diff --git a/libticables/trunk/po/de.po b/libticables/trunk/po/de.po
index c02883fbb..2bcd0d185 100644
--- a/libticables/trunk/po/de.po
+++ b/libticables/trunk/po/de.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: libticables2 1.3.6\n"
 "Report-Msgid-Bugs-To: tilp-users@lists.sourceforge.net\n"
-"POT-Creation-Date: 2019-10-12 18:05+0200\n"
+"POT-Creation-Date: 2021-07-10 17:40+0200\n"
 "PO-Revision-Date: 2019-10-29 13:55+0100\n"
 "Last-Translator: Andreas B. Mundt <andi@debian.org>\n"
 "Language-Team: <debian-l10n-german@lists.debian.org>\n"
@@ -105,7 +105,7 @@ msgstr "    TTY-Unterstützung: verfügbar."
 msgid "Check for tty usability:"
 msgstr "Prüfe TTY-Verfügbarkeit:"
 
-#: src/bsd/detect.cc:277 src/linux/detect.cc:346 src/linux/detect.cc:386
+#: src/bsd/detect.cc:277 src/linux/detect.cc:339 src/linux/detect.cc:386
 msgid "    is usable: yes"
 msgstr "    benutzbar: ja"
 
@@ -445,9 +445,17 @@ msgstr "kann serielles Gerät '%s' nicht nutzen"
 msgid "Error running TIOCGSERIAL ioctl on device %s - %s"
 msgstr "Fehler TIOCGSERIAL-Ioctl auf Gerät %s - %s auszuführen"
 
-#: src/linux/detect.cc:341 src/linux/detect.cc:381
-msgid "    is usable: no"
-msgstr "    ist benutzbar: nein"
+#: src/linux/detect.cc:335 src/linux/detect.cc:343
+msgid ""
+"NOTE: proceeding nevertheless, in an attempt to help usage of libticables "
+"with some USB/RS232 adapters, though most do not work at all for the "
+"purposes of TI's protocol"
+msgstr ""
+
+#: src/linux/detect.cc:342
+#, c-format
+msgid "Serial port has unknown type %d"
+msgstr ""
 
 #: src/linux/detect.cc:357
 msgid "Check for parport support:"
@@ -465,6 +473,10 @@ msgstr "    parport-Unterstützung: nicht kompiliert."
 msgid "Check for parport usability:"
 msgstr "Prüfe parport-Verfügbarkeit:"
 
+#: src/linux/detect.cc:381
+msgid "    is usable: no"
+msgstr "    ist benutzbar: nein"
+
 #: src/linux/detect.cc:412
 msgid "Check for libusb usability:"
 msgstr "Prüfe Verfügbarkeit von libusb:"
diff --git a/libticables/trunk/po/fr.po b/libticables/trunk/po/fr.po
index 6ea65ee53..33d322880 100644
--- a/libticables/trunk/po/fr.po
+++ b/libticables/trunk/po/fr.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: libticables2 1.3.6\n"
 "Report-Msgid-Bugs-To: tilp-users@lists.sourceforge.net\n"
-"POT-Creation-Date: 2019-10-12 18:05+0200\n"
+"POT-Creation-Date: 2021-07-10 17:40+0200\n"
 "PO-Revision-Date: 2011-12-13 19:16+0100\n"
 "Last-Translator: Lionel Debroux <lionel_debroux@yahoo.fr>\n"
 "Language-Team: Français <tilp-users@list.sf.net>\n"
@@ -108,7 +108,7 @@ msgstr "    support tty: disponible."
 msgid "Check for tty usability:"
 msgstr "Vérification de l'utilisabilité du tty:"
 
-#: src/bsd/detect.cc:277 src/linux/detect.cc:346 src/linux/detect.cc:386
+#: src/bsd/detect.cc:277 src/linux/detect.cc:339 src/linux/detect.cc:386
 msgid "    is usable: yes"
 msgstr "    est utilisable: oui"
 
@@ -445,9 +445,20 @@ msgid "Error running TIOCGSERIAL ioctl on device %s - %s"
 msgstr ""
 "Erreur lors de l'exécution de l'ioctl TIOCGSERIAL sur le périphérique %s - %s"
 
-#: src/linux/detect.cc:341 src/linux/detect.cc:381
-msgid "    is usable: no"
-msgstr "    est utilisable: non"
+#: src/linux/detect.cc:335 src/linux/detect.cc:343
+msgid ""
+"NOTE: proceeding nevertheless, in an attempt to help usage of libticables "
+"with some USB/RS232 adapters, though most do not work at all for the "
+"purposes of TI's protocol"
+msgstr ""
+"NOTE: on poursuit quand même, pour tenter d'aider à l'utilisation de "
+"libticables avec certains adaptateurs USB/RS232, bien que la plupart ne "
+"fonctionnent pas du tout pour l'utilisation du protocole de TI"
+
+#: src/linux/detect.cc:342
+#, c-format
+msgid "Serial port has unknown type %d"
+msgstr "Le port série a le type inconnu %d"
 
 #: src/linux/detect.cc:357
 msgid "Check for parport support:"
@@ -465,6 +476,10 @@ msgstr "    support parport: pas compilé."
 msgid "Check for parport usability:"
 msgstr "Vérification de l'utilisabilité du port parallèle:"
 
+#: src/linux/detect.cc:381
+msgid "    is usable: no"
+msgstr "    est utilisable: non"
+
 #: src/linux/detect.cc:412
 msgid "Check for libusb usability:"
 msgstr "Vérification de l'utilisabilité de libusb:"
diff --git a/libticables/trunk/po/libticables2.pot b/libticables/trunk/po/libticables2.pot
index 94bd66e28..f8168ccf3 100644
--- a/libticables/trunk/po/libticables2.pot
+++ b/libticables/trunk/po/libticables2.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: libticables2 1.3.6\n"
 "Report-Msgid-Bugs-To: tilp-users@lists.sourceforge.net\n"
-"POT-Creation-Date: 2019-10-12 18:05+0200\n"
+"POT-Creation-Date: 2021-07-10 17:40+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -103,7 +103,7 @@ msgstr ""
 msgid "Check for tty usability:"
 msgstr ""
 
-#: src/bsd/detect.cc:277 src/linux/detect.cc:346 src/linux/detect.cc:386
+#: src/bsd/detect.cc:277 src/linux/detect.cc:339 src/linux/detect.cc:386
 msgid "    is usable: yes"
 msgstr ""
 
@@ -394,8 +394,16 @@ msgstr ""
 msgid "Error running TIOCGSERIAL ioctl on device %s - %s"
 msgstr ""
 
-#: src/linux/detect.cc:341 src/linux/detect.cc:381
-msgid "    is usable: no"
+#: src/linux/detect.cc:335 src/linux/detect.cc:343
+msgid ""
+"NOTE: proceeding nevertheless, in an attempt to help usage of libticables "
+"with some USB/RS232 adapters, though most do not work at all for the "
+"purposes of TI's protocol"
+msgstr ""
+
+#: src/linux/detect.cc:342
+#, c-format
+msgid "Serial port has unknown type %d"
 msgstr ""
 
 #: src/linux/detect.cc:357
@@ -414,6 +422,10 @@ msgstr ""
 msgid "Check for parport usability:"
 msgstr ""
 
+#: src/linux/detect.cc:381
+msgid "    is usable: no"
+msgstr ""
+
 #: src/linux/detect.cc:412
 msgid "Check for libusb usability:"
 msgstr ""
diff --git a/libticables/trunk/src/linux/detect.cc b/libticables/trunk/src/linux/detect.cc
index 57deb0edf..f08eaa6f1 100644
--- a/libticables/trunk/src/linux/detect.cc
+++ b/libticables/trunk/src/linux/detect.cc
@@ -332,18 +332,18 @@ int linux_check_tty(const char *devname)
     if (ioctl(fd, TIOCGSERIAL, &serinfo) < 0)
     {
         ticables_warning(_("Error running TIOCGSERIAL ioctl on device %s - %s"), devname, strerror(errno));
-        close(fd);
-        return ERR_TTDEV;
+        ticables_warning("%s", _("NOTE: proceeding nevertheless, in an attempt to help usage of libticables with some USB/RS232 adapters, though most do not work at all for the purposes of TI's protocol"));
     }
-
-    if(serinfo.type == PORT_UNKNOWN || serinfo.type == PORT_MAX)
+    else
     {
-        ticables_info("%s", _("    is usable: no"));
-        close(fd);
-        return ERR_TTDEV;
+        ticables_info("%s", _("    is usable: yes"));
+        if (serinfo.type == PORT_UNKNOWN || serinfo.type == PORT_MAX)
+        {
+            ticables_warning(_("Serial port has unknown type %d"), serinfo.type);
+            ticables_warning("%s", _("NOTE: proceeding nevertheless, in an attempt to help usage of libticables with some USB/RS232 adapters, though most do not work at all for the purposes of TI's protocol"));
+        }
     }
 
-    ticables_info("%s", _("    is usable: yes"));
     close(fd);
 #endif