User manual

NMEA Data Multiplexer - NDC-4
Page 19© 2011 Active Research Limited
Specications
TheNDC-4ISO-DriveoutputisaveryexibleoutputthatisRS485,RS232,RS422andNMEA0183compatible.
Parameter Conditions Min. Max. Unit
Supply
Supply voltage External power supply 8 35 V
Supply current from external source
(see note 1)
Supply voltage = 12v 30 40 mA
Supply voltage = 24v 15 20 mA
Supply voltage USB powered 4.75 5.25 V
Supply current from USB (see note 1) Supply voltage = 5v 67 75 mA
Opto-isolated Flexible Input
Inputvoltagebetween+/-
Logical‘1’/stopbit -15.0 0.5 V
Logical‘0’/startbit 4.0 15.0 V
Input current
Maximum is under +35v overload
condition, Min @ 2.0v input level
1.6 9.0 mA
Differential input voltage RequiredlevelforNMEAtobedetected 1.8 2.0 V
Galvanic isolation Between input & output 2500 V
Overdrive protection 40 V
Input Baud rate (ports 0 & 1 + USB) CongurableBaudrate 4800 115200 bps
Input Baud rate (ports 2 & 3) CongurableBaudrate 4800 57600 bps
Input Baud rate (port 4) Fixed Baud rate 4800 4800 bps
ISO-Drive Flexible Output
Output voltage between ISO Out +/A and
ISO Out -/B (under no load)
Logical ‘1’ -4.6 -5.0 V
Logical ‘0’ 4.6 5.0 V
Output current at max load of 100 ohm
At maximum load, differential drive
voltage reduces to 2.1v
- 21 mA
Output short circuit current (note 2) Due to short circuit protection 50 55 mA
Galvanic isolation From Opto input and (USB) ground 1500 V
Output Baud rate (ports 0 & 1 + USB) CongurableBaudrate 4800 115200 bps
Data propagation delay Under no-overload conditions 1.0 100 ms
General
Ambienttemperature -20 +70 °C
Guarantee Extended Actisense guarantee - 3 Year
Gland clamping range Cablediametersaccommodated 4.5 10 mm
IP Rating IP66
Table 2 – NDC-4 Specications
Allspecicationsaretakenwithreferencetoanambienttemperature(TA)of+25°C.
Notes:
1. Current consumption measured under no-load conditions.
2.Short circuitmaybe appliedindenitely.The ISO-Driveoutputmay beshort-circuiteddirectly toa30 voltbattery
supplywithoutdamage.Amaximumcurrentof50mAwillowdueto“polyfuse”auto-resettingfusetechnologybeing
used in each output.