NMEA Data Multiplexer - NDC-4
Page 19
© 2015 Active Research Limited
Specifications
The NDC-4 ISO-Drive output is a very flexible 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 b/-
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)
Configurable Baud rate
4800
115200
bps
Input Baud rate (ports 2 & 3)
Configurable 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)
Configurable 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 Specifications
All specifications 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 indefinitely. The ISO-Drive output may be short-circuited directly to a 30 volt battery
supply without damage. A maximum current of 50mA will flow due to “polyfuse” auto-resetting fuse technology being
used in each output.
Summary of Contents for NDC-4
Page 2: ......
