3M C960, Service Information

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3
Sensitivity and Operating Modes
The sensitivity and operating modes are set with DIP switch S1 located on the circuit board. Four levels
of sensitivity can be set with S1-1 and S1-2. The delay time is set with S1-3. The operating mode is set
with S1-4. Presence mode is when the relay contacts are held closed while the vehicle is over the loop.
Pulse mode is when the relay contacts close as the vehicle enters the loop and then open. Asterisks on
Table 1 indicate the default factory settings. To gain access to the A200 circuit board and DIP switch
S1, squeeze the corner tabs on the plastic cover and remove it from the base.
SENS MAX *2 3 MIN
S1-1 OFF ON OFF ON
S1-2 OFF OFF ON ON
S1-3 OFF = NO DELAY
* ON = 2 SEC DELAY
S1-4 * OFF = PRESENCE
ON = PULSE
* Default Factory Settings
Table 1. Configuration Settings for DIP switch S1
LED Indicators
Red = Fault condition:
Open loop = Red LED blinks (1 long and 3 short) and relays are energized.
Shorted loop = Red LED blinks (1 long and 2 short) and relays are energized.
Green = Power applied
Yellow = Vehicle is detected