Commands
7-3
Chapter 7
Commands
This chapter discusses the host-transmitted commands that are used to
control the Encompass
®
4 Reader configuration and operation.
Introduction
The Encompass 4 Reader is delivered from the factory with specified default settings
that determine how the reader operates. Commands transmitted by the host computer
can change the default settings and control additional features. The commands can be
transmitted by manually entering the commands at the host keyboard if the host is in
terminal emulation mode. The Encompass 4 Reader can also communicate with
ASCII terminals.
Note: If you are using Wiegand mode, you must connect the PC or laptop to the
Encompass 4 Reader using the RS
–232 or RS–422 interface and a terminal emulation
program to send commands to the reader. You can leave the Wiegand interface con
-
nected during this procedure.
Operating Modes
The Encompass 4 Reader has three modes of operation: data mode, command mode,
and download mode. The software for the Encompass 4 Reader contains two separate
programs — boot and application. The boot program has control of the Encompass 4
Reader on startup and when operating in download mode. The application program
has control of the Encompass 4 Reader during data mode and command mode opera
-
tion and holds the application code. Together, they control the Encompass 4 Reader in
the three modes of operation.
Data Mode
The Encompass 4 Reader is in the data mode upon power-up. While in the data mode,
the Encompass 4 Reader sends all communications as data messages, such as tag IDs
and reports, to the host computer. Reports provide information on input status changes
(input0 and input1), a presence without tag report, and buffer overflow information.
The host computer can send only two commands to the Encompass 4 Reader while in
data mode:
• Command #01 Switch To Command Mode changes the Encompass 4 Reader
from the data mode to the command mode. See
“01 Switch to Command Mode”
on page 7-5.
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