Encompass 4 Reader System Guide
2-22
2919. Use a twisted pair for the red (Data1) with ground (yellow of the black/yellow
pair), and a twisted pair for blue (Data0) with ground (yellow of the black/yellow
pair). The third pair of the three-pair cable can be used for a spare in the event either
of the other two pair are damaged or fail. The cable shield should be tied to a single-
point earth ground on the controller end of the cable.
Input/Output Circuits
To connect the Encompass 4 Reader to external equipment such as a treadle or traffic
control light, install wires from these devices at the junction box. The Encompass 4
Reader input circuit is designed to connect to a dry contact closure. The Encompass 4
Reader output circuits are single-pole, double-throw relays providing dry contact clo
-
sures. These contacts are rated at 42.2V AC peak (30V
rms
) or 60V DC, at 1 A maxi-
mum with noninductive load.
Output circuits are not intended for the direct control of electromechanical devices
such as motorized gates and barrier arms. For such applications, the Encompass 4
Reader output circuits should be used to drive a secondary, appropriately rated
high-power relay.
External Antenna Interface
For sites using an Encompass 4 Reader with external antenna, the design must include
an interface cable between the Encompass 4 Reader and the compatible antenna cho
-
sen for the site. The antenna interface is RF coaxial cable with male Type N sockets on
each end.
Table 2-6 is a summary of coaxial cable performance. Figures indicate maximum
lengths of cable in feet.
Table 2-6 Reader to Antenna Cable Performance
Cable Type
a
Overall
Diameter (in.)
915MHz
Low Medium
Loss
b
Loss
c
RG–223 0.216 6 18
RG–214 0.425 12 37
FHJ1–50 0.250 16 48
FSJ1–50 0.250 15 45
LDF2–50 0.375 28 85
FSJ4–50B 0.500 27 83
LDF4–50A 0.500 42 128
LDF5–50A 0.875 76 229
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