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HopNet RS-232 Serial ModBus Radio
Guidelines for Installation
When installing your system, always consider the following points:
Directional antennas are best for remote unit sites. They may increase the cost, but
they confine the transmission path to a narrow lobe and minimize the interference
from nearby stations.
For systems with constant interference present, you may need to change the polarity
of the antenna system and reduce data streams. Groups of short data streams are more
reliable and have a better chance of success in the presence of interference than do
long data streams.
Systems installed in rural areas are least likely to encounter urban interference.
Multiple HopNet systems can operate in close proximity to each other but require a
unique network address.
Poor quality coaxial cables will seriously degrade system performance. Use low- loss
cable that is suitable for 2.4 GHz operation.
Short cable runs minimize signal loss.
Refer to the section
Troubleshooting
for additional information on installing a radio.
Aiming the Antenna and Placing the Remote
Use the following guidelines for aiming the antenna and placing the Remote;
•
Do not place anything immediately in front of the antenna that could obstruct
its radiation pattern. Because the antenna in the HopNet Remote is inside the
unit, the antenna must have a clear line of sight.
NOTE: Use the sticker on the HopNet Remote unit to help you locate and aim the
antenna. The sticker indicates which direction the antenna is pointing.
•
Be sure the antenna end of the HopNet radio Remote faces the Base or
Repeater that it is communicating with. Our tests have found that antenna
placement is not critical as long as the patch antenna is facing in the general
direction of the other end of the link.
•
If possible, place the Remote unit at a higher elevation than the structures
surrounding it to increase range and link reliability. Since the Remote will
operate with up to 100 feet of interconnect cable between it and the Host, you
can mount the unit on top of a building or other structure that will provide
higher elevation.
Interconnect Cable
The HopNet radios come with 50’ (15 meters) of high quality interconnect cable.
The cable may be lengthened by adding an additional 50’ cable (part no.:
CBLEXT50). The maximum cable length that the HopNet radios will support is 100’
(30 meters).
©
2000- 2004 Cirronet
™
Inc
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M-2410-0022 Rev B