MX500 CDU Inputs and Outputs:
The input and output circuits of the serial interfaces meet
the requirements of:
IEC 61162-1 including the requirements of ITU-T V.11. •
NMEA 0183 version 1.5, 2.0, 2.1, 2.2 & 2.3 •
NMEA talker (all outputs):
Levels: Maximum ±6 volt, minimum ±2 volt, A out rela-
tive to B out
Current: Minimum 15mA
Protection: -1 volt to +6 volt, output relative to shield,
±50 volt, output relative to external power lines
NMEA listeners (all inputs):
Insulation: Opto-coupler. Maximum ±50 volt, input rela-
tive to shield or power supply lines
Impedance: Minimum 500 Ohms, A- in relative to B- in
Threshold: Maximum 2 volt and 2 mA
Protection: ±15 volt, A- in relative to B- in, ±50 volt
MOB/ Event input
Insulation: Maximum ±50 volt, input relative to power
supply lines
Impedance: 3.5 kOhm input relative to Reference GND
Pull-up: 15 kOhm to internal 12 volt
Threshold: Positive going maximum 2.3 volt, input rela-
tive to Reference GND
Negative going minimum 0.6 volt, input relative to
Reference GND
Hysteresis minimum 0.6 volt
Protection: ±25 volt, input relative to shield
±50 volt, input relative to external power lines
Frequency: Triggered with 50 mS bounce control
Pulse width: Minimum 100 mS
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