Black Box GEH-6510 manual Glossary of Terms, Terms You Should Know

Glossary of Terms

Terms You Should Know

Application Name – The name of the DDE Server program. This is supplied by the DDE client to establish a DDE conversation with a DDE Server application.

Client – An application requesting data from the DDE Server.

Communication Time-out– The maximum time to wait for a response from a device after Server has requested data from the device. If no response is received within the time-out period, the Server decides that the device will never respond and gives up on the current request for data, responding with a time-out error message. If a device times out repeatedly, the Server declares the device to be dead then occasionally queries the device to see if it has recovered.

DDE – Acronym for Dynamic Data Exchange, a message protocol that allows Windows applications to exchange data with one another.

GE32MODB – Application name for DDE Server, RS-485 Modbus version. GE32MTCP – Application name for DDE Server, Modbus TCP/IP version

GE32EIND – Application name for DDE Server, Electro Industries Serial Protocol version

Generic Device – A user-defined device type that is not pre-configured for support by the PMCS DDE Server. The user must supply the associated register map, communications parameters, function codes, etc. PLCs, due to their highly flexible nature, are included in this device type.

Invalid Register Block – A range of register addresses within a register block that the PMCS DDE Server has been instructed not to scan. These may be addresses unused by the device itself, or simply registers in which the user is not interested.

Item – A name to identify the data in which communicating parties are interested. For the DDE Server, an item is the desired data point.

Mnemonic – Easily remembered name or string of characters representing the item register address, assigned by the user to make using the software easier.

NetDDE – Acronym for Network Dynamic Data Exchange, a message protocol that allows Windows applications to exchange data with one another across a network. With regard to PMCS, it means that the PMCS DDE Server could be located on one machine and be accessed by client software programs on other machines on a network.

Polling – Continuous scheduled acquisition of data. The DDE Server’s scanning of devices to satisfy client’s DDE requests.

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