
Chapter 8 ____________________________________________________________ Technical Data
VAISALA______________________________________________________________________ 235
Modem Module
Specifications
Table 54 DMX501 Specifications
Property Description/Value
Modem chip 73K324L
Modem chip crystal
frequency
11.0592 MHz
USART clock frequency 11.0592 MHz / 2
Register access Operated through an 8-bit bus interface
Connection 2-wire
Point-to-point line or
Multidrop modem network
Modem protocols V.21, 300 bps FSK
V.23, 1200 / 75 bps FSK
V.22, 1200 bps DPSK
Line interface Matched to 600 Ω
TxControl signal Configurable
Supply voltage 5 V (+4.75 ... +5.50 V)
Current consumption
Reset / power-down 9 mA
Operation 26 mA
Transmit level -10 dBm
Distance between modules 19 km (~12 mi.) with 26 AWG standard cable
Operating and storage
temperature
-50 ... +70 °C (-58 ... 158 °F)
Humidity 0 ... 100 %RH, non condensing
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