Trigger Signals (Pin 2)
The trigger connection turns on the RF power when shorted to I/O ground and the AI1422E
Reader System has been programmed with the RF Follows Trigger command (
!642
).
RS–422 Interface (Pins 5-9)
The RS–422 interface is a terminal block connector. In real-time mode, tag IDs are read and
passed on to the host processor.
RF Power Output (Pin 14)
The transistor-transister logic (TTL) RF power LED goes active high when the reader system is
configured for the RF power to be on and the ON/OFF switch is set to ON. The RF power signal
may be connected to an LED for monitoring purposes.
The main power relay is referenced to 5V
iso
and I/O Ground.
Main Power Output (Pin 15)
The TTL main power signal goes active high when the ON/OFF switch on the front panel is
switched to ON. The main power signal may be connected to an LED for monitoring purposes.
The main power relay is referenced to 5V
iso
and I/O Ground.
Tag Lock Output (Pin 16)
The TTL lock signal shows the presence of a tag. The lock signal goes active high when a valid
tag is in the RF field of the antenna and may be connected to an LED for monitoring purposes.
The tag lock relay is referenced to 5V
iso
and I/O Ground. The falling edge of the tag lock signal
can be increased by using a 10K ohm resistor.
Power Connector
The power connector on the front panel of the AI1422E Reader System is a panel mount, right angle,
EPIC ® HA-3 style 3 pin plus ground rectangular connector.
Interface Selection Switch
The AI1422E Reader incorporates a communications interface selection switch, which allows on-the-fly
changes to the communications mode. This switch allows selecting the reader’s receive communications
interface. All communications interfaces are configured for simultaneous transmit, but only the interface
selected by the switch is active for commands transmitted into the reader.
Chapter 2 Interface Connections
TransCore Proprietary
2–7
