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MODBUS System Set Up
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You may now exit the programming mode or continue with any other configuration
programming that you need to perform on this controller.
Note
The RTU Response Timeout sets the period for which the controller will wait for a
response whenever it polls an individual RTU. A period of 5 to 10 seconds will
normally be adequate; however, if the store-and-forward method is being used, the
timeout period might have to be set to a larger value. This value needs to be the
smallest number of seconds that produces reliable results because it can affect the
total amount of time required to poll all of the RTUs in the system.
RS-232 Watchdog Configuration
The Model 1700 controller has the ability to monitor the RS-232 serial connection for
MODBUS protocol queries. If the master fails to send a MODBUS query for a specific
amount of time, the Model 1700 controller will turn on its output number “1”. This output
could be connected to some kind of alarm that would notify the system operator that either
the master itself has failed or the RS-232 connection between the master and the Model 1700
controller has failed.
This feature can be enabled or disabled, and the timeout period set through the Model 1700
controller RS-232 watchdog menu. The default setting is disabled. The range for the timeout
period is 10 to 65535 in seconds (just over 18 hours maximum).
CONFIGURING THE RTUs
Unless an RTU is interfaced directly to the master PC that is running the MODBUS program,
there is no special configuration necessary. The RTU communicates with the Model 1700
and the controller takes care of translating the information received into the MODBUS
protocol format. The same applies to any commands sent from the master PC out to the
RTUs by means of the controller.
If the RTU is to interfaced directly to a serial port on the master PC, then it must have the
optional MODBUS version of the firmware installed. This version of the RTU firmware does
not show any radio configuration options since the RTU communicates directly with the
master PC.
Assign Addresses
The default setting for the RTU address is zero. This should be set to a number between one
and 255 (not the same address as the Model 1700 controller). Each RTU must have a unique
address. See “ADDRESSING THE RTU” on page 16 for more information on setting the
RTU address.
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Страница 60: ...Repair 025 9209K 60 MODEL 1700 SERIES ENCLOSURE OUTLINE 024 0057B...
Страница 61: ...Repair 025 9209K 61 MODEL 1700 SERIES ENCLOSURE INSTRUCTIONS 024 0056D Sheet 1 of 2...
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Страница 72: ...Appendix B 025 9209K 72...
Страница 80: ...Glossary 025 9209K 80...