Francis Searchlights Voyager 2 User Instruction & Installation Manual page 25

FBUS INTERFACE UNIT (if supplied)
OVERVIEW
Francis Searchlights FBUS system is designed to allow multiple control pan-
els to manage a number of searchlights on a common data cable. The data
system is application specific and, as such, has a fixed data rate and complex
timing. The FBUS interface offers a simplified and less time constrained
communication interface to the FBUS system over a number of different phys-
ical layer communication standards and data rates.
POWER / CONNECTIONS
The interface draws a supply from the FBUS, no external power supply is re-
quired. The interface connects to the four-wire FBUS system like any other
FBUS system component. The four-wire interface provides a 24V supply and
RS485 communications with FBUS.
Connection to the external interfaces will depend on the user's choice of
communication system. RS422 (4-wire) RS485 (2-wire) and RS232 are all
provided. The RS422 OUT / IN legend on the PCB refers to the data direction
from the perspective of the interface unit. The OUT terminals are the interface
unit transmit connections. The RS232 connector is configured as a DCE and
has all handshake lines looped. No flow control is required. The connections
are listed below; -
1. Line signal detect (linked to pins 4 and 6)
2. TX out
3. RX in
4. DTE (linked to pins 1 and 6)
5. 0V
6. DCE Ready (linked to pin 1 and 4)
7. CTS (linked to 8)
8. RTS (linked to 7)
9. No Connection
OPERATOR INTERFACE
The operator interface is very simple with four buttons controlling a single lay-
er menu system on a 2-line LCD display. A given menu item is selected with
the SEL (select) button. If the menu item has an adjustable parameter this can
be altered using the up and down arrow keys. The revised parameter is stored
using the ENT (enter) button. A list of the menu items is provided below; -
MENU ITEMS
DEFAULT DISPLAY
The default display will be active from switch on until the select button is
pressed. The default display has no adjustable parameters. The display top
line shows the FBUS status. If FBUS is functioning correctly the display top
line will show FBUS-ON. The top line of the display also shows the currently
selected lamp status i.e. on or off. The default display will indicate if the cur-
rently selected lamp is active or not. If the FBUS is working and the currently
selected lamp is responding the bottom line of the display will show the cur-
rent pan and tilt angles.