{"id":38212,"date":"2024-02-12T19:01:01","date_gmt":"2024-02-12T19:01:01","guid":{"rendered":"https:\/\/www.alicat.com\/?post_type=article&#038;p=38212"},"modified":"2026-02-03T20:53:16","modified_gmt":"2026-02-03T20:53:16","slug":"tutorial-zur-seriellen-kommunikation","status":"publish","type":"support","link":"https:\/\/www.alicat.com\/de\/support\/serial-communication-tutorial\/","title":{"rendered":"Tutorial zur seriellen Kommunikation"},"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;4.23.1&#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;4.23.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_heading title=&#8221;Serial communication 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;4.25.1&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]<p>Most Alicat instruments equipped with RS-232 or RS-485 serial <a href=\"https:\/\/www.alicat.com\/support\/communication-options-for-alicat-instruments\/\" target=\"_blank\" rel=\"noopener\">communications<\/a> can be communicated with via ASCII commands. The tabs below cover the basics of Alicat\u2019s serial data frame and serial commands. For more details, download the complete <a href=\"https:\/\/documents.alicat.com\/Alicat-Serial-Primer.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Serial Communications Primer<\/a>.<\/p>\n<p>Note: You can download Alicat\u2019s <a href=\"https:\/\/www.alicat.com\/documentation\/software-drivers\/\" target=\"_blank\" rel=\"noopener noreferrer\">Serial Terminal Application<\/a> for command line access to your instruments. This can also be done using a 3rd-party application like <a href=\"https:\/\/www.alicat.com\/support\/configuring-putty-for-use-with-alicat-instruments\/\" target=\"_blank\" rel=\"noopener noreferrer\">PuTTY<\/a>.<\/p>\n<p>If you are having any problems, check <a href=\"https:\/\/www.alicat.com\/support\/troubleshooting-an-alicat-device\/\" target=\"_blank\" rel=\"noopener\">troubleshooting power and communications<\/a> or <a href=\"https:\/\/www.alicat.com\/contact\/\">contact us<\/a>.<\/p>\n<h2><strong>Video tutorial<\/strong><\/h2>\n<p><iframe title=\"Alicat Mass Flow Instruments: Tutorial - Serial Communication\" width=\"1080\" height=\"608\" src=\"https:\/\/www.youtube.com\/embed\/sLaUxEmOlj0?feature=oembed&rel=0\"  allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>[\/et_pb_text][et_pb_accordion _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_accordion_item title=&#8221;Alicat Serial Commands&#8221; open=&#8221;on&#8221; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;]Note: Serial commands are not case-sensitive. For simplicity, we assume that the unit ID of the flow controller is <strong>A<\/strong> in the listings that follow. <strong>&lt;CR&gt;<\/strong> indicates an ASCII carriage return (decimal 13, hexadecimal D).\n<h2>How to collect data in polling mode<\/h2>\n<ul>\n\t<li><span style=\"color: #000000;\">Change the unit ID:\u00a0<strong>A@=<\/strong>[desired unit ID]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Poll the data frame:\u00a0<strong>A&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Query the data frame format:<strong>\u00a0A??D*&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Query the manufacturer info:\u00a0<strong>A??M*&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Query the current firmware version:\u00a0<strong>AVE&lt;CR&gt;<\/strong><\/span><\/li>\n<\/ul>\n<h2>How to collect data in streaming mode<\/h2>\n<ul>\n\t<li><span style=\"color: #000000;\">Begin streaming data:<strong>\u00a0A@=@&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Stop streaming data:\u00a0<strong>@@=<\/strong>[desired unit ID]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Set streaming interval:\u00a0<strong>AW91=<\/strong>[number of milliseconds]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n<\/ul>\n<h2>How to command a new setpoint (controllers only)<\/h2>\n<ul>\n\t<li><span style=\"color: #000000;\">Command new setpoint:\u00a0<strong>as<\/strong>[floating point number]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n<\/ul>\n<h2>How to tare your instrument<\/h2>\n<ul>\n\t<li><span style=\"color: #000000;\">Tare the flow rate (flow instruments only):\u00a0<strong>AV&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Tare the gauge pressure (pressure instruments only):\u00a0<strong>AP&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Tare absolute pressure with the barometer (when installed):\u00a0<strong>APC&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Reset the flow totalizer (when installed):\u00a0<strong>AT&lt;CR&gt;<\/strong><\/span><\/li>\n<\/ul>\n<h2>How to change the gas selection (flow instruments only)<\/h2>\n<ul>\n\t<li><span style=\"color: #000000;\">Query the list of installed gas calibrations:\u00a0<strong>A??G*&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Select a different gas:\u00a0<strong>AG<\/strong>[Gas Number]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Create a new <a href=\"https:\/\/www.alicat.com\/support\/gas-select-composer-gas-mix-calibration\/\">COMPOSER gas mix<\/a>:\u00a0<strong>AGM<\/strong>\u00a0[Mix Name] [Mix Number] [Gas1 %] [Gas1 Number] [Gas2 %] [Gas2 Number]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Delete a COMPOSER gas mix:\u00a0<strong>AGD<\/strong>\u00a0[Mix Number]<strong>&lt;CR&gt;<\/strong><\/span><\/li>\n<\/ul>\n<h2>Miscellaneous functions<\/h2>\n<ul>\n\t<li><span style=\"color: #000000;\">Hold valve(s) at current position:\u00a0<strong>AHP&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Hold valve(s) closed:\u00a0<strong>AHC&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Exhaust the controller (for dual-valve controllers only: inlet valve closes, exhaust valve opens):\u00a0<strong>AE&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Cancel valve hold:\u00a0<strong>AC&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Lock the front display:\u00a0<strong>AL&lt;CR&gt;<\/strong><\/span><\/li>\n\t<li><span style=\"color: #000000;\">Unlock the front display:\u00a0<strong>AU&lt;CR&gt;<\/strong><\/span><\/li>\n<\/ul>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Alphabetical List of Commands&#8221; _builder_version=&#8221;4.27.0&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; open=&#8221;off&#8221;]Note: Serial commands are not case-sensitive. For simplicity, we assume that the unit ID of the flow controller is <strong>A<\/strong> in the listings that follow. <strong>&lt;CR&gt;<\/strong> indicates an ASCII carriage return (decimal 13, hexadecimal D).\n<ul>\n\t<li><span style=\"color: #000000;\"><strong>A&lt;CR&gt;<\/strong>\u00a0(poll\u00a0the data frame)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AC&lt;CR&gt;<\/strong>\u00a0(cancel valve hold)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AE&lt;CR&gt;<\/strong>\u00a0(exhaust for dual-valve controllers: inlet valve closes, exhaust valve opens)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AG<\/strong>[Gas Number]<strong>&lt;CR&gt;<\/strong>\u00a0(select a different gas)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AGD\u00a0<\/strong>[Gas Number]<strong>&lt;CR&gt;<\/strong>\u00a0(delete a COMPOSER gas mix)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AGM<\/strong>\u00a0[Mix Name] [Mix Number] [Gas1 %] [Gas1 Number] [Gas2 %] [Gas2 Number]<strong>&lt;CR&gt;<\/strong>\u00a0(create a new <a href=\"https:\/\/www.alicat.com\/support\/gas-select-composer-gas-mix-calibration\/\">COMPOSER gas mix<\/a>)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AHC&lt;CR&gt;<\/strong>\u00a0(hold the valves closed)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AHP&lt;CR&gt;<\/strong>\u00a0(hold the valves at their current positions)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AL&lt;CR&gt;<\/strong>\u00a0(lock the front display)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AP&lt;CR&gt;<\/strong>\u00a0(tare the gauge pressure)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>APC&lt;CR&gt;<\/strong>\u00a0(tare the absolute pressure with the barometer, if installed)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AS<\/strong>[floating point number]<strong>&lt;CR&gt;<\/strong>\u00a0(command new setpoint)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AT&lt;CR&gt;<\/strong>\u00a0(reset the totalizer, if installed)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AU&lt;CR&gt;<\/strong>\u00a0(unlock the front display)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AV&lt;CR&gt;<\/strong>\u00a0(tare the flow rate)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>AVE&lt;CR&gt;<\/strong>\u00a0(query\u00a0the current firmware version)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>A<\/strong><strong>W91=<\/strong>[number of milliseconds] (set streaming interval)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>A??D*&lt;CR&gt;<\/strong>\u00a0(query the data frame format)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>A??G*&lt;CR&gt;<\/strong>\u00a0(query the list of installed gas calibrations)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>A??M*&lt;CR&gt;<\/strong>\u00a0(query the manufacturer info)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>A@=<\/strong>[desired unit ID]<strong>&lt;CR&gt;<\/strong>\u00a0(change the unit ID)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>A@=@&lt;CR&gt;<\/strong>\u00a0(begin streaming data)<\/span><\/li>\n\t<li><span style=\"color: #000000;\"><strong>@@=<\/strong>[desired unit ID]<strong>&lt;CR&gt;<\/strong>\u00a0(stop streaming data)<\/span><\/li>\n<\/ul>[\/et_pb_accordion_item][et_pb_accordion_item title=&#8221;Serial Data Frame&#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; open=&#8221;off&#8221;]<h2>Standard serial data frame<\/h2>\n<p>The following is an example of a typical data frame for a 500 SCCM mass flow controller with optional totalizer:<\/p>\n<p><strong>A +087.6 +025.0 +164.7 +981.6 +985.0 +022741.4 Air HLD MOV TMF<\/strong><\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>A<\/strong>\u00a0= device ID (A-Z)<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>+087.6<\/strong>\u00a0= absolute pressure<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>+025.0<\/strong>\u00a0= temperature<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>+164.7<\/strong>\u00a0= volumetric flow rate<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>+981.6<\/strong>\u00a0= mass flow rate<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>+985.0<\/strong>\u00a0= setpoint<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>+022741.4<\/strong>\u00a0= totalized flow since last reset<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>Air\u00a0<\/strong>= selected gas<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>HLD<\/strong>\u00a0= status code (valve hold)<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>MOV<\/b>= status code (mass flow rate overflow)<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>TMF\u00a0<\/b>= status code (flow totalizer missed out of range flow)<\/span><\/li>\n<\/ul>\n<h2>Status codes<\/h2>\n<p>The following status codes appear both in the serial data frame and on the instrument display:<\/p>\n<ul>\n<li><span style=\"color: #000000;\"><strong>ADC<\/strong>\u00a0= analog-digital converter error<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>EXH<\/strong>\u00a0= valve exhaust is active (dual-valve controllers only)<\/span><\/li>\n<li><span style=\"color: #000000;\"><strong>HLD<\/strong>\u00a0= valve hold is active<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>LCK\u00a0<\/b>= front display is locked<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>MOV<\/b>= mass flow rate is over the measurable range of the device<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>OPL\u00a0<\/b>= overpressure limit has been exceeded (option)<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>OVR<\/b>= flow totalizer rolled over to zero (option)<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>POV<\/b>= pressure is over the measurable range of the device<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>TMF\u00a0<\/b>= flow totalizer missed out of range flow (option)<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>TOV<\/b>= temperature is over the measurable range of the device<\/span><\/li>\n<li><span style=\"color: #000000;\"><b>VOV<\/b>= volumetric flow rate is over the measurable range of the device<\/span><\/li>\n<\/ul>[\/et_pb_accordion_item][\/et_pb_accordion][\/et_pb_column][\/et_pb_row][\/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-38212","support","type-support","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Serial Communication Tutorial - Alicat Scientific<\/title>\n<meta name=\"description\" content=\"Most Alicat instruments equipped with RS-232 or RS-485 serial communications can be communicated with via ASCII commands. 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