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Overview, Quick start, Digital i/o: digitaln – Omega Engineering M-4066 User Manual

Page 7: Description, Omwt-soft-opc server and wireless, Wireless setup

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OMWT-SOFT-OPC Server

Overview N 3

Description

OMWT-SOFT-OPC is a data acquisition OLE for Process Control (OPC) server that

acquires data from devices and passes this data using OPC to a client application.

OMWT-SOFT-OPC waits for the device to transmit and then processes the

transmission.

Any Windows® application that can use OPC can obtain this data from the OMWT-

SOFT-OPCServer. Examples of such applications include Wonderware® Intouch,

National Instruments® LookOut, Capital Equipment Corp.® TestPoint, and general

development applications like Microsoft® Visual Basic and Borland® Delphi.
OMWT-SOFT-OPC can be a stand-alone data logger. When data logging is enabled,

OMWT-SOFT-OPC will also store collected data in an ASCII file at a programmable

interval. Another program such as a spreadsheet or a database manager can import

the data. See section "OMWT-SOFT-OPC Server Data Logging".

OMWT-SOFT-OPC Server and Wireless

OMWT-SOFT-OPC Server can receive transmissions from wireless devices such as

the wireless temperature transmitter. Other devices include the wireless humidity

sensor and wireless analog input. OMWT-SOFT-OPC uses a wireless receiver such

as the OMWT-REC232-600, OMWT-XREC-SER and OMWT-RECIP to receive

transmissions from wireless sensors. OMWT-SOFT-OPC can also use multiple

OMWT-RECIP Receivers to receive data through a TCP/IP connection.
When setting up a wireless network, OMWT-SOFT-OPC passively waits for

transmissions instead of actively polling for devices. This can make the acquisition

of sensors take a longer time than for a wired network as OMWT-SOFT-OPC must

wait for the device to transmit. You can speed up this process by pressing the service

button on the device so that it transmits while you are in the OMWT-SOFT-OPC

Wireless Setup screen.
Each device has an entry in the device's INI file section. The INI entry and OPC tag

"polltime" for each device has a different meaning when working with wireless

transmitters. OMWT-SOFT-OPC cannot poll the wireless sensors. It must wait for a

transmission. Therefore, OMWT-SOFT-OPC uses polltime to estimate how

frequently a transmission should come from a device. It also uses a multiple of this

time to determine if a device is offline. This multiple is configurable by the user.

Wireless Setup

If you have OMWT-SOFT-OPC running with a wireless receiver such as an OMWT-

REC232-600 or OMWT-XREC-SER, OMWT-SOFT-OPC will display the Setup

screen when it starts for the first time. The setup screen is the method by which

OMWT-SOFT-OPC acquires wireless devices. The default on the setup screen is to

accept only packets that are sent in service mode from the device (the packet is sent

by pressing the service button on the device.) To change this default, uncheck the

"Service Mode Only" checkbox. OMWT-SOFT-OPC will then display all the

packets it receives. When OMWT-SOFT-OPC receives a packet from a device new

to it, it names the device following the naming conventions detailed below, and it

displays the device's name and serial number in the window.
You have several options after the device has been displayed. The "Clear New"

button will clear all the devices that have just been received. The "Delete" button

will delete a single device. Click on a device to select it and click on "Delete" to