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Pelco Manual C538M-A (3/04) 5
3.0 PRE-INSTALLATION INFORMATION
3.1 FRONT VIEW AND DIP SWITCH ACCESS
Figure 1 illustrates a front view of the unit with its front panel removed. Power (green)
and Data (red) LEDs occupy opposite ends of the unit’s front panel. As illustrated,
the removal of the five flat-head Phillips screws that hold the front panel in place
allow access to the units three DIP switches and the reset switch. All other switches
and connectors are on the rear of the unit.
3.1.1 DIP Switches
The relay interface unit has three 10-position DIP switches that configure the com-
munication parameters for the unit as well setting the parameters for relay contact
output operation. DIP switch functions are discussed in Section 3.3.2, DIP Switch
Settings.
3.1.2 LEDs
The green POWER LED located on the left side of the front panel of the unit comes
ON at power up.
The red DATA LED located on the right side of the front panel continually flashes on
and off at a regular rate (about 1/2 second intervals) until the first valid command is
received. The LED will not flash again until another valid command is received. In
cascaded configurations, each relay unit only indicates receiving data when the
data has the corresponding address of the unit. In other words, LED activity is
address specific.
In addition, if power is cycled, if a DIP switch slide switch position is moved, or if a
front panel reset occurs, the LED will again flash intermittently until the first valid
command is received.
Figure 1. Front View with Panel Removal