MJ-4 Communications Module
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10 Specifications
This section contains the MJ-4 Communications Module specifications. Contained in this section are the parameters
for both the fiber optic and RS-232/485 interfaces. The data provided in the fiber optic section was obtained using
62.5/125 µm cable. Typical, maximum, and minimum lengths are given for normal and long range cable lengths.
Except for the maximum and minimum parameters, the numbers provided are for room temperature. The maximum
and minimum lengths are for temperature extremes.
10.1 Physical Dimensions
Height 8.4 inches ( 21.34 cm )
Width 2.89 inches ( 7.34 cm )
Depth 2.84 inches ( 7.21 cm )
10.2 Fiber Optic Link Interface Specifications
Transmitter Jumper J12 In Jumper J12 Out
Maximum Output Power -13.0 dBm (Long Range) -16.0 dBm (Normal Range)
Typical Output Power -16.0 dBm (Long Range) -19.0 dBm (Normal Range)
Minimum Output Power -20.0 dBm (Long Range) -23.0 dBm (Normal Range)
Numerical Aperture 0.49
Optical Port Diameter
290 µm
Receiver
Peak Input Power Logic Level Low -24.0 dBm Min to -9.2 dBm Max
Peak Input Power Logic Level High -40.0 dBm Max
System
Wavelength 820 nanometers (nominal)
Connector Type ST
Fiber Type
Glass 62.5/125 µm, 5dB/m
Data Rate 5 Mbaud (design) 19.2 Kbaud (tested)
Maximum Optical Power Budget 11 dBm (Long Range) 8 dBm (Normal Range)
Typical Optical Power Budget 8 dBm (Long Range) 5 dBm (Normal Range)
Minimum Optical Power Budget 4 dBm (Long Range) 1 dBm (Normal Range)
Link Lengths
Maximum Link Length 2.2 km (Long Range) 1.6 km (Normal Range)
Typical Link Length 1.6 km (Long Range) 0.6 km (Normal Range)
Minimum Link Length 0.8 km (Long Range) 0.2 km (Normal Range)
Operating Temperature Range -40ºC to +85ºC (excluding cable)
10.3 RS-232/RS-485 Interface Specifications
Parameter RS-232 RS-485
Data Rate (maximum) 19200 baud 19200 baud
Distance (maximum) 50 ft 4000 ft
Nodes (maximum) 72 32
Isolation 500 VAC, 1 minute 500 VAC, 1 minute
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