Chapter 6 Commands
The AI1422E 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.
Note: If you are using Wiegand mode, you must connect the PC or laptop to the AI1422E 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 connected during this procedure.
Operating Modes
The AI1422E Reader has three modes of operation: Data Mode, Command Mode, and Download Mode.
The software for the AI1422E Reader contains two separate programs — Boot and Application. The Boot
program has control of the AI1422E Reader on startup and when operating in download mode. The
Application program has control of the AI1422E Reader during a command mode operation and holds the
application code. Together, they control the AI1422E Reader in the three modes of operation.
Data Mode
The AI1422E Reader is in Data Mode on power-up. While in Data Mode, the AI1422E Reader sends all
communications to the host computer as data messages, such as tag IDs and reports. Reports provide
information on Input 0 and Input 1 status changes, a presence without tag report, and buffer overflow
information. The host computer can send only four commands to the AI1422E Reader while in Data Mode
(
Table 1 Data Mode Commands
Data Mode Commands
Type
Description
Command
Status Request
Causes the interrogator to respond with a message
containing information indicating the rolling transponder
seen count and the count of host error messages.
~~@@
Retransmit Request
Requests the interrogator to retransmit the last tag ID
read. (BB must be entered in upper case).
~~BB
Enter Command Mode
Disables reading and reporting of tags and changes
the reader from Data Mode to Command Mode. (CC
must be entered in upper case). Refer to
~~CC
Enter Command Mode Disables reading and reporting of tags and changes the
reader from Data Mode to Command Mode.
!01
There is no carriage return or line feed required for any of the
~~
commands. Commands
!01
require a
carriage return.
No Response is received with the
~~CC
and
!01
commands.
Chapter 6 Commands
TransCore Proprietary
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