105U-G Wireless Gateway User Manual
Page 13 © August 2003
♦ real time clock, or
♦ on demand by the host device, by writing to a “trigger register” in the 105G.
Block Write Message
A block write message transmits a consecutive block of register values from one 105G to a
destination 105G. It can be triggered by:
♦ time period, configurable 1 – 4096 sec (1.1 hour), or
♦ real time clock, or
♦ on demand by the host device, by writing to a “trigger register” in the 105G, or
♦ a change-of-state event occurring within the block of I/O registers.
If a block write message has been configured to be transmitted on change-of-state, a “time
window” is configured. When a change-of-state occurs in one of the registers in the block,
the time window will be activated. All changes during the time window will be grouped
together and transmitted as one block write message. That is, the block write message will
not be sent immediately the first change-of-state occurs (unless the time window is configured
to zero), but will be sent at the end of the time window - any other registers in the block that
change during the time window will be sent as part of the same message. The time window
can be configured from 0 – 255 seconds.
1.3.3 “Data Concentrator” Networks
105G units can act as “data concentrator” units to collect I/O from a local network of 105U
wireless I/O modules and pass the I/O on to another 105G as a block.
This type of network reduces the amount of radio traffic and is suitable for systems with a
large number of I/O modules. The system is divided into local sub-networks, each with a
105G unit. The 105U modules transmit their I/O vlaues to the 105G. The 105G then
transfers these values to the “central” 105G using a block transfer which is very efficient
compared to a lot of individual I/O transmissions.
The data concentrator network is different than using the 105G as a repeater. A repeater re-
transmits each message in the same format. A data concentrator collects the I/O values as a
block, and transmits the complete block in one transmission.
TO HOST
DEVICE
NETWORK OF
105U I/O UNITS
105U-G
105U-G
NETWORK OF
105U I/O UNITS
105U-G
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