{"id":37995,"date":"2024-03-26T16:38:37","date_gmt":"2024-03-26T16:38:37","guid":{"rendered":"https:\/\/www.alicat.com\/?post_type=article&#038;p=37995"},"modified":"2026-01-28T15:59:48","modified_gmt":"2026-01-28T15:59:48","slug":"alarmfunktion-ale-befehl-tutorial","status":"publish","type":"support","link":"https:\/\/www.alicat.com\/de\/support\/alarm-function-ale-command-tutorial\/","title":{"rendered":"Alarmfunktion (ALE-Befehl) Tutorial"},"content":{"rendered":"\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; custom_padding=&#8221;||0px||false|false&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_heading title=&#8221;Alarm function (ALE command) tutorial&#8221; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_heading][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_css_free_form=&#8221;selector h2 {||  margin-top: 1rem;||}&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p>Alicat <a href=\"https:\/\/www.alicat.com\/products\/gas-flow\/\" target=\"_blank\" rel=\"noopener\">flow<\/a> and <a href=\"https:\/\/www.alicat.com\/products\/pressure\/\" target=\"_blank\" rel=\"noopener\">pressure<\/a> devices have an optional <a href=\"https:\/\/www.alicat.com\/support\/totalizers-batch-dispensing-alarms\/\" target=\"_blank\" rel=\"noopener\">alarm<\/a> functionality that helps simplify control systems such as PLCs or manned stations. An alarm is transmitted as an analog signal though the communications connector on the device.<\/p>\n<ul>\n<li><span style=\"color: #000000;\">In systems where an Alicat is not connected to a central system, the alarm pin can be wired to a simple bulb and used to indicate\u00a0a deviation from the flow or pressure setpoint.<\/span><\/li>\n<li><span style=\"color: #000000;\">When connected to a PLC, the alarm output can be set to trigger different stages of a controlled process or notify a central system when the process falls outside of tolerances.<\/span><\/li>\n<\/ul>\n<p>The alarm is preconfigured at the factory, and the ALE serial command can be used to change the alarm settings in the field. The following article gives a brief introduction to the ALE serial command and provides a breakdown of the command structure for setting an alarm.<\/p>\n<p><strong><a href=\"https:\/\/www.alicat.com\/service-request\/\" target=\"_blank\" rel=\"noopener\">Don\u2019t have the alarm function? Request one from our service center<\/a><\/strong><\/p>\n<h2>The ALE serial command format<\/h2>\n<p>Before setting an alarm, it is important to determine the parameters you want to work with and how you want the alarm to behave.<\/p>[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;1rem||1rem||true|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_accordion_item title=&#8221;Alarm expression format&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<div class=\"su-box su-box-style-default\" id=\"\">\n<div class=\"su-box-content su-u-clearfix su-u-trim\">\n<p><em>deviceID<\/em>\u00a0<strong>ALE<\/strong>\u00a0<em>Alarm#<\/em>\u00a0<em>SetExpression<\/em>\u00a0<em>ClearExpression<\/em><\/p>\n<\/div>\n<\/div>\n<ul><\/ul>[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_text _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<ul>\n<li><span style=\"color: #000000;\">The\u00a0<strong><em>deviceID<\/em><\/strong>\u00a0is the standard ASCII A-Z unit ID each device is assigned. This is \u2018A\u2019 by default.<\/span><\/li>\n<li><span style=\"color: #000000;\">The\u00a0<strong><em>SetExpression<\/em><\/strong>\u00a0is the full expression for when the alarm should trigger.<\/span><\/li>\n<li><span style=\"color: #000000;\">The\u00a0<em><strong>ClearExpression<\/strong><\/em>\u00a0is the full expression for when the alarm should stop. This is written such that the alarm will stop when the clear expression is false.<\/span><\/li>\n<\/ul>[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_accordion_item title=&#8221;SetExpression and ClearExpression format&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<div class=\"su-box su-box-style-default\" id=\"\">\n<div class=\"su-box-content su-u-clearfix su-u-trim\">\n<p><em>sValue:UnitscValueOperator<\/em><\/p>\n<\/div>\n<\/div>[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_padding=&#8221;||2px|||&#8221; custom_css_free_form=&#8221;selector h2 {||  margin-top: 1rem;||}&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p style=\"text-align: left;\">The <strong><em>SetExpression <\/em><\/strong>and <em><strong>ClearExpression<\/strong><\/em> are both formatted using Reverse Polish Notation.<\/p>\n<ul style=\"text-align: left;\">\n<li><span style=\"color: #000000;\"><em>s<\/em>\u00a0indicates that the following\u00a0<em>Value<\/em>\u00a0is in reference to a \u201cstatistic\u201d or parameter value of the device<\/span><\/li>\n<li><span style=\"color: #000000;\"><em>c<\/em>\u00a0indicates that the following\u00a0<em>Value<\/em>\u00a0is a constant<\/span><\/li>\n<li><span style=\"color: #000000;\"><em>Units<\/em>\u00a0indicates the engineering units selected for the statistic<\/span><\/li>\n<li><span style=\"color: #000000;\"><em>Operator<\/em>\u00a0specifies the alarm trigger<\/span><\/li>\n<\/ul>\n<h2 style=\"text-align: left;\">Using the alarm command (basic steps)<\/h2>\n<h3 style=\"text-align: left;\">1. Connect your device and open the serial terminal app<\/h3>\n<p style=\"text-align: left;\">Plug the device in and connect the communication cable to your PC, then open the serial terminal app.<\/p>\n<p style=\"text-align: left;\">If you don\u2019t already have a serial terminal application, download Alicat\u2019s pre-configured application here:\u00a0<a href=\"https:\/\/www.alicat.com\/documentation\/software-drivers\/\" rel=\"noopener noreferrer\">\/documentation\/software-drivers\/<\/a>.<\/p>\n<h3 style=\"text-align: left;\">2. Decide which of the two alarms to set<\/h3>\n<ul style=\"text-align: left;\">\n<li><span style=\"color: #000000;\">0 = first alarm<\/span><\/li>\n<li><span style=\"color: #000000;\">1 = second alarm<\/span><\/li>\n<\/ul>\n<h3 style=\"text-align: left;\">3. Determine which value should be compared to for the alarm<\/h3>\n<p style=\"text-align: left;\">Not all parameters are available on all devices. See table below for available parameters.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p style=\"text-align: center;\"><strong>Select Available Parameters<\/strong><\/p>[\/et_pb_text][dvmd_table_maker tbl_top_left_mode=&#8221;on&#8221; tbl_frame_type=&#8221;none&#8221; tbl_stripes_active=&#8221;on&#8221; tbl_tcell_cell_color=&#8221;#FFFFFF&#8221; tbl_chead_cell_color=&#8221;#FFFFFF&#8221; tbl_rhead_cell_color=&#8221;#FFFFFF&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; tbl_chead_text_font=&#8221;|700|||||||&#8221; tbl_chead_text_text_color=&#8221;#000000&#8243; tbl_rhead_text_text_color=&#8221;#000000&#8243; tbl_rfoot_text_text_color=&#8221;#000000&#8243; max_width=&#8221;50%&#8221; max_width_tablet=&#8221;100%&#8221; max_width_phone=&#8221;100%&#8221; max_width_last_edited=&#8221;on|tablet&#8221; module_alignment=&#8221;center&#8221; hover_enabled=&#8221;0&#8243; border_width_all=&#8221;1px&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][dvmd_table_maker_item col_content=&#8221;Statistic Parameter\nAbsolute Pressure\nTemperature\nVolumetric Flow\nMass Flow\nGauge Pressure (if available)\nValve Drive\nBarometric Pressure&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][\/dvmd_table_maker_item][dvmd_table_maker_item col_content=&#8221;ID Value\n2\n3\n4\n5\n6\n13\n15&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][\/dvmd_table_maker_item][\/dvmd_table_maker][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; custom_padding=&#8221;||0px||false|false&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<h3 style=\"text-align: left;\">4. Determine the engineering units you would like to use for this value<\/h3>\n<p style=\"text-align: left;\">See the table below for available engineering units. If default, skip this step.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; hover_enabled=&#8221;0&#8243; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;]<p style=\"text-align: center;\"><strong>Select Available Engineering Units<\/strong><\/p>[\/et_pb_text][dvmd_table_maker tbl_top_left_mode=&#8221;on&#8221; tbl_frame_type=&#8221;none&#8221; tbl_stripes_active=&#8221;on&#8221; tbl_tcell_cell_color=&#8221;#FFFFFF&#8221; tbl_chead_cell_color=&#8221;#FFFFFF&#8221; tbl_rhead_cell_color=&#8221;#FFFFFF&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; tbl_chead_text_font=&#8221;|700|||||||&#8221; tbl_chead_text_text_color=&#8221;#000000&#8243; tbl_rhead_text_text_color=&#8221;#000000&#8243; tbl_rfoot_text_text_color=&#8221;#000000&#8243; max_width=&#8221;50%&#8221; max_width_tablet=&#8221;100%&#8221; max_width_phone=&#8221;100%&#8221; max_width_last_edited=&#8221;on|tablet&#8221; module_alignment=&#8221;center&#8221; hover_enabled=&#8221;0&#8243; border_width_all=&#8221;1px&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][dvmd_table_maker_item col_content=&#8221;Engineering Unit\nLPM\nSLPM\nNLPM\nCCM\nSCCM\nNCCM\nCFH\nSCFH\nCFM\nSCFM\nPSI\nmbar\nNm3\/h\nNm3\/m\n\u00b0C\n\u00b0F\ntorr\nkPa&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][\/dvmd_table_maker_item][dvmd_table_maker_item col_content=&#8221;ID Value\n7\n7\n37\n12\n12\n42\n19\n19\n18\n18\n10\n6\n45\n44\n2\n3\n13\n4&#8243; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][\/dvmd_table_maker_item][\/dvmd_table_maker][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; custom_padding=&#8221;||0px||false|false&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<h3 style=\"text-align: left;\">5. Determine the operator<\/h3>\n<p style=\"text-align: left;\">Do you want the alarm to trigger when the parameter is greater than, less than, or equal to a specific value? See the available operators table below.<\/p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; custom_margin_last_edited=&#8221;on|desktop&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p style=\"text-align: center;\"><strong>Available Operators<\/strong><\/p>[\/et_pb_text][dvmd_table_maker tbl_top_left_mode=&#8221;on&#8221; tbl_frame_type=&#8221;none&#8221; tbl_stripes_active=&#8221;on&#8221; tbl_tcell_cell_color=&#8221;#FFFFFF&#8221; tbl_chead_cell_color=&#8221;#FFFFFF&#8221; tbl_rhead_cell_color=&#8221;#FFFFFF&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; tbl_chead_text_font=&#8221;|700|||||||&#8221; tbl_chead_text_text_color=&#8221;#000000&#8243; tbl_rhead_text_text_color=&#8221;#000000&#8243; tbl_rfoot_text_text_color=&#8221;#000000&#8243; max_width=&#8221;50%&#8221; max_width_tablet=&#8221;100%&#8221; max_width_phone=&#8221;100%&#8221; max_width_last_edited=&#8221;on|tablet&#8221; module_alignment=&#8221;center&#8221; border_width_all=&#8221;1px&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][dvmd_table_maker_item col_label=&#8221;Operator&#8221; col_content=&#8221;Operator\nEqual to\nNot Equal to\nLess Than\nGreater Than\nLess Than or Equal to\nGreater Than or Equal to&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/dvmd_table_maker_item][dvmd_table_maker_item col_label=&#8221;Symbol&#8221; col_content=&#8221;Symbol\n=\n<>\n<\n>\n<=\n>=&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/dvmd_table_maker_item][\/dvmd_table_maker][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; custom_padding=&#8221;||0px||false|false&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]While using a Boolean is completely optional, it presents more logic options. An expression with a Boolean operator follows a similar format as the <strong><em>SetExpression <\/em><\/strong>and <em><strong>ClearExpression<\/strong>\u00a0<\/em>described above.[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;1rem||1rem||true|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_accordion_item title=&#8221;SetExpression and ClearExpression format with Boolean operator&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; toggle_font=&#8221;|700|||||||&#8221; theme_builder_area=&#8221;post_content&#8221;]<div class=\"su-box su-box-style-default\" id=\"\">\n<div class=\"su-box-content su-u-clearfix su-u-trim\">\n<p><em>sValue:UnitscValueOperatorsValue:UnitscValueOperatorBoolean<\/em><\/p>\n<\/div>\n<\/div>[\/et_pb_accordion_item][\/et_pb_accordion][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]See the valid Boolean operators in the table below.[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p style=\"text-align: center;\"><strong>Available Boolean Operators<\/strong><\/p>[\/et_pb_text][dvmd_table_maker tbl_top_left_mode=&#8221;on&#8221; tbl_frame_type=&#8221;none&#8221; tbl_stripes_active=&#8221;on&#8221; tbl_tcell_cell_color=&#8221;#FFFFFF&#8221; tbl_chead_cell_color=&#8221;#FFFFFF&#8221; tbl_rhead_cell_color=&#8221;#FFFFFF&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; tbl_chead_text_font=&#8221;|700|||||||&#8221; tbl_chead_text_text_color=&#8221;#000000&#8243; tbl_rhead_text_text_color=&#8221;#000000&#8243; tbl_rfoot_text_text_color=&#8221;#000000&#8243; max_width=&#8221;50%&#8221; max_width_tablet=&#8221;100%&#8221; max_width_phone=&#8221;100%&#8221; max_width_last_edited=&#8221;on|tablet&#8221; module_alignment=&#8221;center&#8221; border_width_all=&#8221;1px&#8221; locked=&#8221;off&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][dvmd_table_maker_item col_label=&#8221;Boolean Operator&#8221; col_content=&#8221;Boolean Operator\nBoth True (And)\nEither True (Or)\nOnly One True (Xor)\nNot True&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/dvmd_table_maker_item][dvmd_table_maker_item col_label=&#8221;Symbol&#8221; col_content=&#8221;Symbol\n&#038;\n|\n^\n!&#8221; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/dvmd_table_maker_item][\/dvmd_table_maker][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.24.2&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_text _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; custom_margin=&#8221;||1rem||false|false&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<h3 class=\"su-box-title\">Example alarm expressions:<\/h3>[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; toggle_font=&#8221;|700|||||||&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; sticky_enabled=&#8221;0&#8243;][et_pb_accordion_item title=&#8221;Hidden Item So All Items Are Closed on Page Load&#8221; _builder_version=&#8221;4.27.5&#8243; _module_preset=&#8221;default&#8221; theme_builder_area=&#8221;post_content&#8221; custom_css_free_form=&#8221;selector {||  display: none;||}&#8221; hover_enabled=&#8221;0&#8243; sticky_enabled=&#8221;0&#8243;][\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 1: Set Expression&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p><span><strong>Example 1: Set Expression<\/strong><\/span><\/p>\n<p><strong>s2:10c105.0&gt;<\/strong><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>s2<\/strong>\u00a0indicates that the \u201cstatistic\u201d variable is number 2. The\u00a0<em>Select Available Parameters<\/em>\u00a0table above shows this corresponds to absolute pressure.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>:10<\/strong>\u00a0indicates that the engineering units selected are value 10. From the\u00a0<em>Select Available Engineering Units<\/em>\u00a0table above, this corresponds to PSI.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>c105.0<\/strong>\u00a0indicates that the constant value is 105.0<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>&gt;<\/strong>\u00a0is the operator used<\/span><\/li>\n<\/ul>\n<p>In this case, the alarm will \u201cSET\u201d (trigger or turn on) when the absolute pressure &gt; 105 PSIA.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 2: Clear Expression&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p><strong>s2:10c95.0&gt;=<\/strong><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>s2<\/strong>\u00a0indicates that the \u201cstatistic\u201d variable is number 2. The\u00a0<em>Select Available Parameters<\/em>\u00a0table above shows this corresponds to absolute pressure.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>:10<\/strong>\u00a0indicates that the engineering units selected are value 10. From the\u00a0<em>Select Available Engineering Units<\/em>\u00a0table above, this corresponds to PSI.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>c95.0<\/strong>\u00a0indicates that the constant value is 95.0<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>&gt;=<\/strong>\u00a0is the operator used<\/span><\/li>\n<\/ul>\n<p>In this case, the alarm will \u201cCLEAR\u201d (cancel or turn off) when the pressure IS NOT \u2265 95.0 PSIA.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 3.1: Full Command&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p><strong>A ALE 0 s2:10c105.0&gt; s2:10c95.0&gt;=<\/strong><\/p>\n<ul>\n<li><strong>A<\/strong> indicates that this\u00a0alarm\u00a0should be added to the device with unit ID A<\/li>\n<li><strong>ALE<\/strong>\u00a0is the\u00a0alarm\u00a0set command<\/li>\n<li><strong>0<\/strong> indicates setting the first alarm<\/li>\n<li><strong>s2:10c105.0&gt;<\/strong> is the SetExpression stating that the alarm should trigger (or \u201cSET\u201d) when the pressure &gt; 105.0 PSIA, as in example 1.<\/li>\n<li><strong>s2:10c95.0&gt;=<\/strong> is the ClearExpression stating that the alarm should stop (or \u201cCLEAR\u201d) when the pressure is NOT \u2265 95.0 PSIA.<\/li>\n<\/ul>\n<p>After sending this command, if the pressure increases to the point where it exceeds 105.0 PSIA, the\u00a0alarm\u00a0will trigger and the device will output a voltage or open drain signal (depending on the physical configuration). If the pressure then decreases to 104.0 PSIA, the\u00a0alarm\u00a0will still be on. Until the pressure drops below 95.0 PSIA, the\u00a0alarm\u00a0will still be triggered and the device will output the voltage or open drain signal.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 3.2 Full Command&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p><strong>C ALE 0 s13c95&gt; s13c95&gt;<\/strong><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>C ALE 0<\/strong>\u00a0sets the first\u00a0alarm\u00a0on the device with unit ID C.<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>s13<\/strong>\u00a0indicates the 13th statistic (valve drive) in its default engineering units (%).<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>c95&gt;<\/strong>\u00a0indicates a constant value of 95. The device will trigger if the statistic is greater than this value.<\/span><\/li>\n<\/ul>\n<p>Since the clear expression is identical to the set expression, the device will only trigger when the set expression is true (similar to the old-style alarm). This command will trigger the alarm when the valve drive &gt; 95% and clear when it isn\u2019t.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 4: Command with &#038;&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p>In situations where your system needs to be firmly outside of the set expression conditions, giving the clear expression wider bounds can give an alarm where it will remain active even when just beyond the set expression.<\/p>\n<p><strong>D ALE 1 s2:10c51&gt;s2:10c99&lt;&amp; s2:10c49&gt;s2:10c101&lt;&amp;<\/strong><\/p>\n<ul>\n<li><strong>s2:10c51&gt;s2:10c99&lt;&amp;<\/strong> sets the alarm when absolute pressure &gt; 51 PSIA and &lt; 99 PSIA.<\/li>\n<li><strong>s2:10c49&gt;s2:10c101&lt;&amp;<\/strong>\u00a0clears the\u00a0alarm\u00a0when absolute pressure is outside of the range 49 to 101 PSIA.<\/li>\n<\/ul>\n<p>Together than means that if the pressure increases from 40 to 60 PSIA and decreases again to 40 PSIA, the\u00a0alarm\u00a0will trigger after the pressure exceeds 51 PSIA and clear once it equals 49 PSIA. Similarly if the pressure decreases from 120 to 90 PSIA and increases back to 120 PSIA, it will trigger the\u00a0alarm\u00a0once the pressure drops below 99 PSIA and clear it once the pressure increases to at least 101 PSIA.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 5: Command with |&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p><strong>E ALE 0 s2:10c49&lt;s2:10c101&gt;| s2:10c51&lt;s2:10c99&gt;|<\/strong><\/p>\n<p>This will command the device with unit ID E to set up the first\u00a0alarm\u00a0as follows:<\/p>\n<ul>\n<li><span style=\"color: #000000;\">Trigger when absolute pressure &lt; 49 PSIA OR &gt; 101 PSIA.<\/span><\/li>\n<li><span style=\"color: #000000;\">Clear when absolute pressure is NOT &lt; 51 PSIA OR &gt; 99 PSIA.<\/span><\/li>\n<\/ul>\n<p>This will clear if the value is between or equal to 51-99 PSIA.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 6: Command with ^&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p><strong>F ALE 1 s5:12c5&gt;s6:4c700&gt;^ s5:12c5&gt;s6:4c700&gt;^<\/strong><\/p>\n<p>This will command the device with unit ID F to set up the second\u00a0alarm\u00a0as follows:<\/p>\n<ul>\n<li><span style=\"color: #000000;\">Trigger when mass flow &gt; 5 SCCM OR gauge pressure &gt; 700 kPaG, but not both.<\/span><\/li>\n<li><span style=\"color: #000000;\">Clear when mass flow is NOT &gt; 5 SCCM OR gauge pressure is NOT &gt; 700 kPaG, but not both.<\/span><\/li>\n<\/ul>\n<p>This will clear when either mass flow \u2264 5 SCCM OR when gauge pressure \u2264 700 kPaG.<\/p>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Example 7: Command with !&#8221; _builder_version=&#8221;4.27.4&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]<p><strong>G ALE 0 s2:10c14.8&lt;! 1<\/strong><\/p>\n<p>This will command the device with unit ID G to set up the first\u00a0alarm\u00a0as follows:<\/p>\n<ul>\n<li><span style=\"color: #000000;\">Trigger when absolute pressure is NOT &lt; 14.8 PSIA.<\/span><\/li>\n<li><span style=\"color: #000000;\">Never clear.<\/span><\/li>\n<\/ul>\n<p>This is a good alarm to set if the device is always used at atmospheric pressure. It will trigger an alarm to warn of a potential blown sensor when the device thinks atmospheric pressure is above 14.8 PSIA. The alarm will only be cleared by repowering the device or sending another ALE command to the device.<\/p>[\/et_pb_accordion_item][\/et_pb_accordion][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.23.1&#8243; _module_preset=&#8221;default&#8221; background_color=&#8221;#FFFFFF&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][\/et_pb_section]\n","protected":false},"featured_media":46458,"parent":0,"template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"1920","content-type":"","_searchwp_excluded":""},"categories":[],"class_list":["post-37995","support","type-support","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Alarm Function (ALE Command) Tutorial - Alicat Scientific<\/title>\n<meta name=\"description\" content=\"Alicat flow and pressure devices have an optional alarm functionality that helps simplify control systems such as PLCs or manned stations. An alarm is transmitted as an analog signal though the communications connector on the device. The following article gives a brief introduction to the ALE serial command and provides a breakdown of the command structure for setting an alarm.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alicat.com\/de\/unterstutzung\/alarmfunktion-ale-befehl-tutorial\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Alarm Function (ALE Command) Tutorial\" \/>\n<meta property=\"og:description\" content=\"Alicat flow and pressure devices have an optional alarm functionality that helps simplify control systems such as PLCs or manned stations. An alarm is transmitted as an analog signal though the communications connector on the device. The following article gives a brief introduction to the ALE serial command and provides a breakdown of the command structure for setting an alarm.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.alicat.com\/de\/unterstutzung\/alarmfunktion-ale-befehl-tutorial\/\" \/>\n<meta property=\"og:site_name\" content=\"Alicat Scientific\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/alicatscientific\/\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-28T15:59:48+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.alicat.com\/wp-content\/uploads\/2026\/01\/featured-alicat.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"7\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.alicat.com\\\/support\\\/alarm-function-ale-command-tutorial\\\/\",\"url\":\"https:\\\/\\\/www.alicat.com\\\/support\\\/alarm-function-ale-command-tutorial\\\/\",\"name\":\"Alarm Function (ALE Command) Tutorial - Alicat Scientific\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.alicat.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.alicat.com\\\/support\\\/alarm-function-ale-command-tutorial\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.alicat.com\\\/support\\\/alarm-function-ale-command-tutorial\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.alicat.com\\\/wp-content\\\/uploads\\\/2026\\\/01\\\/featured-alicat.png\",\"datePublished\":\"2024-03-26T16:38:37+00:00\",\"dateModified\":\"2026-01-28T15:59:48+00:00\",\"description\":\"Alicat flow and pressure devices have an optional alarm functionality that helps simplify control systems such as PLCs or manned stations. 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