return non-zero if slave is a bus coupler
+*/
+
+int ec_slave_has_subbus(const ec_slave_t *slave /**< EtherCAT slave */)
+{
+    return slave->sii_vendor_id == 0x00000002
+        && slave->sii_product_code == 0x13ED3052;
+}
+
+/*****************************************************************************/
+
+/**
    \return 0 in case of success, else < 0
 */