{"id":51602,"date":"2026-08-04T21:03:32","date_gmt":"2026-08-04T13:03:32","guid":{"rendered":"https:\/\/www.modbus.cn\/51602.html"},"modified":"2026-08-04T21:03:32","modified_gmt":"2026-08-04T13:03:32","slug":"visualhmi-usb-hid-%e6%89%ab%e7%a0%81%e6%9e%aa%ef%bc%9aon_key-%e6%89%ab%e6%8f%8f%e7%a0%81%e8%bd%ac-ascii","status":"publish","type":"post","link":"http:\/\/www.modbus.cn\/en\/51602.html","title":{"rendered":"VisualHMI USB HID \u626b\u7801\u67aa\uff1aon_key \u626b\u63cf\u7801\u8f6c ASCII"},"content":{"rendered":"

USB Host + \u5b9a\u5236\u56fa\u4ef6\uff0c\u76f4\u63a5\u63a5 HID \u6761\u7801\u626b\u63cf\u67aa\uff0c\u626b\u7801\u5185\u5bb9\u7ecf on_key(key) \u56de\u8c03\u8fdb Lua\u3002\u5de5\u4e1a\u4ed3\u50a8\u3001\u4ea7\u7ebf\u8ffd\u6eaf\u7528\u5f97\u7740\u3002HMI&M&DX \u7cfb\u5217 + USB \u63a5\u53e3 + \u5b9a\u5236\u56fa\u4ef6\u3002<\/p>\n

1. API\uff1aon_key(key)<\/h2>\n

key \u4e3a 16 \u4f4d\u65e0\u7b26\u53f7\u6574\u6570\uff1a\u4f4e 8 \u4f4d = USB HID Usage ID\uff08\u626b\u63cf\u7801\uff09\uff0c\u9ad8 8 \u4f4d = Shift \u72b6\u6001\uff08\u975e 0 \u8868\u793a Shift \u6309\u4e0b\uff0c\u533a\u5206\u5927\u5c0f\u5199\uff09\u3002\u4f4e 8 \u4f4d == 0x28\uff08Enter\uff09\u8868\u793a\u6761\u7801\u7ed3\u675f<\/strong>\uff0c\u6b64\u65f6\u63d0\u4ea4\u5b57\u7b26\u4e32\u5e76\u6e05\u7a7a\u7f13\u51b2\u3002<\/p>\n

2. Lua\uff1aHID \u626b\u63cf\u7801\u8f6c ASCII<\/h2>\n

\u7528\u67e5\u8868\u628a Usage ID \u6620\u5c04\u6210\u5b57\u7b26\uff08\u542b Shift \u5927\u5199\u6001\uff09\uff0c\u9047\u5230 0x28 \u7ed3\u675f\u7b26\u5199 LW2000\uff1a<\/p>\n

_barCode = \"\"\nusbScanGun = {\n  [0x04] = {\"a\",\"A\"}, [0x05] = {\"b\",\"B\"}, ... [0x1D] = {\"z\",\"Z\"},\n  [0x1E] = {\"1\",\"!\"}, [0x1F] = {\"2\",\"@\"}, ... [0x27] = {\"0\",\")\"},\n  [0x2C] = {\" \",\" \"}, [0x28] = {\"n\",\"n\"}  -- Enter\n}\nfunction on_key(key)\n  local usage = key & 0xFF\n  local shift = (key >> 8) & 0xFF\n  if usage == 0x28 then        -- \u7ed3\u675f\u7b26\n    set_string(VT_LW, 0x2000, _barCode)\n    _barCode = \"\"\n    return\n  end\n  local ch = usbScanGun[usage]\n  if ch then\n    _barCode = _barCode .. (shift ~= 0 and ch[2] or ch[1])\n  end\nend<\/pre>\n
<\/p>\n
\u626b\u7801\u67aa\u672c\u8d28\u662f\u952e\u76d8\u6a21\u62df<\/strong>\uff1aHID \u4e0a\u62a5\u7684\u662f\u626b\u63cf\u7801\u4e0d\u662f ASCII\uff0c\u5f97\u81ea\u5df1\u67e5\u8868\u8f6c\u3002Shift \u72b6\u6001\u5728 key \u9ad8 8 \u4f4d\uff0c\u5927\u5c0f\u5199\u9760\u5b83\u533a\u5206\u30020x28 \u662f\u56de\u8f66\u7ed3\u675f\u7b26\u2014\u2014\u6536\u5230\u5c31\u63d0\u4ea4\uff0c\u522b\u7b49\u8d85\u65f6\u3002\u5b9a\u5236\u56fa\u4ef6\u4e13\u5c5e\u3002<\/div>\n
\u6574\u7406\u81ea \u5e7f\u5dde\u5927\u5f69\u79d1\u6280 VisualHMI \u5f00\u53d1\u6587\u6863\uff08hmi-doc.gz-dc.com\uff09\u5176\u4ed6\u6280\u672f\u6559\u7a0b\u300cUSB HID\u626b\u7801\u67aa\u300d\uff0c\u7248\u6743\u5f52\u5927\u5f69\u79d1\u6280\u6240\u6709\u3002<\/p>\n<\/span>","protected":false},"excerpt":{"rendered":"
USB Host + \u5b9a\u5236\u56fa\u4ef6\uff0c\u76f4\u63a5\u63a5 HID \u6761\u7801\u626b\u63cf\u67aa\uff0c…<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[3126,3132],"tags":[3427,3429,3428,3134,3355,3426],"class_list":["post-51602","post","type-post","status-publish","format-standard","hentry","category-hmi-dev","category-hmi-other","tag-on_key","tag-usage-id","tag-usb-hid","tag-visualhmi","tag-3355","tag-3426"],"_links":{"self":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/51602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/comments?post=51602"}],"version-history":[{"count":0,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/posts\/51602\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/media?parent=51602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/categories?post=51602"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.modbus.cn\/en\/wp-json\/wp\/v2\/tags?post=51602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}