User's Manual

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Mixed Data Access
Function Description
Processing data carriers
Small read/write programs can be stored in the BIS L-60_2 processor’s EEPROM.
The Mixed Data Access function is useful when the required information is stored on the data
carrier at various addresses. This function makes it possible to read out this “mixed”, i.e. non-
contiguously stored data from the data carrier in a single procedure and using just one com-
mand.
Up to 10 programs with up to 25 instructions can be stored. Each program instruction con-
tains a “start address” and a “number of bytes” specification. The amount of data for reading
may not exceed 2 kB.
Storing a program:
The command identifier 06
Hex is used to send the read/write program to the BIS L-60_2
processor. One program per command can be stored. All 25 program records plus an addi-
tional 2 bytes with FF
HexFFHex as a terminator must always be sent. This means a total of
104 bytes of information per program must be sent (including the command identifier and
program number).
The individual program records must all be contiguous. They must be sent one after the other
and be terminated with FF
HexFFHex as a terminator. It is recommended that the remaining, un-
used memory sector be filled with FF
HexFFHex.
If an address range is selected twice, the data will also be output twice.
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L60_2-019_828132_1007-e.p65
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Mixed Data Access
(continued)
The following shows the structure of a program:
Program structure Subaddress Value Range
Command designator 01Hex 06Hex
1. Program record
Program number 02
Hex 01Hex 01Hex to 0AHex
1st data record:
Start address Low Byte 03
Hex
Start address High Byte 04Hex
Number of bytes Low Byte 05Hex
Number of bytes High Byte 06Hex
2nd data record:
...
25th data record:
Start address Low Byte 03
Hex
Start address High Byte 04Hex
Number of bytes Low Byte 05Hex
Number of bytes High Byte 06Hex
Terminator FFHex FFHex
To store a second program, repeat this process.
The procedure for writing these settings to the EEPROM is described in the 7th example on
45...47.
Replacing the EEPROM is described on
58 for BIS L-6002 and on 68 for BIS L-6022.
Function Description
Processing data carriers