Troubleshooting
Trango Systems, Inc. SDR900H Rev. B
Page
10
Troubleshooting
Interference or intermittent operation
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Make sure all SDR900H radios are properly grounded.
•
Heavy equipment, such as industrial roof-mounted air conditioners or fan motors, in
close proximity to the radio or cables may cause interference, especially when operating
in RS232 mode. Move the unit/cable away from the source of the interference.
•
Raise the transmitter and receiver antennas above the ground and away from any
obstacles and traffic, including foot traffic.
•
Verify that all connectors are tight, especially the power connectors.
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Shorten the receiver antenna feed cable. It is best to use only those cables supplied
with the equipment.
•
If the system becomes unstable for a period of time on the order of minutes or hours
and then becomes useable again, changing the channel may solve the problem
•
High-power equipment operating near the 902-928MHz band, such as paging system
base stations or cellular phone base stations, may also interfere if they are within several
hundred feet of the radios. Changing the channel, and/or reorienting the antennas, will
most likely solve this type of interference.
•
The cable from the transceiver to the PTZ controller may be too long, corrupting the
digital data. Use category 5 twisted-pair shielded cable for the cable run. The maximum
length run for RS485/422 is four thousand feet, and one hundred feet for RS232.
•
The cable from the transceiver to the camera may be too long, corrupting the digital
data. Use category 5 twisted-pair shielded cable for the cable run. The maximum length
run for RS485/422 is four thousand feet, and one hundred feet for RS232.
•
Interference on video signal when sending PTZ data. Check the system’s grounding,
and use ground-fault isolation transformers if the problem persists.
Data not received
•
Check that the transmit and receive channels, baud rate, mode, and address are set the
same.
•
Verify that all connectors are tight.
