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Software/Programming
The SCADA controller is directly connected to RTU 1 by a serial link. The SCADA controller
polls RTU 1, RTU 2, RTU 3, and MODBUS Device 4. The EEPROM configuration for RTU 1
should be:
End
Repeaters RTU TO
1234 ID ID
EEPROM Point # 1 0000 2 2
EEPROM Point # 2 2000 3 3
EEPROM Point # 3 2000 3 4
EEPROM Point # 4 0000 0 0
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 RTU 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.
>>> 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 columns 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:
|--------------- | | . . . . . . .. .. .. .. ..| . . . . . . .. .. |
| SCADA | Serial | RF link 1-2 | RF link 2-3 | Serial |------------|
| Controller link |---------| |-------| |-------| link |Modbus|
| | | RTU | | RTU | | RTU | | Device |
|--------------| | 1 | | 2 | | 3 | | 4 |
| ||||| || | |
|--------------| |------------| |------------| |----------- | |------------ |
( B-10 )
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