Trango Broadband PTZ-900 - Manual (Page 7)

rev E Trango Systems, Inc. 13 12 PTZ-900 Installation and Operating Instructions
munication is established. If a connection is not made within twenty
seconds, the unit will exit programming mode and enter normal oper-
ating mode. In this event, simply reboot power to the unit and try again.
After entering the program, a screen is displayed showing the current
settings. The user may change the settings and then must click S
AVE
C HANGES AND E XIT . Upon exiting the program and cycling power to the unit,
the settings will become effective. This screen offers the user five options.
PN Sequence. The channel-hopping sequence must be the same on the
transmitter and receiver in order for data to be transferred properly.
RSSI. The Received Signal Strength Indicator is used for receiver to
monitor the radio spectrum on all hopping channels. It is presented as
a bar graph of power (dBm) against frequency (MHz). Useful in trouble-
shooting to determine if any other signals are present in the 900MHz
band. Meaningless if connected to the PTZ-900
TX .
Data Rate. The rate for PTZ data can be set between 1200 and 19200
bps. Parity can be set to odd, even, or none. The settings must be the
same on the transmitter and receiver.
Mode. RS-232 (unbalanced) or RS-485/RS-422 (differential). Select the
mode that matches your PTZ control equipment.
Address. Multiple systems deployed in the same area should have dif-
ferent addresses. Similar to PN Sequence, the address setting must be the
same on the transmitter and receiver in order for data to be transferred
properly. You must click on S
ET A DDRESS to make changes effective
Troubleshooting
Interference or intermittent operation.
9 Heavy equipment such as industrial, roof-mounted air conditioners
or fan motors in close proximity to the transmitter, receiver, or cables
may cause interference, especially when operating in RS232 mode.
Move the unit/cable away from the source of the interference.
9 Antenna polarization may be wrong. The normal polarization for the
AD900-9 antenna is horizontal, since that has been determined to
give the best results in general.
9 Raise transmitter and receiver antennas above ground and away from
obstacles and traffic, including foot traffic.
9 Verify that all connectors are tight, especially the power connectors.
9 Shorten the receiver antenna feed cable. It is best to use only those
cables supplied with the equipment.
9 If the system becomes unusable for a period of time on the order of
minutes or hours and then becomes usable again, changing the PN
sequence may cure the problem. The different PN sequences have dif-
ferent waiting channels that are used to synchronize the hopping se-
quences. Depending on your environment, there may be a 900MHz
transmitter interfering on one of the waiting channels. By changing
the PN sequence of the transmitter and receiver, the waiting chan-
nel will change. Some of the types of equipment that may interfere
are 900MHz cordless phones and wireless LANs if they are very close
to the PTZ-900
RX receiver antenna. The waiting channels are
924.2MHZ (default) PN0, 905.8MHz PN3, 911.8MHz PN2, and
918.2MHz PN1.
9 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 receiver.
Changing the PN sequence and reorienting the receiver antenna will
most likely cure this type of interference.
9 The cable from transmitter to PTZ controller may be too long, cor-
rupting digital data. Use category 5 twisted-pair shielded cable, if
possible, and a maximum length of four thousand feet for RS422 or
one hundred feet for RS232.
9 The cable from receiver to PTZ receiver/driver may be too long, cor-
rupting digital data. Use category 5 twisted-pair shielded cable, if
possible, and a maximum length of four thousand feet for RS422 or
one hundred feet for RS232.
9 Interference on video signal when sending PTZ data. Check the
system’s grounding and use ground-fault isolation transformers if
the problem persists.