Hardware Interfaces
D-21
• Receives a differential input from the reader logic card and outputs a single-ended
signal to the RF downlink and uplink functions for control of the output stage
power. RF power on/off is also controlled via a microcontroller output under com-
mand from the reader logic card.
• Provides control output and status inputs for the RF uplink function — Initializes
the RF phase locked loop (PLL) frequency. Controls the RF output power attenu-
ation. Controls RF power on/off with a discrete differential input and reader com-
mand.
• Provides control output and status inputs for the RF downlink function — Initial-
izes the RF PLL frequency as in the RF uplink. Controls the RF output power
attenuation as in the RF uplink. Stores settings as in the RF uplink. Controls RF
power on/off with a discrete differential input and reader command as in the RF
uplink.
• Provides control for the check tag — The check tag simulates an automatic vehi-
cle identification (AVI) transaction thus providing a means for the reader to check
the AVI operation. The check tag, activated on command by the lane controller,
provides a test of the antenna, RF source, preamplifier, encoder/ decoder, micro-
processor, communications port, and I/O control.
The reader controls check tag operation with an enable logic signal, which
provides the check tag to communicate with the reader, as a normal tag. The check
tag may be set to operate automatically at a periodic rate, or under command from
the lane controller through the reader.
RF Module Interface Connector
Table D-14 lists the pin-socket signals and descriptions for the IT2611 RF Module-to-
IT2020 Reader Logic Card connector.
The cable shields are not connected at the IT2611 RF Module. Tie all the shielded
bare wires together and connect them to a good ground at the IT2020 Reader Logic
Card end.
Table D-14 RF Module-to-Reader Logic Card Interface Connector
IT2611 RF
Module Socket
IT2020 Reader
Logic Card
DB-25 Pin
Signal In/Out Description
A 1 IF_A+_I2000 In Uplink tag data, channel A+
T 2 IF_A+_ATA In Uplink tag data, channel A+
D 3 IF_B- In Uplink tag data, channel B-
E 4 IF_C+ In Uplink tag data, channel C+
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