INSTEON Hub: Developer’s Guide
Page 25 © 2013 INSTEON
Set INSTEON ACK Message Two Bytes
Set INSTEON ACK Message Two Bytes (0x71)
What it does Allows you to put two bytes of data into the combined Command 1 and Command 2 fields of the
INSTEON ACK message that the INSTEON Engine automatically sends after it receives an
INSTEON Direct message.
What you send
4 bytes.
What you’ll get
5 bytes.
LED indication
None.
Related Commands
IM 0x50 INSTEON Standard Message Received
22
IM 0x51 INSTEON Extended Message Received
23
IM 0x68 Set INSTEON ACK Message Byte
24
IM 0x70 Set INSTEON NAK Message Byte
26
Command Sent from Host to IM
Byte Value Meaning
1 0x02 Start of IM Command
2
0x71
IM Command Number
3 <Command 1 Data> Data byte to place into the Command 1 field 2 of the ACK response.
4 <Command 2 Data> Data byte to place into the Command 2 field 2 of the ACK response.
Message Returned by IM to Host
Byte Value Meaning
1 0x02 Echoed Start of IM Command
2
0x71
Echoed IM Command Number
3 <Command 1 Data> Echoed <Command 1 Data>
4 <Command 2 Data> Echoed <Command 2 Data>
5
<ACK/NAK>
0x06 (ACK) if the IM executed the
Command correctly.
0x15 (NAK) if an error occurred.
Notes
You have only about 15 milliseconds after the receipt of an INSTEON Direct message from the IM to
send this Command to the IM. The reason is that the INSTEON Engine in the IM automatically sends
Acknowledgement messages in assigned timeslots.
Use Set INSTEON ACK Message Byte
24
when you only need to return one byte of data in an ACK
message.
Use Set INSTEON NAK Message Byte
26
when you need to return one byte of data in a NAK message.
Certain INSTEON Direct Commands require returned data in the Acknowledgement message. For
more information on INSTEON Commands and the latest Command set, please download the current
INSTEON Command Tables Document
2
from http://code.insteon.com.
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