{"id":3709,"date":"2019-02-12T16:09:39","date_gmt":"2019-02-12T16:09:39","guid":{"rendered":"https:\/\/cyflexdoc.wpengine.com\/usage-help-manual\/17-i-o-systems\/gmodbus\/"},"modified":"2025-09-26T12:01:31","modified_gmt":"2025-09-26T17:01:31","slug":"gmodbus","status":"publish","type":"page","link":"https:\/\/cyflex.com\/index.php\/usage-help-manual\/14-i-o-systems\/gmodbus\/","title":{"rendered":"gmodbus"},"content":{"rendered":"
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Purpose:<\/h3>\n<\/div>\n
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Use a CyFlex variable interface to and from multiple Modbus RTU\/TCP compliant slaves.<\/p>\n<\/dd>\n<\/dl>\n

Enter:<\/h3>\n
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gmodbus<\/strong> <priority> <specification_filename> [max_varibles_per_modbus_transfer] [check_rate] [verbose] &<\/p>\n<\/dd>\n<\/dl>\n

Where:<\/h3>\n
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\n\n\n\n<\/colgroup>\n\n\n\n\n\n\n
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priority<\/p>\n<\/td>\n

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Specify the task priority.<\/p>\n<\/td>\n<\/tr>\n

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specification_filename<\/p>\n<\/td>\n

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Specify the gmodbus specification file name.<\/p>\n<\/td>\n<\/tr>\n

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max_varibles_per_modbus_transfer<\/p>\n<\/td>\n

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Optional. Specify the limit of the maximum number of variables to transfer in a single modbus request. The default is to group as many variables as possible in a request.<\/p>\n<\/td>\n<\/tr>\n

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check_rate<\/p>\n<\/td>\n

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Optional. Specify the rate (in milliseconds) to test for timely updates. The default value is 2000ms.<\/p>\n<\/td>\n<\/tr>\n

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verbose<\/p>\n<\/td>\n

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Optional. Add some status <\/span>messages to the error_log. Example error includes a message that the device is performing faster or slower than anticipated.<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/dd>\n<\/dl>\n

Example:<\/h3>\n
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gmodbus<\/strong> 19 \/specs\/gModbus_specs.101 &<\/p>\n<\/dd>\n<\/dl>\n

Notes:<\/h3>\n
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To turn off runtime (not init) error logging set GMODBUS_ERRLOG environment variable before starting GModBus:<\/p>\n

export GMODBUS_ERRLOG=0<\/p>\n<\/dd>\n<\/dl>\n

See Also:<\/h3>\n
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GModBus Setup<\/a>, modbus_srvr_serial<\/a>, modbus_srvr_tcp<\/a>, GModBus Specs Example<\/a><\/p>\n<\/dd>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"

Purpose: Use a CyFlex variable interface to and from multiple Modbus RTU\/TCP compliant slaves. Enter: gmodbus <priority> <specification_filename> [max_varibles_per_modbus_transfer] [check_rate] [verbose] & Where: priority Specify the task priority. specification_filename Specify the gmodbus specification file name. max_varibles_per_modbus_transfer Optional. Specify the limit of the maximum number of variables to transfer in a single modbus request. The default […]<\/p>\n","protected":false},"author":47,"featured_media":0,"parent":1964,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-3709","page","type-page","status-publish","hentry"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/3709","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/users\/47"}],"replies":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/comments?post=3709"}],"version-history":[{"count":0,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/3709\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/pages\/1964"}],"wp:attachment":[{"href":"https:\/\/cyflex.com\/index.php\/wp-json\/wp\/v2\/media?parent=3709"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}