Frequently Asked Questions
A: Advances in consumer wireless telephones led to the marketing declaration that 2.4GHz is better than 900MHz. Although questionably true for them, it is not true for SCADA solutions. 900MHz offers longer distance communications than 2.4GHz because 900MHz antennas are larger than equivalent 2.4GHz antennas (termed aperture). Additionally, 900MHz signals pass through objects (trees, foliage, buildings) with less RF loss than 2.4GHz so again, for both indoor and outdoor applications, 900MHz is best. Some years ago the 900MHz band was noisy and the basically unused 2.4GHz, quiet. Today noise in either band is relatively equal.
Q: The application environment is exceptionally noisy electrically (arcing contacts). Will the radio modems be able to cope?
Q: The radio modems are required to operate in the vicinity of moving cranes. Will they be adversely affected by the varying multiple paths?
Q: Radio modems are generally known to time-out occasionally for some tens of milliseconds. Are Data-Linc's models immune to this?
Q: I have a precision real-time SCADA application. Can Data-Linc's radio modems handle this?
Q: I have an application in Europe. Does Data-Linc Group offer radio modems that can be used in European Union "EU" countries?
Q: Without running wires to the pump or tank, what OPTIONS do I have if I need to turn on a pump motor and or read a tank level 5 or 10 miles away?
Q: Do exceptional weather conditions significantly impact operation of radio modems in the 2.4GHz band?
Q: What is EIRP and why should this concern me in an RF installation?
Q: I need to install an antenna on the top of a tower. Does Data-Linc Group provide lightning arrestors?
They will need to know the "RF" frequency of the radio modems (902-928MHz or 2.4-2.4835GHz), if you use a Data-Linc Group standard coax cable assembly the lightning arrestor will need to have a female "N" connector on the modem side and a male "N" connector on the antenna side.
Q: I will need to use yagis. Should I set them up as vertical or
See also Antenna Installation.
Q: Will information be secure when transmitted via SRM wireless modems?
Q: How can the SRM be used on a DH+ or DH485 network?
Q: Do I need an RF site survey before installation?
Q: What is the maximum number of Remote radio modems a Master can have on its network?
Q: Why does the SRM6000 require line-of-sight?
Q: Will the SRM interface with other Data-Linc Group modems?
Q: What advantage do I get by using the SRM6000 whose range is over 20 miles and a maximum port speed of 115.2 Kbps, when all I need to achieve is 2 miles or less at a port speed of, say, 9600 Kbps?
Q: Why does Data-Linc Group pre-configure the SRM? Is it too complicated to configure in the field?
Q: Do I need separate units for Master, Remote and Repeater?
Q: Do I need two radios and two antennas to make a Repeater?
A: Absolutely. Just like Data-Linc's SRM6000 serial radio modem, the SRM6210E Ethernet radio modem can be used at -40° to +75°F. In addition, it provides the same exceptional data reliability with omni directional antennas (no expensive Yagi required) and has a range of up to 35 miles without Repeaters.
Q: What is the difference between Data-Linc's AE485 and AE422and RS485/422?
Q: Is there a standard for Ethernet?
There are several types of Ethernet systems. The most popular is the 10BaseT standard for Ethernet networks which uses AWG24 Unshielded Twisted Pair (UTP) cable for connection to the node. The physical topology of the standard is a star, with nodes connected to a wiring hub, or concentrator. Concentrators can then be connected to a backbone cable that may be coax or fiber optic. The node cable has a maximum length of 100 meters; consists of two pairs for receive and transmit and is connected via 10 BaseT plugs.
Q: Where did TCP/IP originate?
Q: What is "Smart SpectrumTM" technology?
Q: How can I get answers to some other questions I have about data communications and my application?
||Features & Benefits | Focus Item | Product Selection Guides | Catalog | PDF Library | Order Information|
||Engineering Specifications | Articles & Technical Papers | Installation Information|
||GE Fanuc | Omron | Rockwell Automation | Schneider Electric | Siemens | Technology Partners|
||Security | Traffic | and other industry application notes and diagrams|
||Distributors | System Integrators | OEMs|
||Tradeshows and Events | Press Releases | Newsletters|
||Overview | Jobs/Employment | Office Locations/Contact Information|
|© 1996-2015 Data-Linc Group. All rights reserved.|