Large Decoder Interface (LDI) and Small Decoder Interface (SDI)

SiteControl Only

The LDI/SDI Two-Wire Decoder Interface serves as an interface between the Central Controller and Rain Bird field and sensor decoders on the SiteControl System.

  • Large Decoder Interface (LDI) and the Small Decoder Interface (SDI) serve as an interface between the central controller and Rain Bird commercial field and sensor decoders
  • Rain Bird field and sensor decoders include - FD-101, FD-102, FD-202, FD-401, FD-601, SD-210.
  • LDI can interface with up to 500 decoder addresses and can activate up to 1,000 solenoids (specific performance depends on system design – please consult Rain Bird Decoder Design Guide)
  • SDI can interface with up to 200 decoder addresses and can activate up to 400 solenoids (specific performance depends on system design – please consult Rain Bird Decoder Design Guide)
  • LDI and SDI come standard with terminals for 4 wire paths.
  • Up to 200 total pulse and 200 static (switch) sensors can be set up per system with a maximum of 10 sensor decoders per SDI or LDI (specific capacity on SDI or LDI wire paths depends on system design)
  • Ground the two wire path at the SDI or LDI decoder interface using a Rain Bird MSP-1 surge protector.
  • Ground the two wire path every 500’ using an LSP-1 Line Surge Protector or the LSP-1 that is built into an FD-401 or FD-601 field decoder.
  • All LDIs and SDIs shall be grounded to a 10-ohm or less earth ground.
  • LDI and SDI are UL and CE listed.
  • Flow sensors used in a decoder system do not require the use of a pulse transmitter.
Model NumberDescription
Large Decoder Interface (LDI)
LDITURFLDI North America - interface with up to 500 decoder addresses and can activate up to 1,000 solenoids, includes transformer
ILDITURFLDI International - interface with up to 500 decoder addresses and can activate up to 1,000 solenoids, does not include a transformer
Small Decoder Interface (SDI)
SDITURFSDI North America - interface with up to 200 decoder addresses and can activate up to 400 solenoids, includes transformer
ISDITURFSDI International - interface with up to 200 decoder addresses and can activate up to 400 solenoids, does not include transformers
Domestic (USA) Field Decoders, Sensor Decoders and Surge Protection
FD-101TURFField Decoder interfacing signal line and individual valve
FD-102TURFField Decoder interfacing signal line and valve or one pair of valves
FD-202TURFField Decoder interfacing signal line and 2 valves or 2 pair of valves
FD-401TURFField Decoder interfacing signal line and up to 4 individual valves
FD-601TURFField Decoder interfacing signal line and up to 6 individual valves
LSP-1TURFLine Surge Protection
MSP-1Ground Two-Wire Path at LDI/SDI - Maxi Surge Pipe
SD-210TURFSensor Decoder interfacing signal line and analog or digital decoders
International Field Decoders, Sensor Decoders and Surge Protection
FD-101GOLFField Decoder interfacing signal line and individual valve
FD-102GOLFField Decoder interfacing signal line and valve or one pair of valves
FD-202GOLFField Decoder interfacing signal line and 2 valves or 2 pair of valves
FD-401GOLFField Decoder interfacing signal line and up to 4 individual valves
FD-601GOLFField Decoder interfacing signal line and up to 6 individual valves
LSP-1Line Surge Protection
MSP-1Ground Two-Wire Path at LDI/SDI - Maxi Surge Pipe
SD-210Sensor Decoder interfacing signal line and analog or digital decoders

LDI Electrical Specifications

  • Input: 220, 230, 240VAC ± 10%, 50Hz
  • Output: 24VAC @ 3.12A 50Hz

SDI Electrical Specifications

  • Input: 220, 230, 240VAC ± 10% @ 0.36A 50Hz
  • Output: 24VAC @ 2A 50Hz

LDI & SDI Dimensions

  • Width: 9 ½" (24,1 cm)
  • Height: 10 ¼" (26 cm)
  • Depth: 4 3/8" (11,1 cm)

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