TransCore Amtech IT2200, Инструкция по установке, обслуживанию и ремонту

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D-3
Appendix D
Hardware Interfaces
This appendix describes the physical interconnections within the IT2200
Reader System with Multimode Capability.
Reader Logic Card Hardware Interconnection
Interconnection to the IT2020 reader logic card includes an ISA bus interface. All
power and communications to the lane controller computer are routed through this
standard interface. Interface lines from the reader logic card to the RF module are
attached via an external connector.
The default configuration settings are
IRQ = 5 Possible range is 5, 6, 7, 10, 11, 12, 14, and 15
(Or no-interrupt with all switches off)
I/O (Input/Output) address = 220H Possible range 000H to 3FCH
Note: Many PCs that have an installed sound card use 5 as its IRQ and 220H for
its I/O address. If you are installing the IT2020 Reader Logic Card into a PC with a
sound card you must change the reader logic card I/O address and IRQ setting.
•
Frequency Enable Switch (S1) Placing this switch to the right, places the reader
into Frequency Programming Mode, which lets the user change frequencies of the
RF. This switch enables the use of the Set RF Frequency command.
•
I/O Address Switch (S2) The switch for setting the I/O address has 8 positions,
which controls the bit value for A9 through A2, with A1 and A0 defaulting to 0.
When the switch is placed in the ON position, it corresponds to a Hi State - 1. An
example of setting the switch to equal 220H (default) is shown below. The possi-
ble range of the I/O address switch S2 is from 000H to 3FCH.
•
Interrupt Request (IRQ) Switch (S3) The IRQ switch provides selection of the
ISA interrupt. The switch has 8 positions and when on, corresponds to the Inter-
rupt selected. Note that all switches OFF will provide operation in the polled
mode. Setting a switch to ON selects that interrupt.
•
Hardware (H/W) Version Switch (S4) The H/W Version Switch sets the hard-
ware version number on the logic board.
Caution
Switch S4 is set at the factory and should not be changed.