{"id":877,"date":"2026-03-03T00:07:39","date_gmt":"2026-03-02T22:07:39","guid":{"rendered":"http:\/\/docklight.de\/dl_prb002\/"},"modified":"2026-03-03T00:07:40","modified_gmt":"2026-03-02T22:07:40","slug":"dl_prb002","status":"publish","type":"post","link":"https:\/\/docklight.de\/dl_prb002\/","title":{"rendered":"Docklight does not display any serial data in the communication window(s) \nor just displays strange characters and question marks."},"content":{"rendered":"

Applies to: Docklight (all versions), Article ID: dl_prb002<\/em><\/p>\n

This is probably caused by the communication settings or the cable link between your devices.
\nCheck your communication settings first. Are all settings correct (baud rate, parity settings, data bits, stop bits)? If your communication includes a parity bit, all bytes with wrong parity will displayed as a question mark (“?”) in the ASCII communication window.<\/p>\n

Test the communication link between the device(s) and the PC next – Do you use the right cable? <\/p>\n

If all seems ok, you may also check your PC’s COM ports. <\/p>\n

If you have two COM ports available, connect the two ports using a standard null modem cable and then run two Docklight applications in send\/receive mode, one for each COM port.
\nTry sending a “Send Sequence” from the first Docklight application and receive this sequence with the other Docklight application.<\/p>\n

NOTE: You may choose to replace the ‘parity error’ question mark by any
\nother ASCII character. See the Docklight user manual, COM port settings.<\/p>\n

Docklight User Manual, COM Port Settings<\/a><\/p>\n

<\/a><\/p>\n

<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Applies to: Docklight (all versions), Article ID: dl_prb002 This is probably caused by the communication settings or the cable link between your devices. Check your communication settings first. Are all settings correct (baud rate, parity settings, data bits, stop bits)? If your communication includes a parity bit, all bytes with wrong parity will displayed as a question mark (“?”) in […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,8],"tags":[61],"class_list":["post-877","post","type-post","status-publish","format-standard","hentry","category-support","category-troubleshooting","tag-dl_prb002"],"yoast_head":"\nDocklight - Docklight does not display any serial data in the communication window(s) or just displays strange characters and question marks.<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/docklight.de\/dl_prb002\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Docklight - Docklight does not display any serial data in the communication window(s) or just displays strange characters and question marks.\" \/>\n<meta property=\"og:description\" content=\"Applies to: Docklight (all versions), Article ID: dl_prb002 This is probably caused by the communication settings or the cable link between your devices. Check your communication settings first. Are all settings correct (baud rate, parity settings, data bits, stop bits)? If your communication includes a parity bit, all bytes with wrong parity will displayed as a question mark (“?”) in […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/docklight.de\/dl_prb002\/\" \/>\n<meta property=\"og:site_name\" content=\"Docklight\" \/>\n<meta property=\"article:published_time\" content=\"2026-03-02T22:07:39+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-02T22:07:40+00:00\" \/>\n<meta name=\"author\" content=\"Flachmann & Heggelbacher\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Flachmann & Heggelbacher\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/docklight.de\\\/dl_prb002\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/docklight.de\\\/dl_prb002\\\/\"},\"author\":{\"name\":\"Flachmann & Heggelbacher\",\"@id\":\"https:\\\/\\\/docklight.de\\\/#\\\/schema\\\/person\\\/d6855d60ab4ee87f6482ab881c7151a3\"},\"headline\":\"Docklight does not display any serial data in the communication window(s) or just displays strange characters and question marks.\",\"datePublished\":\"2026-03-02T22:07:39+00:00\",\"dateModified\":\"2026-03-02T22:07:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/docklight.de\\\/dl_prb002\\\/\"},\"wordCount\":197,\"publisher\":{\"@id\":\"https:\\\/\\\/docklight.de\\\/#organization\"},\"keywords\":[\"dl_prb002\"],\"articleSection\":[\"Support\",\"Troubleshooting\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/docklight.de\\\/dl_prb002\\\/\",\"url\":\"https:\\\/\\\/docklight.de\\\/dl_prb002\\\/\",\"name\":\"Docklight - 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