Chapter 9 ____________________________________________________________ Technical Data
VAISALA______________________________________________________________________ 131
Modem Module DMX501
Table 30 Modem Module DMX501 Specifications
Property Value / Description
Data rate 300, 1200, 2400 bps
Modem standards supported V.21, V.22, V.22bis
Supply voltage 5 V (+4.75 V to 5.5 V)
Current consumption Reset / power-down 9 mA, operation 26 mA
Modem chip crystal
frequency
11.0592 MHz
USART clock frequency 11.0592 MHz / 2 (Modem xtal freq. divided by
2)
Line interface
Matched to 600
Max. operation distance 10 km (approx. 6 miles)
Transmitter Specifications
Table 31 Transmitter Specifications
Property Description / Value
Laser source Indium Gallium Arsenide (InGaAs) Diode Laser
Center wavelength 910 ± 10 nm at 25 °C (77 °F)
Operating Mode Pulsed
Nominal pulse properties at full range measurement:
Energy 1.2 µWs ± 20 % (factory adjustment)
Peak power 11 W typical
Width, 50 % 110 ns typical
Repetition rate 10.0 kHz
Average power 12.0 mW
Max Irradiance 760 µW/cm² measured with 7 mm aperture
Laser classification Classified as Class 1M laser device in
accordance with IEC/EN 60 825-1 Complies
with 21 CFR 1040.10 and 1040.11 except for
the devations pursuant to the Laser Notice No.
50, dated July 26, 2001.
Beam divergence ±0.4 mrad x ±0.7 mrad
Receiver Specifications
Table 32 Receiver Specifications
Property Description / Value
Detector Silicon Avalanche Photodiode (APD)
Surface diameter 0.5 mm (0.02 in.)
Receiver bandwidth 3 MHz (-3db)
Interference filter Center wavelength 915 nm typical
50 % pass band 36 nm
Transmissivity at 913 nm 80 % typical
Field-of-view divergence ± 0.83 mrad
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