Model 2852

RS-485 OMNINET to Fiber Optic Modem

• OMNINET® RS-485, MODBUS plus

The S.I.Tech 2852 Bit-Driver is designed to work with "Omninet" by Corvus systems using single twisted pair cable. Model 2852 Bit-Driver is a twisted pair to fiber optic transmitter/receiver half duplex product implementing "Omninet" networking scheme. Normal operating data rate is 1 Mbps.

This fiber optic Bit-Driver product eliminates many disadvantages of twisted pair cable, especially EMI/RFI, ground loops (electrical isolation with fiber), high attenuation (high signal loss), limiting distance between nodes of Omninet (2000 feet), and potential lightning damage outdoors between buildings.

S.I.Tech Model 2852 is a standalone product allowing easy change from twisted pair to fiber: Simply disconnect two wires and connect to model 2852 input/output port. Model 2852 comes with power supply and status indicators.

Specifications

Operating Mode:	Synchronous, half duplex, 1 Mbps
Input/Output Interface:	RS-485, 2 wire terminal block (+, -, Ground)
Transmission Line Interface:	2 ST connector fiber optic receptacles (SMA option)
Transmission Distance:	6600 ft. (2.0 Km), (5 Km option)
Transmitter Output Power:	30 microwatts into 50 micron fiber
Wavelength:	820 nanometers (1300 nm option)
Receiver Wavelength:	820 nanometers (1300 nm option)
Minimum Sensitivity:	3 microwatts @ 820 nanometers
Bit Error Rate:	10-9
Operating Temperature:	0°C to 50°C
Input Power:	105 to 130 VAC 60 Hz
Metal Enclosure:	7.5" x 7" x 3" (19 x 17.8 x 7.6 cm)
Weight:	3 lbs. (1.36Kg)
230V Version:	2852V

Operating Distance for Fiber Optic Cable

Optical unit connection: Connect the optical transmission line to the
T and R receptacles. Note which cable channel goes to T or R by noting cable imprint. On the other end, reverse the connection.

Note: Some fiber types in short distance applications may overload the receiver.