Installation Guide

Chapter 3
12 Access Point Controller Card (APCC)
Installation Guide Sensys Networks, Inc.
Mapping Wireless Sensors to Contact Closures
The final installation consideration for contact closure cards are the assignment of
sensors to specific channels.
The four channels represent independent contact closures which, in turn, are
actuated by the vehicle detection events transmitted by a defined group of wireless
sensors. Each sensor may be associated with zero or one Card ID/Channel
combinations.
Up to 15 wireless sensors can be associated with the same card/channel, in which
case the sensors are logically “OR-ed” together – meaning that if any sensor on the
channel detects a vehicle, the corresponding contact closes.
The sensor-to-contact closure channel mappings are stored in a sensor database
that resides in memory. The sensor-to-contact closure channel mappings are
maintained within TrafficDOT.
Defining the channel mappings is aided by the use of a Channel Mapping
Worksheet such as the one shown below.
Table 3. Sensor-to-channel mapping worksheet with sample data
Notes
1. The worksheet assumes one sensor per row. Use as many rows as necessary to
assign all necessary sensors to channels.
2. Do not duplicate Sensor ID values. (A wireless sensor may only be assigned
once.)
3. The sample data above depicts representative Card ID values. Since these
values are rarely known prior to field installation, substitute a place-holder
value so that the installer will understand how the wireless sensors are
allocated to the channels.
4. Values for Channel Extension and Location are optional.
Card ID
Channel
(1 - 4)
Sensor ID
Channel
Extension
(opt.)
Location / Lane /
Description (opt.)
3-02 1 06C2 0 East bound, lane 1
3-02 1 06C3 0 East bound, lane 2
3-05 2 14C7 0 Advance C.3
3-06 3 0404 0 Stop bar A1
3-15 1 05D7 0 West bound, lane 1