diff --git a/ChangeLog b/ChangeLog
index 7f5bfa93..317ec0f5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -16661,3 +16661,5 @@
 2018-06-20 Fred Gleason <fredg@paravelsystems.com>
 	* Added a 'TranscodingDelay=' parameter to the '[Tuning]' section
 	of rd.conf(5).
+2018-06-21 Fred Gleason <fredg@paravelsystems.com>
+	* Added support for the Broadcast Tools SS 2.1 switcher.
diff --git a/docs/opsguide/gpio_switcher_devices.xml b/docs/opsguide/gpio_switcher_devices.xml
index a71b83da..8a7041e4 100644
--- a/docs/opsguide/gpio_switcher_devices.xml
+++ b/docs/opsguide/gpio_switcher_devices.xml
@@ -467,6 +467,40 @@
     </para>
   </sect1>
 
+  <sect1 xml:id="sect.gpio_switcher_devices.btss21">
+    <title>BroadcastTools SS 2.1</title>
+    <variablelist>
+      <varlistentry>
+	<term>Driver Name:</term>
+	<listitem>
+	  <para>
+	    BroadcastTools SS 2.1
+	  </para>
+	</listitem>
+      </varlistentry>
+      <varlistentry>
+	<term>Supported RML Commands:</term>
+	<listitem>
+	  <para>
+	    <simplelist>
+	      <member>Switch Take ['<command>ST</command>']</member>
+	    </simplelist>
+	  </para>
+	</listitem>
+      </varlistentry>
+    </variablelist>
+    <para>
+      Control is done by means of an RS-232C connection to a four pin RJ11
+      modular jack on the back of the unit (an adapter to a standard DB9
+      connector is supplied by Broadcast Tools with the unit).  Serial port
+      parameters should be set to 9600 baud rate, no parity, 8 data bits, 1
+      stop bit, CR/LF termination.
+    </para>
+    <para>
+      Operation in 'multidrop' mode is not supported.
+    </para>
+  </sect1>
+
   <sect1 xml:id="sect.gpio_switcher_devices.btss164">
     <title>BroadcastTools SS 16.4</title>
     <variablelist>
diff --git a/lib/rdmatrix.cpp b/lib/rdmatrix.cpp
index 61943747..c532fa35 100644
--- a/lib/rdmatrix.cpp
+++ b/lib/rdmatrix.cpp
@@ -2,7 +2,7 @@
 //
 // Abstract a Rivendell Switcher Matrix
 //
-//   (C) Copyright 2002-2016 Fred Gleason <fredg@paravelsystems.com>
+//   (C) Copyright 2002-2018 Fred Gleason <fredg@paravelsystems.com>
 //
 //   This program is free software; you can redistribute it and/or modify
 //   it under the terms of the GNU General Public License version 2 as
@@ -71,7 +71,8 @@ bool __mx_primary_controls[RDMatrix::LastType][RDMatrix::LastControl]=
     {0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,1,1,0,0,0,0,0,0,0,0,0},  // Kernel GPIO
     {0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0},  // WheatNet SLIO
     {0,0,1,1,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0},  // WheatNet LIO
-    {0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0}   // BT Universale 4.1 MLR>>Web
+    {0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0},  // BT Universale 4.1 MLR>>Web
+    {0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,0,0}   // BT SS 2.1
   };
 bool __mx_backup_controls[RDMatrix::LastType][RDMatrix::LastControl]=
   {
@@ -119,7 +120,8 @@ bool __mx_backup_controls[RDMatrix::LastType][RDMatrix::LastControl]=
     {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},  // Kernel GPIO
     {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},  // WheatNet SLIO
     {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},  // WheatNet LIO
-    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}   // BT Universal 4.1 MLR>>Web
+    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},  // BT Universal 4.1 MLR>>Web
+    {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}   // BT SS 2.1
   };
 
 int __mx_default_values[RDMatrix::LastType][RDMatrix::LastControl]=
@@ -168,7 +170,8 @@ int __mx_default_values[RDMatrix::LastType][RDMatrix::LastControl]=
     {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0},  // Kernel GPIO
     {1,0,0,55776,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0},  // WheatNet SLIO
     {1,0,0,55776,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0},  // WheatNet LIO
-    {1,0,0,56,0,0,0,0,0,0,0,4,1,5,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0}   // BT Universal 4.1 MLR>>Web
+    {1,0,0,56,0,0,0,0,0,0,0,4,1,5,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0},  // BT Universal 4.1 MLR>>Web
+    {0,0,0,0,0,0,0,0,0,0,0,2,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0}   // BT SS 2.1
   };
 
 RDMatrix::RDMatrix(const QString &station,int matrix)
@@ -652,6 +655,10 @@ QString RDMatrix::typeString(RDMatrix::Type type)
 	return QString("Logitek vGuest");
 	break;
 
+      case RDMatrix::BtSs21:
+	return QString("BroadcastTools SS2.1");
+	break;
+
       case RDMatrix::BtSs164:
 	return QString("BroadcastTools SS16.4");
 	break;
diff --git a/lib/rdmatrix.h b/lib/rdmatrix.h
index 3641d2dd..7d317899 100644
--- a/lib/rdmatrix.h
+++ b/lib/rdmatrix.h
@@ -2,7 +2,7 @@
 //
 // Abstract a Rivendell Switcher Matrix
 //
-//   (C) Copyright 2002-2017 Fred Gleason <fredg@paravelsystems.com>
+//   (C) Copyright 2002-2018 Fred Gleason <fredg@paravelsystems.com>
 //
 //   This program is free software; you can redistribute it and/or modify
 //   it under the terms of the GNU General Public License version 2 as
@@ -39,7 +39,7 @@ class RDMatrix
 	     LiveWireLwrpGpio=29,BtSentinel4Web=30,BtGpi16=31,ModemLines=32,
 	     SoftwareAuthority=33,Sas16000=34,RossNkScp=35,BtAdms4422=36,
 	     BtSs41Mlr=37,Modbus=38,KernelGpio=39,WheatnetSlio=40,
-	     WheatnetLio=41,BtU41MlrWeb=42,LastType=43};
+	     WheatnetLio=41,BtU41MlrWeb=42,BtSs21=43,LastType=44};
   enum Endpoint {Input=0,Output=1};
   enum Mode {Stereo=0,Left=1,Right=2};
   enum VguestAttribute {VguestEngine=0,VguestDevice=1,VguestSurface=2,
diff --git a/ripcd/Makefile.am b/ripcd/Makefile.am
index 0353209d..db843ad0 100644
--- a/ripcd/Makefile.am
+++ b/ripcd/Makefile.am
@@ -42,6 +42,7 @@ dist_ripcd_SOURCES = acu1p.cpp acu1p.h\
                      btgpi16.cpp btgpi16.h\
                      btsentinel4web.cpp btsentinel4web.h\
                      btss124.cpp btss124.h\
+                     btss21.cpp btss21.h\
                      btss164.cpp btss164.h\
                      btss41mlr.cpp btss41mlr.h\
                      btss42.cpp btss42.h\
@@ -95,6 +96,7 @@ nodist_ripcd_SOURCES = moc_am16.cpp\
                        moc_btsrc8iii.cpp\
                        moc_btss124.cpp\
                        moc_btss164.cpp\
+                       moc_btss21.cpp\
                        moc_btss41mlr.cpp\
                        moc_btss42.cpp\
                        moc_btss44.cpp\
diff --git a/ripcd/btss21.cpp b/ripcd/btss21.cpp
new file mode 100644
index 00000000..4952f279
--- /dev/null
+++ b/ripcd/btss21.cpp
@@ -0,0 +1,122 @@
+// btss21.cpp
+//
+// A Rivendell switcher driver for the BroadcastTools SS 2.1
+//
+//   (C) Copyright 2002-2018 Fred Gleason <fredg@paravelsystems.com>
+//
+//   This program is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License version 2 as
+//   published by the Free Software Foundation.
+//
+//   This program is distributed in the hope that it will be useful,
+//   but WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//   GNU General Public License for more details.
+//
+//   You should have received a copy of the GNU General Public
+//   License along with this program; if not, write to the Free Software
+//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#include <qstringlist.h>
+#include <qtimer.h>
+
+#include <stdlib.h>
+
+#include <globals.h>
+#include <btss21.h>
+
+
+BtSs21::BtSs21(RDMatrix *matrix,QObject *parent)
+  : Switcher(matrix,parent)
+{
+  //
+  // Get Matrix Parameters
+  //
+  bt_matrix=matrix->matrix();
+  bt_inputs=matrix->inputs();
+  bt_outputs=matrix->outputs();
+
+  //
+  // Initialize the TTY Port
+  //
+  RDTty *tty=new RDTty(rdstation->name(),matrix->port(RDMatrix::Primary));
+  bt_device=new RDTTYDevice();
+  if(tty->active()) {
+    bt_device->setName(tty->port());
+    bt_device->setSpeed(tty->baudRate());
+    bt_device->setWordLength(tty->dataBits());
+    bt_device->setParity(tty->parity());
+    bt_device->open(IO_Raw|IO_ReadWrite);
+  }
+  delete tty;
+}
+
+
+BtSs21::~BtSs21()
+{
+  delete bt_device;
+}
+
+
+RDMatrix::Type BtSs21::type()
+{
+  return RDMatrix::BtSs21;
+}
+
+
+unsigned BtSs21::gpiQuantity()
+{
+  return 0;
+}
+
+
+unsigned BtSs21::gpoQuantity()
+{
+  return 0;
+}
+
+
+bool BtSs21::primaryTtyActive()
+{
+  return true;
+}
+
+
+bool BtSs21::secondaryTtyActive()
+{
+  return false;
+}
+
+
+void BtSs21::processCommand(RDMacro *cmd)
+{
+  QString str;
+
+  switch(cmd->command()) {
+  case RDMacro::ST:
+    if((cmd->arg(1).toInt()<0)||(cmd->arg(1).toInt()>bt_inputs)||
+       (cmd->arg(2).toInt()<1)||(cmd->arg(2).toInt()>1)) {
+      cmd->acknowledge(false);
+      emit rmlEcho(cmd);
+      return;
+    }
+    if(cmd->arg(1).toInt()==0) {
+      str=QString().sprintf("*%dM",BTSS21_UNIT_ID);
+      bt_device->writeBlock(str,str.length());
+    }
+    else {
+      str=QString().sprintf("*%d%d",BTSS21_UNIT_ID,
+			    cmd->arg(1).toInt());
+      bt_device->writeBlock(str,str.length());
+    }
+    cmd->acknowledge(true);
+    emit rmlEcho(cmd);
+    break;
+
+  default:
+    cmd->acknowledge(false);
+    emit rmlEcho(cmd);
+    break;
+  }
+}
diff --git a/ripcd/btss21.h b/ripcd/btss21.h
new file mode 100644
index 00000000..3ef22b1f
--- /dev/null
+++ b/ripcd/btss21.h
@@ -0,0 +1,55 @@
+// btss21.h
+//
+// A Rivendell switcher driver for the BroadcastTools SS 2.1
+//
+//   (C) Copyright 2002-2018 Fred Gleason <fredg@paravelsystems.com>
+//
+//   This program is free software; you can redistribute it and/or modify
+//   it under the terms of the GNU General Public License version 2 as
+//   published by the Free Software Foundation.
+//
+//   This program is distributed in the hope that it will be useful,
+//   but WITHOUT ANY WARRANTY; without even the implied warranty of
+//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//   GNU General Public License for more details.
+//
+//   You should have received a copy of the GNU General Public
+//   License along with this program; if not, write to the Free Software
+//   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//
+
+#ifndef BTSS21_H
+#define BTSS21_H
+
+#include <rd.h>
+#include <rdmatrix.h>
+#include <rdmacro.h>
+#include <rdtty.h>
+#include <rdoneshot.h>
+
+#include <switcher.h>
+
+#define BTSS21_UNIT_ID 0
+
+class BtSs21 : public Switcher
+{
+ Q_OBJECT
+ public:
+  BtSs21(RDMatrix *matrix,QObject *parent=0);
+  ~BtSs21();
+  RDMatrix::Type type();
+  unsigned gpiQuantity();
+  unsigned gpoQuantity();
+  bool primaryTtyActive();
+  bool secondaryTtyActive();
+  void processCommand(RDMacro *cmd);
+
+ private:
+  RDTTYDevice *bt_device;
+  int bt_matrix;
+  int bt_inputs;
+  int bt_outputs;
+};
+
+
+#endif  // BTSS21_H
diff --git a/ripcd/loaddrivers.cpp b/ripcd/loaddrivers.cpp
index 084da9f2..642ce41e 100644
--- a/ripcd/loaddrivers.cpp
+++ b/ripcd/loaddrivers.cpp
@@ -37,6 +37,7 @@
 #include <btsrc8iii.h>
 #include <btss124.h>
 #include <btss164.h>
+#include <btss21.h>
 #include <btss41mlr.h>
 #include <btss42.h>
 #include <btss44.h>
@@ -126,6 +127,10 @@ bool MainObject::LoadSwitchDriver(int matrix_num)
     ripcd_switcher[matrix_num]=new BtSs164(matrix,this);
     break;
 
+  case RDMatrix::BtSs21:
+    ripcd_switcher[matrix_num]=new BtSs21(matrix,this);
+    break;
+
   case RDMatrix::BtSs41Mlr:
     ripcd_switcher[matrix_num]=new BtSs41Mlr(matrix,this);
     break;