Beckhoff KS2542 Manual page 41

Observe the register description!
The value of 0x0002 given here is just an example!
The bits of the feature register change the properties of the terminal and have a different meaning, depend-
ing on the type of terminal. Refer to the description of the feature register of your terminal (chapter Register
description) regarding the meaning of the individual bits before changing the values.
Input data (response from the Bus Terminal)
Byte 0: Status byte
0xA0 (1010 0000 )
bin
Explanation:
• The terminal returns a value as a receipt in the status byte that differs only in bit 0.6 from the value of
the control byte.
• The input data word (byte 1 and byte 2) is of no importance after the write access. Any values still
displayed are invalid!
IV. Read Register 32 (check changed feature register)
Output Data
Byte 0: Control byte
0xA0 (1010 0000 )
bin
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 indicate register number 32 with 10 0000
• The output data word (byte 1 and byte 2) has no meaning during read access.
Input Data (answer of the Bus Terminal)
Byte 0: Status byte
0xA0 (1010 0000 )
bin
Explanation:
• The terminal returns the value of the control byte as a receipt in the status byte.
• The terminal returns the current value of the feature register in the input data word (byte 1 and byte 2).
V. Write Register 31 (reset code word)
Output Data
Byte 0: Control byte
0xDF (1101 1111 )
bin
Explanation:
• Bit 0.7 set means: Register communication switched on.
• Bit 0.6 set means: writing to the register.
• Bits 0.5 to 0.0 specify the register number 31 with 01 1111
• The output data word (byte 1 and byte 2) contains 0x0000 for reactivating write protection.
KL2542/KS2542
CAUTION
Byte 1: DataIN1, high byte
0xXX
Byte 1: DataOUT1, high byte
0xXX
Byte 1: DataIN1, high byte
0x00
Byte 1: DataOUT1, high byte
0x00
Version: 2.1.0
Access from the user program
Byte 2: DataIN1, low byte
0xXX
Byte 2: DataOUT1, low byte
0xXX
.
bin
Byte 2: DataIN1, low byte
0x02
Byte 2: DataOUT1, low byte
0x00
.
bin
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