4
Existing interference at the site should be shielded, removed, or positioned farther
from the Encompass 4 Reader.
Electrical and Communications Requirements
Measured voltage at the Encompass 4 Reader MUST be at least 16V for proper
operation. It is important to use TransCore approved transformers and cable
lengths. TransCore does not endorse or support RF cable lengths greater than 35
feet. See the
Encompass 4 Reader System Guide
for detailed information.
The reader is available as an RS– 232 or RS– 422 model. The proper configuration
depends on the distance between the reader and the computer room. Maximum
distance for the RS– 232 (3-wire serial) is 50 feet, while RS– 422 (4-wire differential
signal) maximum distance is up to 4000 feet. You may adjust the baud rate to
accommodate noisy environments.
If you wish to use Wiegand format tags, you must first:
•
Connect the Encompass 4 Reader using the RS– 232 or RS– 422
interface,
•
Set all necessary operating parameters in the reader,
•
Set the Encompass 4 Reader’s configuration to Wiegand,
•
Then connect the Encompass 4 Reader to the Wiegand interface.
SLOPE
METAL GRATE
METAL SIGN
Possible Sources of RF Interference or
Poor Performance
•
Metal fences, gates, posts, signs, grates
•
Wet or icy slopes
•
Walls, buildings
•
Curve at entrance
•
Gate relays
•
Reader incorrectly located
METAL GATE
SLOPE
CURVE
METAL POLE
