User`s guide

HopNet RS-232 Serial ModBus Radio

Introduction

The HopNet family of products provides reliable wireless connectivity for either

point-to-point or point-to-multipoint applications. HopNet products are built around

the WIT2410 radio transceiver, which employs frequency hopping spread spectrum

technology. This technology ensures:

• Maximum resistance to noise

• Maximum resistance to multipath fading

• Robustness in the presence of interfering signals

The HN-210D and HN-210DX are NEMA 4X weatherproof versions of the HopNet

product line. The HN-214D, which is a HN-210D with a 4 ft. cable, is also available.

The interface to the HopNet D and DX versions allows the Host to communicate with

the Remote unit through an integrated 50 ft (15 meter) cable. The HopNet D and DX

versions can act as either Bases or Remotes.

The HopNet D Remote has an internally mounted 6 dBi patch antenna. The built-in

antenna of the HopNet D case greatly eases outdoor installation since no antenna

feedline cable or adapters are needed. The 6 dBi antenna gain increases the radiated

EIRP to +24 dBm and the effective receiver sensitivity to –99 dBm. The HopNet DX

has a TNC connector for attaching one of the following external antennas:

OMNI242 OMNI249

OMNI2412 YAGI2415

RWA242 RWA249

CORNER249 CORNER2414

PAR2418 PAR2424

HopNet Benefits

The HopNet family of products is built with rugged enclosures compliant with IP 66

and NEMA 4X standards for outdoor and harsh industrial environments. All Hopnet

products work with each other and can be mixed and matched in a single network. All

HopNet Products are WIT2410 compatible and can be used with WIT2410 OEM

based products as well as with the SNAP 2410 10/100Base T access point.

Operating Frequency

The HopNet family operates in the 2.4 GHz ISM band that allows for license-free use

and worldwide compliance.

HopNet Frequency Hopping Spread Spectrum Advantages

In the frequency domain, a multipath fade can be described as a frequency selective

notch that shifts in location and depth over time. Multipath fades typically occupy

five percent of the band. A conventional radio system typically has a five percent

chance of signal impairment at any given time due to multipath fading.