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Drive Setup & Adjustments
Byte 8: This byte contains the calculated checksum of the data within this packet. It is the modulo-
256 sum of bytes 1 through byte 7 inclusive.
Demand Velocity Response message from the DSD 412 is as follows:
Byte 1
Byte 2
Byte 3 Byte 4
Sync
Sync
Control
Byte
Byte
Status
FAh
05h
1
These bytes will always be set to FAh and 05h respectively. They are used for
Bytes 1&2:
synchronizing the host to the start of an incoming Demand Velocity Response message from the DSD
412.
Byte 3: {N259_C010} This byte contains 8 logic status signals as defined below:
B0:
=1 to act as a synchronization bit for the host
B1:
=1 to act as a synchronization bit for the host
B2:
0=Tach direction is not UP
B3:
0=Tach direction is not DOWN
B4:
0=No tach overspeed fault
B5:
0=No tach loss fault
B6:
0=No reverse tach fault
B7:
0=No Serial Communications Fault
Byte 4: {N259_C011} This byte contains 8 logic signals to indicate drive faults.
B0:
0=No Motor over-load
B1:
0=No excessive field current
B2:
0=No contactor failure
B3:
0=Drive is not at CEMF limit
B4:
0=E-STOP circuit is closed
B5:
0=No E-STOP fault
B6:
1=No drive fault exists, READY
B7:
1=Drive NOT READY
Byte 5: {N259_C012} This byte contains 8 logic signals to indicate additional faults:
B0:
0=No Loop fault exists
B1:
0=No PCU IST fault
B2:
0=No line synchronization failure
B3:
0=No low line fault
B4:
0=No field loss fault
B5:
0=No Line Droop
B6:
0=Speed Regulator not Released
B7:
Spare
These two bytes contain an echo of the most recent Numeric Command target value
Bytes 6&7:
from the host. The format of the value is identical to that previously defined in the Demand Velocity
message.
Bytes 8-10: These 3 bytes contain ASCII display data normally intended for a serial terminal device
connected to the host. The host should simply pass all non-zero data (displayable ASCII characters)
that it receives in these two slots to the device that is emulating the PCDU. The host may ignore bytes
in these fields if they are set to 00h meaning that the DSD 412 has no data to display at this time. A
full PCDU display is 2 rows of 16 characters. Therefore, an update of an entire screen would require
several packets.
This byte contains the calculated checksum of the data within this packet. It is the
Byte 11:
modulo-256 sum of bytes 1 through byte 10 inclusive.
Byte 5
Byte 6
Control
Control
Numeric
Status 2
Status 3
Data high
byte
1=Tach direction is UP
1=Tach direction is DOWN
1=Tach overspeed fault F97
1=Tach loss fault
1=Reverse tach fault
1=Serial Communications Fault
1=Motor over-load fault F400
1=Excessive field current F401
1=Contactor failure
1=Drive is at CEMF limit F407 or F408
1=E-STOP circuit is open
1=E-STOP fault
0=A drive fault exists, NOT READY
0=Drive is READY
1=Loop fault exists
1=PCU IST fault
1=Line synchronization failure F903
1=Low line fault
1=Field loss fault
1=Line Droop below 90% of nominal F406
1=Speed Regulator is Released
54
Byte 7
Byte 8 Byte 9 Byte 10 Byte 11
Numeric
PCDU
PCDU
Data low
display
display
byte
1
2
F98
F99
F402
F405
F900
F901
F904
F905
PCDU
Check-
display
sum
3
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