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C3463M (10/09) 7
Pelco P Protocol Control Systems
To compensate for Pelco P protocol control systems from other manufacturers, set SW2-3 to the ON position. This may improve dome control
with some of these control systems.
SW2 SWITCHES 4 AND 5: SERIAL PORT SETTINGS
RS-422 Setting (Default)
SW2-4 and SW2-5 should both be set to the OFF position for RS-422 setting.
For control, only two wires should be connected to the RX- and RX+ connectors on the circuit board inside the back box. For bidirectional control,
four wires should be connected to the RX-, RX+, TX-, and TX+ connectors on the circuit board inside the back box.
RS-485, 4-Wire Setting
SW2-4 should be set to OFF and SW2-5 should be set to ON if a 4-wire serial port connection is used with RS-485.
Note: This setting is most commonly used with Pelco Endura
®
systems.
RS-485, 2-Wire Setting
SW2-4 and SW2-5 should both be set to the ON position if a 2-wire serial port connection is used with RS-485.
This setting is used to allow the Spectra dome system to transmit and receive commands on the same pair of wires. Only two wires should be
connected to the RX- and RX+ connectors on the circuit board inside the back box.
SW2 SWITCHES 6 TO 8: BAUD SETTINGS
Pelco D-type controllers are set for 2400 baud. The default setting for the dome drive is 2400 baud. If you are using a Pelco D-type controller, do
not reset SW2 switches 1 to 3 or SW2 switches 6 to 8.
Pelco P-type controllers can operate at 2400, 4800, and 9600 baud. Set the SW2 switches (6, 7, and 8), located on the base of the dome drive, to
the same baud as the Pelco P-type controller.
SW2 Switch 9: Coaxial/UTP Cable
SW2-9 should be set to the OFF position (default) if you are using coaxial cable. If you are using unsheilded twisted pair (UTP) cable, set SW2-9
to the ON position.
SW2 Switch 10: Termination Setting
When connecting more than one Spectra IV dome system to a single controller, terminate the unit farthest from the controller. Termination is only
required for the last dome in the series.
The dome drive is shipped from the factory in the unterminated (OFF) position. To terminate the dome drive, set SW2-10 to the ON position.
Note: Dome termination is not required for Coaxitron control.
Table A. Baud Settings
Switch Number SW2-6 SW2-7 SW2-8
2400 Baud (default for Pelco D-type control) Off Off Off
4800 Baud (default for Pelco P-type control) On Off Off
9600 Baud Off On Off