Service manual

CDA70 MODEM DESCRIPTION
16
2.6. Antenna connection
Antenna is connected to the radio data modem via a BNC connector located on the
side panel.
2.7. Power supply
Supply voltage working range of the radio modem is +10.8 to +15.6V dc (12V
accumulator). Current consumption during reception is 190 mA. During transmission, current
consumption depends on the transmission output (1500 mA for 5 W). For proper function, it is
necessary that the power source can supply peak current of 2000mA.
2.8. Ports technical specifications
• RS232
Name of product RS232
Power supply Internal ....
Operating temperature -20 .. +55 C Environment
Storage temperature -20 .. +85 C
Emission EN 55022/B
Immunity ETS 300 342
Standards
Safety EN 60950
Max. operating bus current 15 mA
Max. bit rate 230400 bps
Max. overvoltage ±30 V
RS232 specifications
(EN 1434)
Max. total cable length
(300Bd, 200nF/km)
20 m
• RS485
Name of product RS485
External 10,8 .. 15,6 V
Internal ....
Supply power Max. 30 W
Power supply
Supply current Max. 250 mA
Operating temperature -20 .. +55 C Environment
Storage temperature -20 .. +85 C
Emission EN 55022/B
Immunity ETS 300 342
Standards
Safety EN 60950
Max. devices (each 1,5 mA) 256
Max. bit rate 38400 bps
Overload detection 250 mA
Short circuit strength Permanent
RS485 specifications
(EN 1434)
Max. total cable length
(300Bd, 200nF/km)
1200 m