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>>> RTU PROGRAMMER VERSION 3.03 HELP FILE<<<( continued)
3.1
EEPROM SCADA Points
Four SCADA points can be stored in EEPROM. If power to the RTU is
temporarily lost and then returns, the EEPROM points will not be lost. The
repeater c o lumns list, in order, the repeaters between this RTU and the end RTU.
The to ID is the RTU or other MODBUS device which the SCADA program will
request information from. If the to ID is an RTU, the to ID and end RTU will be
identical. If the to ID is another MODBUS device, the end RTU must be directly
connected to the MODBUS device by a serial link.
Example 4:
1 --- -------1
I SCADA
I Serial
!Controller link 1-----1
I
1---1
1- - - -- - - -- - 1
I
I
1 - - --- - ---- 1
The SCADA controller is directly connected to RTU I by a serial link. The
SCADA controller polls RTU I, RTU 2, RTU 3, and MODBUS Device 4. The
EEPROM configuration for RTU 1 should be:
In the previous example, there are no repeaters between RTU 1 and RTU 2. If
the SCADA controller polls RTU 2, the last RTU in the path is RTU 2. If the
SCADA controller polls RTU 3, then RTU 2 acts as a repeater. The last RTU is
R TU 3 Entry number 3 is the same as entry number 2 except that the final
address is MODBUS device 4. RTU 3 is the end RTU. It transmits the message
to the MODBUS device serially.
( B-10)
Software/ Programm
I
f
------------------------------------------------1
EEPROM Point# 1
EEPROM Point# 2
EEPROM Point# 3
EEPROM Point# 4
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I . . . . . . . · I · · · · · · · · I
I RF link 2 - 3
I RF link 1-2
1- -- - - 1
I
I
I 2 I
I 1 I
I
I
I
1 --- -- 1
1 - - - --1
RTU
RTU
I
I
Repeaters
1 1
2
3
I
O
O
O
I
2
0
0
I
2
0
0
I
O
O
O
I Serial 1 - -- - --1
1--- - -1 link
I
I
I
I 3
I
I
I
I
1 -- - - - 1
RTU
I
I
I
End
I
I
I
R'I'U
TO
4 f:tD l:tD I
I
I
I
O
2
2
I
I
I
3
3
0
I
I
I
4
0
3
I
I
I
O
O
O
IModbusl
!Device!
I 4
I
I
I
1 - -- - -- I
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