diff --git a/UsbSerialLibrary/src/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java b/UsbSerialLibrary/src/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java
index c7bb3f6..34fa14a 100644
--- a/UsbSerialLibrary/src/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java
+++ b/UsbSerialLibrary/src/com/hoho/android/usbserial/driver/CdcAcmSerialDriver.java
@@ -142,9 +142,9 @@ public class CdcAcmSerialDriver extends CommonUsbSerialDriver {
     public void setParameters(int baudRate, int dataBits, int stopBits, int parity) {
         byte stopBitsByte;
         switch (stopBits) {
-            case STOPBITS_1: stopBitsByte = 1; break;
-            case STOPBITS_1_5: stopBitsByte = 2; break;
-            case STOPBITS_2: stopBitsByte = 3; break;
+            case STOPBITS_1: stopBitsByte = 0; break;
+            case STOPBITS_1_5: stopBitsByte = 1; break;
+            case STOPBITS_2: stopBitsByte = 2; break;
             default: throw new IllegalArgumentException("Bad value for stopBits: " + stopBits);
         }