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Address
Mnemonic
:000H
boot_code
:004
link_state
:005
link_address
:006
link_protocol
:007
link_baud_rate
:008
reserved1
:009
config_data
:00A
init_status
:00B
running_status
:00C
int_status_to_host
:00D
int_status_from_host
Allen-Bradley Parts
Dual port Layout
The following description of the dual port gives address, mnemonic, size,
read/write permission for host/KTx, and a description of dual-port
variables. Addresses :000-016H are common for all KTx protocols and are
not necessarily applicable to the scanner protocol. These are indicated by a
blank description field.
Size
Host
KTx
4
R/W
R
1
1
1
R/W
R
1
R/W
R
1
1
R/W
R
1
R
W
1
R/W
W
1
R
W
1
R/W
R/W
Appendix
A
Description
Must be initialized by the host to hex C3 00 00 00.
Must be initialized by the host to 06h.
Must be initialized by the host to FC (57.6k), FD (115.2K),
or FE (230.4K)
Allows the host to configure the scanner operation.
Bit 0: when high, the scanner will interrupt the host at the
end of each time through the scan list.
Bit 1: reserved.
Bit 2: when high, the scanner will interrupt the host
whenever there is a change in the Input Image Table.
Bits 3-7: unused.
While initialization is in progress this will be set to 1.
If initialization fails an error code will be written here,
otherwise 0 will be written here to indicate success.
Host clears these bits:
Bit 0: when high, the scanner is at the end of the scan list.
Bit 1: when high, an adapter replied to wrong address.
Bits 2-7: not used.
Used by the KTx to tell the host the type of interrupt the
KTx just sent to the host.
Used by the KTx and host for handshaking. The host may
interrupt the KTx with one of two interrupt types:
COMMAND (01) or CONFIRMATION_PROCESSED (02).
The KTx will write INTERRUPT_PROCESSED (0) when it
has finished processing the interrupt from the host.
A-1
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