1761-6.5
8-6
Explicit Messaging (DNI Series B Only)
The size specified in the DNI’s profile register is in bytes. The data being
sent by the controller is in words. In this example N7:0 contains the profile
register to be used (241). Location N7:1 contains the data to be sent to the
light tower. The message instruction setup screen is shown below.
The actual data portion of the controller’s write message (N7:1) must match
the size parameter in the respective profile register. In this example:
•
the size of profile register 241 is 1
•
the controller’s write message has a length of 2
- the first word identifies the profile register to be used
- the second word is the actual data
To verify that this is a valid routing profile, we see that the data portion of
this message is 1, which corresponds to the profile’s size of 1. So, this
example is valid. If the sizes do not match, the controller’s write message
will result in an error.
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