diff --git a/src/LabjackYaesu.zig b/src/LabjackYaesu.zig
index bb46b01..984f55e 100644
--- a/src/LabjackYaesu.zig
+++ b/src/LabjackYaesu.zig
@@ -159,6 +159,7 @@ const Controller = struct {
 
     fn connectLabjack(self: *Controller) !void {
         const info = try self.labjack.connect();
+        try self.labjack.setAllDigitalOutputLow();
         self.labjack.id = info.local_id;
     }
 
diff --git a/src/labjack.zig b/src/labjack.zig
index f350f7f..eb5240b 100644
--- a/src/labjack.zig
+++ b/src/labjack.zig
@@ -6,7 +6,7 @@ pub fn getDriverVersion() f32 {
 
 pub const Labjack = struct {
     id: ?i32 = null,
-    demo: bool = false,
+    demobit: bool = false,
 
     pub fn autodetect() Labjack {
         return .{};
@@ -36,6 +36,37 @@ pub const Labjack = struct {
             version;
     }
 
+    pub fn setAllDigitalOutputLow(self: Labjack) LabjackError!void {
+        var id = self.cId();
+
+        // bitmask. D0 to D15 (LSB is D0). 0 is input, 1 is output
+        var d_modes: c_long = 0xFF_FF;
+        // bitmask. D0 to D15 (LSB is D0). 0 is output low, 1 is output high
+        var d_outputs: c_long = 0;
+        // bitmask. D0 to D15 (LSB is D0). 0 is output low, 1 is output high
+        // the actual pin states read back from the device. an outvar from the API call.
+        var d_states: c_long = 0;
+
+        // bitmask. IO0 to IO3 (LSB is IO0). 0 is input, 1 is output
+        const io_modes: c_long = 0b1111;
+        // bitmask. IO0 to IO3 (LSB is IO0). 0 is output low, 1 is output high
+        var io_outputs: c_long = 0;
+
+        const status = c_api.DigitalIO(
+            &id,
+            self.demo(),
+            &d_modes,
+            io_modes,
+            &d_outputs,
+            &io_outputs,
+            1, // actually update the pin modes
+            &d_states,
+        );
+
+        if (!status.okay())
+            return status.toError();
+    }
+
     /// Read one analog input channel, either single-ended or differential
     pub fn analogReadOne(self: Labjack, input: AnalogInput) LabjackError!AnalogReadResult {
         if (!input.channel.isDifferential() and input.gain_index != 0) {
@@ -48,7 +79,7 @@ pub const Labjack = struct {
 
         const status = c_api.EAnalogIn(
             &id,
-            @intFromBool(self.demo),
+            self.demo(),
             input.channelNumber(),
             input.gainIndex(),
             &over_v,
@@ -67,7 +98,7 @@ pub const Labjack = struct {
         var id = self.cId();
         const status = c_api.EDigitalOut(
             &id,
-            @intFromBool(self.demo),
+            self.demo(),
             output.channelNumber(),
             @intFromBool(output.isDLine()),
             @intFromBool(output.level),
@@ -100,7 +131,7 @@ pub const Labjack = struct {
 
         const status = c_api.AISample(
             &id,
-            @intFromBool(self.demo),
+            self.demo(),
             &out_states,
             @intFromBool(outputs != null),
             @intFromBool(ledOn),
@@ -129,6 +160,10 @@ pub const Labjack = struct {
     fn cId(self: Labjack) c_long {
         return self.id orelse -1;
     }
+
+    fn demo(self: Labjack) c_long {
+        return @intFromBool(self.demobit);
+    }
 };
 
 pub const AnalogInput = struct {