Chapter 4
Configuration
MAN_105G_1.5
Page
46
In the above example, the status register for the block mapping has been automatically
assigned to register 9500.
The rest of the mapping configuration involves the mapping trigger - or what initiates the
mapping message.
Mapping “Triggers”
A block mapping can be “triggered” or initiated by several different methods.
•
By the host device writing to a “trigger register” in the source 105G - the block mapping
message is sent each time the host device writes to the trigger register.
•
By configuring a time period - the 105G will send the block mapping message if this
time period has elapsed since the last message has been sent.
•
By configuring a real-time clock - the 105G will send the block mapping message at the
configured times.
•
By a change-of-state within the I/O block. This can only occur for Write mappings. If a
value in the block changes by more than the sensitivity amount, then the block message
will be sent. You can enter a delay period such that the message is sent after the delay
period.
Combinations of the above triggers can occur - for example, the block mapping message will
be sent if a change-of-state occurs, AND at the configured real-time, AND when the host
device writes to the trigger register.
4.4.2 Host Device Trigger
Each mapping entered is allocated a status register - the register number appears on the right
hand of the Block Mapping display. The structure of these Block Mapping status registers is
shown in Appendix A.
Bit 13 of the status register is the “trigger bit” - if Bit 13 is turned “on”, then the associated
mapping is triggered. When the radio message is sent, the 105G automatically turns Bit 13
“off” again - ready for the host device to trigger the mapping again.
The easiest way for the host device to write to Bit 13 is to write a value of hex 2000 (decimal
8192) to the status register. This value writes “1” into Bit 13 and zeros into the other bits of
