6 DCP Interface
YASKAWA TOEPC710616134G AC Drive L1000A Technical Manual Addendum 25
■ Communication Bytes
Process Data Communication Data Checksum
1 2 3 4 5 6
Status Byte
(S7 ... S0)
Data Byte 1 Data Byte 2 Communication Byte 1 Communication Byte 2 Checksum
Refer to DCP Communication Data Channel on page 25.
■ Checksum Byte
Process Data Communication Data Checksum
1 2 3 4 5 6
Status Byte
(S7 ... S0)
Data Byte 1 Data Byte 2 Communication Byte 1 Communication Byte 2 Checksum
The checksum is the result of an XOR operation across all 5 data bytes. The resulting value must be equal to the
checksum, i.e. an XOR operation across all 6 bytes must yield 0.
◆ DCP Communication Data Channel
The communication data channel is embedded in the DCP frame and operated by its own protocol.
Process Data Communication Data Checksum
1 2 3 4 5 6
Status Byte
(S7 ... S0)
Data Byte 1 Data Byte 2 Communication Byte 1 Communication Byte 2 Checksum
It allows:
• Access to all desired drive controller monitors and parameters
• Drive remote control using keypad and display of the lift controller
• The exchange of additional data between lift controller and drive controller
■ Character Set
Data within the communication data channel is only transferred using ASCII characters.
• The transmitted characters are limited to the ASCII character set from 20 to FF (Hex).
• The remaining 32 characters are available for control purposes (0 to 1F (Hex)).
This offers advantages, especially for remote diagnostics, since an ASCII protocol can be easily integrated into a
standardized data frame.
■ Data Transmission and Character Format
Since only ASCII characters from 20 to FF (Hex) are available for data transmission, it must be insured that no
character outside this range occurs within the data stream as this would result in malfunctions.
An effective method of avoiding such problems is to convert the data bytes into ASCII format in order to ensure
that they lie outside the range of control characters. This method offers the opportunity of an additional
plausibility check to pick up transmission errors not detected by calculating the checksum (e.g. 2 bits falsified).
The transmitted data is encapsulated in the 6-byte DCP data frame.
STX
Start Character
...
...
User Data
...
ETX
Stop Character
■ Data Transmission Time-out Control
If messages are not exchanged within one second, the communication devices on both ends are automatically reset
to their initial state.
If there is no "ETX" character received within one second after an "STX" character was received, the
communication data channel is also reset to its initial state.
■ Control Modes
The communication channel can be operated in the following modes:
EN
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