Version 6.4
| A memory resident real-time database that acts as a hub, providing fast and efficient concentration and distribution of data for QNX and Linux applications. |
| Cogent software is source-code compatible among the Linux, QNX 6, and QNX 4 operating systems. |
| Go to the Cogent Web Site. |
Table of Contents
1. Introduction
2. Using the Cascade DataHub
3. Data Transmission
A. GNU General Public License- B. GNU Lesser General Public License
I. Utilities- datahub - starts the Cascade DataHub.
- dhview - a console-based viewer for the Cascade DataHub.dhview
- phdhview - a Photon-based viewer for the Cascade DataHub.
- readpt - reads a point from the Cascade DataHub.
- waiter - registers for exceptions with a Cascade DataHub and displays values as updates are received.
- writept - writes a point to the Cascade DataHub.
- xdhview - an X Windows-based viewer for the Cascade DataHub.
II. Cascade DataHub Command Set- acksuccess - tells the DataHub to return success messages.
- add - adds a value to a point.
- alias - creates an alias point for an existing point.
- alive - tells the Cascade DataHub that the client is running.
- append - appends a string to the value of a point.
- assembly - creates an assembly.
- asyncsocket - sets up asynchronous communication on a socket.
- attribute - creates an attribute.
- auth - requests authentication for a client.
- authgroup - creates a new authentication group.
- authuser - creates a new user.
- auto_create_domains - automatically adds domains requested by clients.
- auto_timestamp - adds timestamps to unstamped changes.
- bridge - creates a bridge between two points.
- bridge_remove - deletes a bridge.
- bridge_transform - modifies an existing bridge.
- cforce - creates a point and forces a value to be written to it.
- cread - creates and reads a point.
- create - creates a new point.
- create_domain - creates a new domain.
- creport - creates a point and requests notification of changes.
- cset - creates a point and assigns it a value.
- cwrite - creates a point and writes information to it.
- debug - sets the debug level.
- defaultprop - sets a default type for a property.
- delete - deletes a point—use with caution.
- deleted - checks if a point has been deleted.
- div - does division on the value of a point.
- domain - identifies the client domain name.
- domains - lists all domains in the DataHub.
- dump - writes the entire content of the DataHub to a file.
- enable_bridging - enables or disables bridging capabilities
- enable_dde_client - enables or disables DDE client capabilities.
- enable_dde_server - enables or disables DDE server capabilities.
- enable_mirror_master - enables or disables mirror master capabilities.
- enable_mirror_slave - enables or disables mirror slave capabilities.
- enable_scripting - enables or disables scripting capabilities
- enable_tcp_server - enables or disables TCP server capabilities.
- error - sends an error with an error string.
- exit - shuts down the DataHub.
- flush - flushes output to a terminal (Linux).
- flush_log - forces an immediate update of the Script Log (Windows).
- force - forces a write to a point.
- format - is an efficiency enhancement for Linux.
- heartbeat - establishes a heartbeat message.
- ignore - ignores a given point.
- ignore_old_data - ignores changes with an old timestamp.
- include - includes a file in with configuration files.
- instance - creates an instance of a data organization model.
- load_config_files - loads configuration files.
- load_plugin - loads a specified plugin. (experimental)
- load_scripts - loads scripts.
- lock - locks and unlocks points.
- log_file - sets up a log file.
- log_to_file - starts or stops logging to a file.
- mirror_master - sets up a mirroring master.
- mirror_master_2 - sets up a secure mirroring master.
- mult - multiplies the value of a point.
- private_attribute - creates a private attribute.
- property - creates a property for an assembly.
- quality - assigns a quality to a point.
- read - reads a complete point definition.
- report - requests notification of changes to a data point.
- report_domain - registers points and requests information on a whole domain.
- report_errors - controls the reporting of errors.
- request_initial_data - gets current data when client connection is made.
- save_config - forces the DataHub to save its configuration.
- secure - adjusts the security level of a point.
- set - sets the value of a point.
- set_canonical - sets the type of a point.
- subassembly - creates a subassembly.
- success - sets up a success message.
- tcp_service - sets a TCP service name or port number for incoming slave connections.
- timeout - suspends data flow.
- transmit_insignificant - permits transmission of insignificant changes.
- type - creates a type.
- unload_plugin - unloads a plugin. (experimental)
- unreport - allows a client to stop receiving data value changes to a point.
- version - returns the current version number.
- write - writes information to a point.
III. Obsolete and Unused Commands- bandwidth_reduce - is for internal use only.
- drop_license - is for internal use only.
- echo - is for internal use.
- enable_connect_server - is deprecated.
- EnableDDEServer - is for internal use only.
- exception_buffer - is deprecated.
- failed_license - is for internal use only.
- master_host - is deprecated in favor of mirror_master.
- master_service - is deprecated in favor of mirror_master.
- on_change - is for internal use only.
- point - is used internally.
- qnx_name_attach - does nothing.
- qnx_receiver - does nothing.
- readid - should not be used.
- register_datahub - replaced by report_domain.
- report_all - replaced by report_domain.
- report_datahubs - does nothing.
- request - replaced by report_domain.
- run - does nothing.
- script_register - is for internal use only.
- script_symbol - is for internal use only.
- slave - is for internal use only.
- sync - is for internal use only.
- taskdied - is for internal use.
- taskstarted - is for internal use.
- using_license - is for internal use only.
- warn_of_license_expiry - is deprecated.
- Index
List of Figures
List of Tables
- 2.1. Memory Usage
