{"id":1984,"date":"2018-04-25T08:30:48","date_gmt":"2018-04-25T12:30:48","guid":{"rendered":"http:\/\/ninecrows.com\/career\/?p=1984"},"modified":"2018-04-25T08:30:48","modified_gmt":"2018-04-25T12:30:48","slug":"more-fun-with-rs232-c","status":"publish","type":"post","link":"https:\/\/ninecrows.com\/career\/2018\/04\/25\/more-fun-with-rs232-c\/","title":{"rendered":"More fun with RS232-C"},"content":{"rendered":"

\"\"<\/a>I need to do some RS232-C communications from a java program. My initial investigations suggest that java support for serial port connections is at best rudimentary and that the dedicated solutions are mostly old and poorly maintained.<\/p>\n

I odn’t need all that much sophistication from the solution so I may be able to get away with treating ‘\.\\COM10’ as a file type device and simply streaming bytes to and from it. I’m currently putting together a setup here at home that will help to play with the alternatives.<\/p>\n

I bought a null modem adapter on the way home at a local computer shop (I was mildly surprised they still stocked them, but they had a broad selection of RS232 adapters).<\/p>\n

Turned out that the pin 2\/3 swap wasn’t the issue after all though.<\/p>\n

<\/p>\n

I’m using some old multi-port hardware I have lying around and the four port adapter that I’ve got plugged into my ubuntu linux machine labels its ports 1->4 but they map ttyUSB3->ttyUSB0 in linux. Once I played musical serial ports it became clear that was the problem and I could move forward.<\/p>\n

Since I need two sides to the interaction, I started spinning together a simple non-blocking responder in C++ on the linux side. Once that is done I can experiment with java based solutions driven from the windows side.<\/p>\n

Looks like tonight I may be at the point where I can try some more interesting communications than two copies of putty shoving keyboard characters at each other. If all goes well I may try plugging my serial adapter into one of my raspberry pi controllers as well to see if it will be recognized and run there…that would make for a very nice test target.<\/p>\n","protected":false},"excerpt":{"rendered":"

I need to do some RS232-C communications from a java program. My initial investigations suggest that java support for serial port connections is at best rudimentary and that the dedicated solutions are mostly old and poorly maintained. I odn’t need all that much sophistication from the solution so I may be able to get away … Continue reading More fun with RS232-C<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"More fun with RS232-C","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-1984","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p7F2Qc-w0","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/posts\/1984"}],"collection":[{"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/comments?post=1984"}],"version-history":[{"count":1,"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/posts\/1984\/revisions"}],"predecessor-version":[{"id":1987,"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/posts\/1984\/revisions\/1987"}],"wp:attachment":[{"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/media?parent=1984"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/categories?post=1984"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ninecrows.com\/career\/wp-json\/wp\/v2\/tags?post=1984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}