Nuova Marea NM 251 Series User manual

NM-251D-ZDA
ZDA Filter/Converter
User Guide
V1.00
Introduction
The NM-251D-ZDA is a part of the NM-251 Series family and is programmed to function as a G S signal
filter/converter that produces the $G ZDA sentence from any G S capable of transmitting the $G RMC string. The
NM-251D-ZDA is designed to be used for interfacing a G S that does not transmit the $G ZDA sentence with systems
such as the VDR or ECDIS that require the time and date to be processed from the $G ZDA string only. The produced
$G ZDA sentence is appended to the rest of the transmitted G S strings and distributed to each of the five buffered
output ports.
peration
The NM-251D-ZDA acquires the NMEA-0183 sentences from the first input port only. If the string is not the
$G RMC it is immediately transmitted to the five outputs ports. In the case that a $G RMC sentence is received the
NM-251D-ZDA processes the time and date data and produces the $G ZDA string. Both the $G RMC and $G ZDA are
then transmitted to the five buffered outputs. If no $G RMC sentence is received the NM-251D-ZDA functions as a
pass through one to five channel NMEA-0183 multiplier.
nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
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Input Port (listener)
The NM-251D-ZDA has one input port enabled that can be connected to any G S capable to output NMEA-
0183 signals. The input port is optoisolated as specified in the NMEA-0183 protocol, thus the data(-) pole should
never been connected to the NM-251DZDA ground. If the G S talker port is single ended, connect that terminal to the
Ina(+) and tide the Ina(-) to the instrument’s ground. If a RS-232 signal level is connected, the ground pole (GND)
should be connected to Ina(+) and the data pole (TXD) to Ina(-).
The NM-251D-ZDA input port can acquire NMEA sentences carried in TTL, RS-232 and RS-485/422 signal
levels.
utput Ports (Talkers)
Each of the four general purpose talker ports transmit the NMEA sentences in both RS422 and TTL signal
levels, depending on the connection topology chosen (see figure 1, 2 and 3), and can fan out one instrument. Current
drawn from every port can be up to 20mA, efficient enough to drive any NMEA compatible instrument.
The RS-232 port can deliver NMEA sentences to any modern computer running the appropriate software on
Windows 98 and above provided that the serial communication follows the 4.800/8/N/1. This port is not optically
isolated and should be used for testing purposes only to avoid DC leakage. It can be used though to interface a
computer system if proper isolation is achieved or if the computer is supplied from an isolated power supply.
The Out5 port has two functionality modes that can be selected via jumper J6 located inside then NM-251D-
ZDA (see figure 4). By shorting poles 1-2 on J6, Out5 converts the signals received from the computer to RS-422
signal level. By shorting the poles 1-3 on J6, Out5 is configured as a fifth output of the NM-251D-ZDA.
The NM-251D-ZDA can be connected as shown in figures 1,2 and 3 using all RS-422 outputs (figure 1), all TTL
outputs (figure 2) or using either the RS-422 or TTL output of each port taking care not to connect the same port for
both signal level outputting.
Figure 1: Connection to RS-422 Outputs
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marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
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Figure 2: Connection to TTL outputs
Figure 3: Combined use of TTL and RS-422 outputs
nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
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Power Supply
The NM-251D-ZDA can be powered within the range of 10-35 VDC. The nominal voltage of 24 Vdc is advised
for powering the device in normal operation.
ower input port has a protection for incorrect polarity connection of the supplying voltage.
LED Indicator sequence
Inb LED ON: The NM-251D-ZDA is in operation mode processing the $G RMC strings
OFF or ON/OFF: Uploaded firmware not correct or NM-251D-ZDA malfunction
Ina LED
Out 3/4 LED Flashing indicates data transmission to output port 3 and 4
Out 1/2 LED Flashing indicates data transmission to output port 1 and 2
Out5 LED Flashing indicates reception from RS-232 port and transmission to Out5 port
Printed Circuit Board composite layout
Figure 4: Composite layout of NM-251D-ZDA printed circuit board
nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
Web: http://www.nuovamarea.com e-mail: [email protected]

Specifications
Supply Voltage 9 to 35 Vdc
ower Supply rotection TC Resetable Fuse
Vmax: 60V, Imax: 40A, Ihold: 0,25A (23°C),
Itrip:0,5A (23°C), Max time to trip (23°C): 2,2sec for 1,25A
Current Consumption 50mA in idle state/ 150mA in full output mode
Inputs 1 x NMEA-0183, optically isolated
Common Mode Rejection: 10kV/usec, Isolation: 480 Vrms
Input Resistance 1,5 KOhm
Outputs 4 x buffered RS-422/TTL (general purpose)
1 x RS-232
1 x RS-422 signal conversion from RS-232 RXD channel or as fifth output
Output protection Buffered for all RS-422 outputs
Speed for NMEA inputs •4.800/8/N/1 when
input priority encoding mode is selected
Speed for NMEA outputs •4.800/8/N/1 when
input priority encoding mode is selected
Indicators Functionality mode (Ina)/ (Inb)
Data transmission from output ports 1 and 2 (Out 1/2 LED)
Data transmission from output ports 3 and 4 (Out 3/4 LED)
Data reception from RS-232 interface or output 5 port (Out 5 LED)
Dimensions Width = 110mm/134,80 mm
Depth = 82 mm
Height = 43 mm
Housing Styrene
nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
Web: http://www.nuovamarea.com e-mail: [email protected]

Port ID Wire ID / Color Cable ID Signal Description
Vin(+)
GND
Ina(+)
Ina(-)
Inb(+) N/A N/A N/A
Inb(-) N/A
Out1A
Out1B
GND
Out2B
Out2A
Out3A
Out3B
GND
Out4B
Out4A
Out5A
Out5B
SETTINGS
J5* J6* Dip Switches**
2 1 3 2 1 3 ID FF N
1 N/A N/A
* Mark the positions that are occupied by the jumper
** Mark the position for every switch
2 N/A N/A
3 N/A N/A
4 N/A N/A
nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
Web: http://www.nuovamarea.com e-mail: [email protected]
N TES:

nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
Web: http://www.nuovamarea.com e-mail: [email protected]

nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
Web: http://www.nuovamarea.com e-mail: [e-mail]

nuova marea ltd
marine electronics & deign
26, Myrtidiotissis str. Kastella 185-33 Piraeus Greece
Tel [phone] & 30 210 4134698 Fax [phone]
Web: http://www.nuovamarea.com e-mail: [email protected]