Access from the user program
KL1xxx 45Version: 1.0.0
5 Access from the user program
5.1 Examples of Register Communication
The numbering of the bytes in the examples corresponds to the display without word alignment.
5.1.1 Example 1: reading the firmware version from Register 9
Output Data
Byte 0: Control byte Byte 1: DataOUT1, high byte Byte 2: DataOUT1, low byte
0x89 (1000 1001
bin
) 0xXX 0xXX
Explanation:
• Bit 0.7 set means: Register communication switched on.
• Bit 0.6 not set means: reading the register.
• Bits 0.5 to 0.0 specify the register number 9 with 00 1001
bin
.
• The output data word (byte 1 and byte 2) has no meaning during read access. To change a register,
write the required value into the output word.
Input Data (answer of the bus terminal)
Byte 0: Status byte Byte 1: DataIN1, high byte Byte 2: DataIN1, low byte
0x89 0x33 0x41
Explanation:
• The terminal returns the value of the control byte as a receipt in the status byte.
• The terminal returns the firmware version 0x3341 in the input data word (byte 1 and byte 2). This is to
be interpreted as an ASCII code:
◦ ASCII code 0x33 represents the digit 3
◦ ASCII code 0x41 represents the letter A
The firmware version is thus 3A.
5.1.2 Example 2: Writing to an user register
Code word
In normal mode all user registers are read-only with the exception of Register 31. In order to deacti-
vate this write protection you must write the code word (0x1235) into Register 31. If a value other
than 0x1235 is written into Register 31, write protection is reactivated. Please note that changes to
a register only become effective after restarting the terminal (power-off/power-on).
I. Write the code word (0x1235) into Register 31.
Output Data
Byte 0: Control byte Byte 1: DataOUT1, high byte Byte 2: DataOUT1, low byte
0xDF (1101 1111
bin
) 0x12 0x35
Explanation:
• Bit 0.7 set means: Register communication switched on.
• Bit 0.6 set means: writing to the register.
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