Talgil Computing and Control LTD RF-MODULE-45 사용자 설명서
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03
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Before being able to use the RTU there are some necessary settings to be done:
Setting the address of the RTU
Setting the polling rate by which the MASTER is communicating with
the RTUs
the RTUs
Setting the layer of the RTU. The layer defines whether the RTU
communicates directly with the MASTER or through a REPEATER.
(See below the explanation about repeaters).
communicates directly with the MASTER or through a REPEATER.
(See below the explanation about repeaters).
For RTUs serving as repeaters, it is necessary to define the number of
RTUs that are serviced by the repeater.
RTUs that are serviced by the repeater.
Setting the communication frequency. In the old generation the
frequency setting could only be done at the SLAVE board. Starting
from GIII the frequency can be set at the BASE board as well,
therefore the source of frequency need to be selected.
frequency setting could only be done at the SLAVE board. Starting
from GIII the frequency can be set at the BASE board as well,
therefore the source of frequency need to be selected.
2.4.1 Setting the RTU address
SW1-
Defines the address of the specific RTU. The addressing uses binary notation
(see Appendix A about the binary to decimal conversion). Each RTU must have its
own unique address in the range 1 to 60. However the selection of the address
must obey some rules depending on the polling rate and the use of REPEATERS
as explained below.
own unique address in the range 1 to 60. However the selection of the address
must obey some rules depending on the polling rate and the use of REPEATERS
as explained below.
2.4.2 Defining the polling rate
SW4
- Defines the polling rate (known also as scanning rate) by which the MASTER
is communicating with the RTUs. The setting of the polling rate should be identical
in all RTUs and equal to what has been defined at the host controller. The selection
of the scanning rate is not totally free, it must take into consideration the total
number of RTUs that need to be scanned, or more accurately the highest address
to be scanned. The following table shows what will be the highest address
recognizable at any scanning rate selected, and the combination needed at SW4 for
selecting each polling rate.
in all RTUs and equal to what has been defined at the host controller. The selection
of the scanning rate is not totally free, it must take into consideration the total
number of RTUs that need to be scanned, or more accurately the highest address
to be scanned. The following table shows what will be the highest address
recognizable at any scanning rate selected, and the combination needed at SW4 for
selecting each polling rate.
SW4
– pos 1 pos 2 The polling rate (sec)
Highest RTU address
0 0
10
60
1 0
5
31
0 1
2.5
15
1 1
1.25
7
2.4.3 Setting the layer
SW5-
Defines the layer to which the specific RTU belongs. RTU that communicates
directly with the Master without going through a REPEATER is said to belong to
layer “0” and those that communicate through a REPEATER belong to layer “1”.
The directly communicating RTUs will have SW5
layer “0” and those that communicate through a REPEATER belong to layer “1”.
The directly communicating RTUs will have SW5
set to “00”, and RTUs that
communicate via a REPEATER will have SW5
set to “10”.