diff --git a/tcl/phytron.tcl b/tcl/phytron.tcl
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+#------------------------------------------------------------------
+# This is driver for the combination Phytron MCC-2 Motor Controller 
+# and SICS using the scriptcontext asynchronous I/O system. The 
+# MCC-2 has a funny protocl as that messages are enclosed into 
+# <STX>  data <ETX> sequences. This protocol is handled by the 
+# C-language phytron protocol handler. Per default, the MCC-2 is 
+# configured to use 57600 baud. I have configured it to use 9600
+# baud and it ought to remember this. The command to change this 
+# 0IC1S9600, the command to read this is 0IC1R. 
+#
+# There are surely many ways to use the MCC-2. It supports two axes, X and Y. 
+# All examples below are given for X only. This driver uses it in
+# this way: 
+# 
+# Nothing works properly without a reference run. The reference run is done 
+# in  the following way:
+# 1) Send it into the negative limit switch with 0X0-   
+# 2) Set the mechanical position with 0XP20Swert to the negative limit
+# 3) Set the encoder position with 0XP22Swert to the negative limit
+#
+# Position ever afterwards with 0XAwert, read encoder with 0XP22R
+#
+# While driving 0X=H return ACKN, else ACKE
+#
+# Stopping goes via 0XSN
+#
+# copyright: see file COPYRIGHT
+#
+# Script chains:
+#
+# - reading position:
+#    readpos - posrcv
+#
+# - writing postion:
+#    setpos - setrcv
+#
+#  reading status:
+#     sendstatus - rcvstatus - statpos
+#
+# Mark Koennecke, June 2009
+#-------------------------------------------------------------------------
+
+namespace eval phytron {}
+
+#-----------------------------------------------------------------------
+proc phytron::check {} {
+    set data [sct result]
+    if {[string first AscErr $data] >= 0} {
+	error $data
+    }
+    return $data
+}
+#------------------------------------------------------------------------
+proc phytron::readpos {axis} {
+    sct send "0${axis}P22R"
+    return posrcv
+}
+#------------------------------------------------------------------------
+proc phytron::posrcv {} {
+    set data [phytron::check]
+    set pos [string range $data 3 end]
+    sct update $pos
+    return idle
+}
+#------------------------------------------------------------------------
+proc phytron::setpos {axis name} {
+    set val [sct target]
+    sct send "0${axis}A$val"
+    hupdate /sics/${name}/status run
+    return setrcv
+}
+#------------------------------------------------------------------------
+proc phytron::setrcv {controller name} {
+    set data [phytron::check]
+    if {[string first NACK $data] >= 0} {
+	error "Invalid command"
+    }
+    $controller queue /sics/${name}/status progress read
+    return idle
+}
+#-------------------------------------------------------------------------
+proc phytron::sendstatus {axis} {
+    sct send "0${axis}=H"
+    return rcvstatus
+}
+#-------------------------------------------------------------------------
+proc phytron::rcvstatus {axis controller} {
+    set status [catch {phytron::check} data]
+    if {$status != 0} {
+	sct update error
+	clientput $error
+    }
+    if {[string first ACKN $data] >= 0} {
+	sct update run
+	$controller queue [sct] progress read
+    }
+    if {[string first ACKE $data] >= 0} {
+	phytron::readpos $axis
+	return posrcv
+    }
+    return idle
+}
+#-------------------------------------------------------------------------
+proc phytron::statpos {axis name} {
+    set data [phytron::check]
+    set pos [string range $data 3 end]
+    hupdate /sics/${name}/hardposition $pos
+    sct send "0${axis}=I+"
+    return statposlim
+}
+#------------------------------------------------------------------------
+proc phytron::statposlim {axis} {
+    set data [phytron::check]
+    if {[string first ACKE $data] >= 0} {
+	sct update error
+	clientput "Hit positive limit switch"
+        return idle
+    }
+    sct send "0${axis}=I-"
+    return statneglim
+}
+#------------------------------------------------------------------------
+proc phytron::statneglim {axis} {
+    set data [phytron::check]
+    if {[string first ACKE $data] >= 0} {
+	sct update error
+	clientput "Hit negative limit switch"
+        return idle
+    }
+    sct send "0${axis}=E"
+    return statend
+}
+#------------------------------------------------------------------------
+proc phytron::statend {axis} {
+    set data [phytron::check]
+    if {[string first ACKE $data] >= 0} {
+	sct update error
+	clientput "Electronics error"
+        return idle
+    }
+    sct update idle
+    return idle
+}
+#-------------------------------------------------------------------------
+proc phytron::halt {controller axis} {
+    $controller send "0${axis}SN"
+    return Done
+}
+#--------------------------------------------------------------------------
+proc phytron::refrun {name controller axis lowlim} {
+    set path /sics/${name}/status
+    $controller send "0${axis}0-"
+    hupdate $path run
+    set motstat run
+    wait 3
+    while {[string compare $motstat run] == 0} {
+	$controller queue $path progress read
+	wait 1
+	set motstat [string trim [hval $path]]
+    }
+    $controller transact "0${axis}P20S$lowlim"
+    $controller transact "0${axis}P22S$lowlim"
+    return Done
+}
+#-------------------------------------------------------------------------
+proc phytron::defpos {controller axis value} {
+    $controller transact "0${axis}P20S$value"
+    $controller transact "0${axis}P22S$value"
+    return Done
+}
+#--------------------------------------------------------------------------
+proc phytron::make {name axis controller lowlim upperlim} {
+    MakeSecMotor $name
+
+    hdel /sics/${name}/hardupperlim
+    hdel /sics/${name}/hardlowerlim
+    hfactory /sics/${name}/hardupperlim plain internal float
+    hfactory /sics/${name}/hardlowerlim plain internal float
+    $name hardlowerlim $lowlim
+    $name softlowerlim $lowlim
+    $name hardupperlim $upperlim
+    $name softupperlim $upperlim
+ 
+    hsetprop /sics/${name}/hardposition read phytron::readpos $axis
+    hsetprop /sics/${name}/hardposition posrcv phytron::posrcv 
+    $controller poll /sics/${name}/hardposition 60
+
+    hsetprop /sics/${name}/hardposition write phytron::setpos $axis $name
+    hsetprop /sics/${name}/hardposition setrcv phytron::setrcv $controller $name
+    $controller write /sics/${name}/hardposition
+    
+    hsetprop /sics/${name}/status read phytron::sendstatus $axis
+    hsetprop /sics/${name}/status rcvstatus phytron::rcvstatus $axis $controller
+    hsetprop /sics/${name}/status posrcv  phytron::statpos $axis $name
+    hsetprop /sics/${name}/status statposlim  phytron::statposlim $axis 
+    hsetprop /sics/${name}/status statneglim  phytron::statneglim $axis 
+    hsetprop /sics/${name}/status statend  phytron::statend $axis 
+    $controller poll /sics/${name}/status 60
+
+    $name makescriptfunc halt "phytron::halt $controller $axis" user
+
+    $name makescriptfunc refrun "phytron::refrun $name $controller $axis $lowlim" user
+
+    $name makescriptfunc setpos "phytron::defpos $controller $axis" user
+    hfactory /sics/${name}/setpos/value plain user float
+
+    hupdate /sics/{$name}/status idle
+    $controller queue /sics/${name}/hardposition progress read
+}