Technical data

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Telegram from the DK900 to the Profibus Master (response):
Byte Description
0 Control byte
Bit 7 Toggle bit
Bit 6 1=ACK, 0=NAK
Bit 5 1= · No valid response received via the internal serial
interface;
· or the command is not supported, e. g. "*X..."
· otherwise 0.
Bits 4..0 Number of characters, starting with Byte 1
1 1st character to be transmitted
2..31 Subsequent characters
Table 4 Bidirectional channel (DK900 ® Master)
Important! When reading data, the DK900’s response is invalid unless, within Byte 0, Bit 5 =
0, Bit 6 = 1, and unless the toggle bit (Bit 7) has the same state as the toggle
bit within Byte 0 of the data transmitted.
DK900 16