diff --git a/include/villas/nodes/uldaq.h b/include/villas/nodes/uldaq.h
index 9e8071a19..874764c92 100644
--- a/include/villas/nodes/uldaq.h
+++ b/include/villas/nodes/uldaq.h
@@ -37,8 +37,24 @@
 extern "C" {
 #endif
 
+#include <uldaq.h>
+
+struct uldaq {
+	struct {
+		int sample_count;
+		double sample_rate;
+		ScanOption scan_options;
+		AInScanFlag flags;
+		AiQueueElement queues;
+	} in;
+
+	struct {
+		// TODO
+	} out;
+};
+
 #ifdef __cplusplus
 }
 #endif
 
-/** @} */
\ No newline at end of file
+/** @} */
diff --git a/lib/nodes/uldaq.c b/lib/nodes/uldaq.c
index be62e73ce..8f13f8284 100644
--- a/lib/nodes/uldaq.c
+++ b/lib/nodes/uldaq.c
@@ -28,6 +28,72 @@
 #include <villas/nodes/loopback.h>
 #include <villas/memory.h>
 
+static const struct {
+	const char *name,
+	Range range
+} ranges[] {
+	{ "BIP60VOLTS", BIP60VOLTS },		// -60 to +60 Volts
+	{ "BIP30VOLTS", BIP30VOLTS },		// -30 to +30 Volts
+	{ "BIP15VOLTS", BIP15VOLTS },		// -15 to +15 Volts
+	{ "BIP20VOLTS", BIP20VOLTS },		// -20 to +20 Volts
+	{ "BIP10VOLTS", BIP10VOLTS },		// -10 to +10 Volts
+	{ "BIP5VOLTS", BIP5VOLTS },		// -5 to +5 Volts
+	{ "BIP4VOLTS", BIP4VOLTS },		// -4 to +4 Volts
+	{ "BIP2PT5VOLTS", BIP2PT5VOLTS },	// -2.5 to +2.5 Volts
+	{ "BIP2VOLTS", BIP2VOLTS },		// -2.0 to +2.0 Volts
+	{ "BIP1PT25VOLTS", BIP1PT25VOLTS },	// -1.25 to +1.25 Volts
+	{ "BIP1VOLTS", BIP1VOLTS },		// -1 to +1 Volts
+	{ "BIPPT625VOLTS", BIPPT625VOLTS },	// -.625 to +.625 Volts
+	{ "BIPPT5VOLTS", BIPPT5VOLTS },		// -.5 to +.5 Volts
+	{ "BIPPT25VOLTS", BIPPT25VOLTS },	// -0.25 to +0.25 Volts
+	{ "BIPPT125VOLTS", BIPPT125VOLTS },	// -0.125 to +0.125 Volts
+	{ "BIPPT2VOLTS", BIPPT2VOLTS },		// -0.2 to +0.2 Volts
+	{ "BIPPT1VOLTS", BIPPT1VOLTS },		// -.1 to +.1 Volts
+	{ "BIPPT078VOLTS", BIPPT078VOLTS },	// -0.078 to +0.078 Volts
+	{ "BIPPT05VOLTS", BIPPT05VOLTS },	// -.05 to +.05 Volts
+	{ "BIPPT01VOLTS", BIPPT01VOLTS },	// -.01 to +.01 Volts
+	{ "BIPPT005VOLTS", BIPPT005VOLTS },	// -.005 to +.005 Volts
+	{ "UNI60VOLTS", UNI60VOLTS },		// 0 to +60 Volts
+	{ "UNI30VOLTS", UNI30VOLTS },		// 0 to +30 Volts
+	{ "UNI15VOLTS", UNI15VOLTS },		// 0 to +15 Volts
+	{ "UNI20VOLTS", UNI20VOLTS },		// 0 to +20 Volts
+	{ "UNI10VOLTS", UNI10VOLTS },		// 0 to +10 Volts
+	{ "UNI5VOLTS", UNI5VOLTS },		// 0 to +5 Volts
+	{ "UNI4VOLTS", UNI4VOLTS },		// 0 to +4 Volts
+	{ "UNI2PT5VOLTS", UNI2PT5VOLTS },	// 0 to +2.5 Volts
+	{ "UNI2VOLTS", UNI2VOLTS },		// 0 to +2.0 Volts
+	{ "UNI1PT25VOLTS", UNI1PT25VOLTS },	// 0 to +1.25 Volts
+	{ "UNI1VOLTS", UNI1VOLTS },		// 0 to +1 Volts
+	{ "UNIPT625VOLTS", UNIPT625VOLTS },	// 0 to +.625 Volts
+	{ "UNIPT5VOLTS", UNIPT5VOLTS },		// 0 to +.5 Volts
+	{ "UNIPT25VOLTS", UNIPT25VOLTS },	// 0 to +0.25 Volts
+	{ "UNIPT125VOLTS", UNIPT125VOLTS },	// 0 to +0.125 Volts
+	{ "UNIPT2VOLTS", UNIPT2VOLTS },		// 0 to +0.2 Volts
+	{ "UNIPT1VOLTS", UNIPT1VOLTS },		// 0 to +.1 Volts
+	{ "UNIPT078VOLTS", UNIPT078VOLTS },	// 0 to +0.078 Volts
+	{ "UNIPT05VOLTS", UNIPT05VOLTS },	// 0 to +.05 Volts
+	{ "UNIPT01VOLTS", UNIPT01VOLTS },	// 0 to +.01 Volts
+	{ "UNIPT005VOLTS", UNIPT005VOLTS }	// 0 to +.005 Volts
+};
+
+static Range uldaq_parse_range(const char *str)
+{
+}
+
+int uldaq_init(struct node *n)
+{
+	struct uldaq *u = (struct uldaq *) n->_vd;
+
+	u->in.queue_len = 0;
+	u->in.queues = alloc(sizeof(struct AiQueueElement) * u->in.queue_len);
+
+	// set some variables that are used to acquire data
+	int samplesPerChannel = 10000;
+	double rate = 1000;
+	ScanOption scanOptions = (ScanOption) (SO_DEFAULTIO | SO_CONTINUOUS);
+	AInScanFlag flags = AINSCAN_FF_DEFAULT;
+}
+
 int uldaq_start(struct node *n)
 {
 	int ret;
@@ -175,7 +241,7 @@ static struct plugin p = {
 	.node = {
 		.vectorize = 0,
 		.flags	= NODE_TYPE_PROVIDES_SIGNALS,
-		.size	= sizeof(struct loopback),
+		.size	= sizeof(struct uldaq),
 		.parse	= loopback_parse,
 		.print	= loopback_print,
 		.start	= uldaq_start,
@@ -185,4 +251,4 @@ static struct plugin p = {
 };
 
 REGISTER_PLUGIN(&p)
-LIST_INIT_STATIC(&p.node.instances)
\ No newline at end of file
+LIST_INIT_STATIC(&p.node.instances)