Specifications

RMIS Part No. 500549 Rev. B Page 5
4.0 TWICE (TWO-WIRE) CONTROLLER CAPABILITES
The controller shall utilize a two-wire connection path to each station decoder.
• The Two-Wire path shall support a variety of connectivity configurations including: single
path, dual path, loop, and grid configurations, and combinations thereof.
• The communications along the two-wire path shall be bi-directional between the
controller and each decoder.
• The TWICE Interface module shall confirm station ON commands by receiving an
appropriate response from the corresponding station decoder.
• Station decoders shall intelligently monitor the electrical current at any solenoid and
report any short or open circuit back to the TWICE interface module.
• The TWICE interface module shall display diagnostic error conditions to the operator.
These diagnostic errors shall include:
o E1 - No station decoder found (cannot communicate from the TWICE module to
the designated station decoder)
o E2 - Short circuit on the two wire path
o E3 - Open circuit of a station solenoid
o E4 - Over current due to shorted solenoid
o E5 - Station decoder communication error
o E6 - High temperature shutdown
o E7 – Decoder Programming Failure
• The TWICE Interface module shall allow the user to program the station number into any
decoder.
• The TWICE Interface module shall allow the user to read and display the station number
which has been programmed into any decoder.
• The TWICE Interface module shall allow the user to test the entire two wire network of
decoders and report any error(s) status back to the operator. Errors shall be reported
with appropriate error codes as well as with a STATUS diagnostic LED.
• THE TWICE Interface shall allow the user to test any single station for proper operation.
Any error condition shall be reported in the display. When the station test is successful,
the display shall report the firmware version of the decoder followed by the electrical
current drawn by the solenoid.
• The TWICE Interface module shall automatically display the STATUS of each valve via a
diagnostic LED when operating in the AUTO mode. Stations that are irrigating properly
(communicating with the appropriate decoder and having a nominal electrical current
draw on it solenoid) will illuminate the STATUS led with a green color. Otherwise the
station has an error and will illuminate the STATUS led with a red color. When no
irrigation stations are on, the display will display any station(s) which may have had an
error condition. The display will rotate with erred stations until the operator clears
them.
• Station decoders shall be available in 1, 2, and 4 output varieties.
• The TWICE interface module shall allow for a maximum of 36 stations plus one Master
Valve.
• The maximum distance from the controller to any decoder shall be limited to 5,000 feet.
This distance assumes usage of Rain Master’s two-wire 14 (AWG) gauge cable, RMIS Part
No. TW-CAB-14.
• The maximum distance for the two-wire loop configuration, shall not exceed 10,000 feet.
• The maximum distance between any lightning arrestors/ground rods shall be no more
than 600 feet.