3
Configuration
The Operating Modes and Message Delay Times of the A300 are set with jumper JMP1 and DIP switches SW2 and
SW3 located on the circuit board. Tables 1 and 2 list the switch settings.
Vehicle Detect Configuration
JMP1
Position A
- Position A is the default selection for most 3M Intercom installations.
Position B
- Position B is used when an optional relay must be added to trigger the A300. An optional relay may
be required in cases where the HME or Panasonic intercom triggers an external service timer. (See Figure 8)
Note:
When JMP1 is in position B, a +5Volt pull-up voltage is applied to VEH DET + (J9 terminal 8). Then, a
contact closure between VEH DET - (J9 terminal 9) and COM (J9 terminal 3, 6 or 11) will initiate a vehicle
detect trigger.
Mode Configuration
SW2
A description of each mode follows. Table 1 lists the DIP switch settings.
Message 4 External Trigger
When SW2 number 1 is ON, the fourth message can only be played to the outside menu speaker when
triggered from MSG4TRG, connector J9-10. The trigger signal should be a contact closure from
MSG4TRG to COM (i.e. fire alarm, etc.).
Automatic message Repeat
When SW2 number 2 is ON, the selected message(s) will continuously repeat when triggered by a vehicle
detect signal. The message(s) will stop when the vehicle detect signal is disengaged.
Note:
The Automatic Message Repeat will only work with a presence-type vehicle detector (i.e. Loop
detector, Sonic detector).
Vehicle Detect Trigger Polarity
When SW2 number 3 is OFF, the A300 will be triggered by a positive going (low to high) vehicle detect
signal. When SW2 number 3 is ON, the A300 will be triggered by a negative going (high to low) vehicle
detect signal.
Pulse/Presence Vehicle Detector
When SW2 number 4 is OFF, the A300 requires a presence-type vehicle detect signal (i.e. Loop detector).
When SW2 number 4 is ON, the A300 requires a pulse-type vehicle detect signal (i.e. air switch).
Timer Trigger Polarity
When SW2 number 5 is OFF the TTL output at TIMER TRG, connector J9-12 will be a positive going
(0.8V to 5.0V) signal when triggered by a vehicle detect signal. When SW2 number 5 is ON the TTL
output at TIMER TRG will be negative going (5.0V to 0.8V) when triggered by a vehicle detect signal.
Music Mode
When SW2 number 6 is ON, the A300 will play music at the menu speaker when a message is not
playing. The input music source must have its own balanced output power amplifier and volume control
capable of driving the 4 – 8 ohm balanced menu speaker. When SW2 number 6 is ON, the A300 will
pass audio from the music source to the menu speaker. When a vehicle triggers the A300, the music will
be interrupted while the greeter plays its message(s). The music will resume playing at the menu speaker
2 minutes after the vehicle detect signal is disengaged. Note:
Use this feature only with the 3M C921BA
Base Station.
Menu Microphone Mute
When SW2 number 8 is ON, the inbound audio from the Menu Microphone will be muted while the
A300 plays message(s) to the Menu Speaker.
The message(s) can only be heard if the A300 AUDIO OUT
line is connected to the C760/C960 AUDIO IN line (use AUDIO OUT potentiometer on A300 to adjust
message volume)
. When SW2 number 8 is OFF, in full duplex operation, the A300 message will be heard
through the menu microphone while the message is being played through the menu speaker.
