
Manual 37135C
IKD 1 - Digital I/O Expansion Board
© Woodward
Page 17/41
Receiving Data
The length of a received message is 8 byte. The following format applies:
Byte 0
Byte 1
Byte 2
Byte 3
Receiving MUX
Desired relay status
Acknowledgment, ignore relay
demand, enable
Details see below
Not applied
Byte 4
Byte 5
Byte 6
Byte 7
Not applied
Not applied
Not applied
Not applied
Detail to Byte 1:
Bit 0 = 1:
set relay 1
Bit 1 = 1:
set relay 2
Bit 2 = 1:
set relay 3
Bit 3 = 1:
set relay 4
Bit 4 = 1:
set relay 5
Bit 5 = 1:
set relay 6
Bit 6 = 1:
set relay 7
Bit 7 = 1:
set relay 8
Detail to Byte 2:
Bit 0 = 1:
Acknowledgment (applies only at a change from 0 to 1 and only if the message has been
enabled for minimum two cycles.)
Bit 1 = 1
The content of Byte 1 (desired relay status) is ignored at this message. The relays remain in their
previous status.
Bit 2 = 1
Enable evaluation of the digital inputs (see configuration.)
Bit 3 to 7
≡
0
Start/Stop of Cyclically Transmission of Data Via CAN Bus
Bus
The ID for a start/stop message is always 0.
The length of the message is 2 Bytes.
Byte 0
"1" for start,
"2" for stop.
Byte 1
Node ID
or "0" (common command for all units on the bus).
NOTE
Using configuration different start behaviors can be selected.