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10 C656M-E (4/07)
Spectra III/Spectra IV Installation
To install the TXB-V translator board in a Spectra III/Spectra IV Series:
1. Turn off power to the dome system.
2. Remove the lower dome.
3. Remove the dome drive by pressing in the blue and red tabs on the sides of the dome drive. Gently
rock the dome drive to release it from the back box.
4. Set the P2 jumper on the TXB-V to the proper termination setting (refer to Figure 6). Note the
following:
• By default, the P2 jumper is installed in the unterminated position.
• All TXB-Vs in a daisy chain, except the last unit, must be unterminated.
• The total wire distance from the Vicon controller to the last TXB-V in a daisy chain must be
less than 4,000 ft (1,219 m).
• A maximum of 10 receivers can be installed on a single daisy chain.
• To unterminate a TXB-V, remove the P2 jumper from the TXB-V and place it over one pin for
storage.
NOTE: When combining Pelco and Vicon receivers in the same system, refer to the Vicon manual for
proper RS-485 configuration of the Vicon receiver(s).
Figure 6. TXB-V Termination and Baud Rate (Bottom View)
5. Set the baud rate for the TXB-V translator board (from the controller). Use the P3 and P4 jumpers
(refer to the following table).
Baud P3 P4
600 OFF OFF
4800* ON ON
9600 OFF ON
19.2K ON OFF
*Factory default.
16-PIN CONNECTOR
P2 JUMPER
P3 & P4 JUMPERS
P2 UNTERMINATED
P2 TERMINATED