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C656M-E (4/07) 15
5. Set the P2 jumper on the TXB-V to the proper termination setting (refer to Figure 13). 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 13. TXB-V Termination and Baud Rate (Bottom View)
6. Set the baud rate for the TXB-V translator board (from the controller). Use the P3 and P4 jumpers
(refer to the following table).
7. Install the TXB-V translator board (refer to Figure 14 and Figure 15 on page 16):
a. Remove the cover from the top of the dome drive.
b. Remove the shorting plug from the 16-pin connector located on the Spectra Mini dome circuit
board.
NOTES:
• Discard the 4-40 and 6-32 screws and their lock washers; they are not used in the
Spectra Mini dome.
• Save the 16-pin shorting plug and the original cover from the Spectra Mini dome.
Otherwise, the unit cannot be converted back to a Pelco-controlled system.
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