Installation Guide
HM ELECTRONICS, INC.
2848 Whiptail Loop, Carlsbad, CA 92010 USA
Phone: 1-800-848-4468 Fax: 858-552-0172
Website: www.hme.com Email: [email protected]
HME# PUB - 00187
Rev A 7/27/22
VDB102C & VDB102CR
VEHICLE DETECTOR BOARD
IMPORTANT
: The following instructions cover the VDB102C and the VDB102CR Vehicle Detector Board. When
handling these boards, use proper grounding procedures to avoid electrical damage to the board.
INSTALLATION
1. Remove the drive-thru audio or timer system power adapter from its electrical outlet.
2. If the VDB102C/VDB102CR will replace an existing VDB101, do a, b, and c below. If not, skip them and go on
to the following step.
a. Disconnect the loop cable from TB1 on the VDB101.
b. Disconnect the VDB101 interconnect cable from its connector on the base station
or control unit circuit board. Note the connector and its location.
c. Remove the VDB101 by lifting it off the plastic standoffs that hold it in place.
3. Position the VDB102C/VDB102CR over the three plastic standoffs on the base station or control unit circuit
board and press it firmly until the standoffs snap through the holes on the VDB102C/VDB102CR. See Figure 1.
4. Connect the loop cable to TB1 at the lower right corner of the VDB102C/VDB102CR. See Figure 1.
5. Connect the VDB102C/VDB102CR interconnect cable to P1 at the upper left corner of the VDB102C/VDB-
102CR. See Figure 1. Be certain the plastic catches on the cable connector are aligned with the plastic catches
on the P1 connector. The color-coded connector wires must also match the pin positions shown in Figure 1
below. Connect the other end of the interconnect cable to the circuit board in the base station or control unit
according to installation instructions from the drive-thru audio or timer system. If the installation instructions are
not available, call HME at 1-800-848-4468.
6. This step is only for the VDB102CR (for VDB102C, skip to step 7): If any external equipment will be used that
requires a vehicle detect signal to operate, connect it to J3, Relay out 1 or Relay out 2, see Figure 1.
7. Reconnect the drive-thru or timer system power adapter to its electrical outlet.
8. Be certain the LED on the VDB102C/VDB102CR is lit when a vehicle is on the loop. If it is not, be certain, that
all connections are tight. If it is still not lit, call HME at 1-800-848-4468.
NOTE:
If it is necessary to change the functions of the VDB102C/VDB102CR, refer to the DIP Switch Settings on
page 2 of this sheet. Normally, no changes will be required.
Figure 1.
VDB102CR
(Relay K1 and connector J3 are not
populated on the VDB102C board.)
P1 Pins:
3 (black): Output/Sig
2 (red): +12 VDC
1 (shield): GND
J3 Pins (VDB102CR only)
Relay out 1
1 - NO1
2 - NC1
3 - COM1
Relay out 2
4 - NO2
5 - NC2
6 - COM2
Plastic Standoff
Loop Connector
Plastic Standoffs
LED
3 2 1
NOTE:
Adjust switches as needed before
installing the VDB102C/CR. See
page 2 for DIP Switch Settings.
