User manual

Chapter 1 Introduction
Page 17 ©February 2009
♦ 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.
1.3.4 105G Repeaters
Any 105U module can
repeat a normal radio
message, however only
105G modules can repeat a
block message. 105G units
connected to a host device
can also act as a repeater
for other modules.
Where a 105G is being
used without a host device
as a repeater or data-
concentrator, it can be
configured as “Repeater-
only”. This allows the RS232/485 port to be used for on-line diagnostics. If the unit is a 105G-
MD1, the “Repeater-only” configuration also allows this module to connect to serial I/O
modules.
TO HOST
DEVICE
NETWORK OF
105U I/O UNITS
105G
105G
NETWORK OF
105U I/O UNITS
105G