diff --git a/mount_tnc/raspberry/astro_resources.tcl b/mount_tnc/raspberry/astro_resources.tcl
new file mode 100644
index 0000000..5220032
--- /dev/null
+++ b/mount_tnc/raspberry/astro_resources.tcl
@@ -0,0 +1,124 @@
+# source C:/d/rapido/rapido2/actions_incitatives_2019/orientalmotor/test3.tcl
+
+# source C:/d/rapido/rapido2/actions_incitatives_2019/orientalmotor/test3.tcl
+# set f [az_open]
+# set cmd ":e1"
+# puts -nonewline $f "${cmd}\r"
+# flush $f
+
+# ====================================
+# === Tools : Open/close communication
+# ====================================
+
+proc az_close { } {
+   global audace
+   if {[info exists audace(orientalmotor,fid)]==0} {
+      error "Communication not previously opened"
+   }
+   set f $audace(orientalmotor,fid)
+   close $f
+   unset audace(orientalmotor,fid)
+}
+
+proc az_open { {port //./COM6} } {
+   global audace
+   if {[info exists audace(orientalmotor,fid)]==1} {
+      error "Port $port ever opened"
+   }
+   set err [catch {
+      set f [open $port w+]
+      fconfigure $f -mode 115200,n,8,1 -buffering none -blocking 0
+      after 2000
+   } msg]
+   if {$err==1} {
+      error $msg
+   }
+   set audace(orientalmotor,fid) $f
+   az_delay 200
+   return $f
+}
+
+proc az_open_if_needed { } {
+   global audace
+   if {[info exists audace(orientalmotor,fid)]==0} {
+      az_open
+   }
+}
+
+# ====================================
+# === Tools : Put/Get messages
+# ====================================
+
+proc az_delay { {delay ""} } {
+   global audace
+   if {$delay==""} {
+      set delay $audace(orientalmotor,delay)
+   } else {
+      set audace(orientalmotor,delay) $delay
+   }
+   after $delay
+}
+
+proc az_put { cmd } {
+   global audace
+   az_open_if_needed
+   set f $audace(orientalmotor,fid)
+   puts -nonewline $f "${cmd}\r"
+   flush $f
+   az_delay
+}
+
+proc az_read { } {
+   global audace
+   az_open_if_needed
+   set f $audace(orientalmotor,fid)
+   set result ""
+   set t0 [clock milliseconds]
+   set sortie 0
+   while {$sortie==0} {
+      set res [read -nonewline $f]
+      if {$res==""} {
+         set sortie 1
+         break
+      }
+      append result $res
+      set dt [expr [clock milliseconds]-$t0]
+      if {$dt>1000} {
+         set sortie 2
+         break
+      }
+      after 100
+   }
+   return $result
+}
+
+proc az_putread { cmd } {
+   global audace
+   az_read
+   az_put $cmd
+   set res [az_read]
+   #return $res
+   # --- search for the echo of the command name
+   set k [string last ${cmd} $res]
+   if {$k<0} {
+      error "No response"
+   }
+   set res [string range $res $k end]
+   # --- search for the = symbol to isolate the value
+   set k [string first = $res]
+   if {$k>=0} {
+      set res [string range $res [expr 1+$k] end]
+      # --- take only the first element of the response as value
+      set res [split $res \n]
+      set value [lindex $res 0]
+   } else {
+      # --- take only the second element of the response as value
+      set res [split $res \n]
+      set value [lindex $res 1]
+   }
+   return $value
+}
+
+# ====================================
+# === Tools : high level functions
+# ====================================
--
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