6
Digital clocks – NDC Series / User Manual v. 2.11
4
2.7 Power supply
Standard 230 VAC/50 Hz,12 VDC and 24 VDC for extra fee.
2.8 System time network
•
Possibility to create unified time systems in an NDC-net without the necessity to use special master clock.
The unified time network may contain NDC clocks, GPS receiver, a synchronisation time module (Network
Time Server RS485), remote sensors (e.g. of temperature), remote buttons to control stop watch and the
counter and a remote output module (relay), controlled by the so called Master clock (i.e. standard NDC
clock setup as the Master, see below).
•
Adjustable network clock synchronisation interval in the range 0 – 255 min (only the Master clock).
2.9 NDC-net communication network
At the physical level, the communication network is made by an RS485 interface with the baud rate 9600.
Devices with addresses 1 – 127 may be connected to the NDC-net bus, while there must be one NDC type
device with a dedicated address 1 in the function of the Master in the system. The bus negotiation and
communication control is always controlled by the Master device.
Devices connected to the bus may be of the following types:
•
NDC clock – It displays data and, together with a remote controller, provides a user interface for the setting
and controlling of the system. The network must contain one NDC clock with the address set to 1 (Master
clock), which provides the control of the NDC-net.
•
Synchronisation device – its role is to provide precise time to the rest of the devices. The source of that
time may be a GPS signal, DCF-77, a PC, an embedded module with an RS485 line and a protocol
converter to the NDC-net.
•
Sensors – Within the range of the NDC-net they measure general quantities (usually temperature, but also
humidity, pressure,...) and, after their processing, they send the data along the network to NDC devices
for displaying. Data from one of two sensors may be allocated to each NDC clock. The sensor modules
will complement the offer depending on the demand on the market and the development possibilities.
•
Remote buttons – They allow to place buttons for controlling the stop watch and the counter into a longer
distance from the controlled NDC within the NDC-net.
•
Remote access – allows to place the switching relay or an open-collector type output to a longer distance
from the controlling NDC within the NDC-net. This output may be controlled only by the Master clock.
3
DISPLAY ACCESSORIES
Depending on the selected version of the connection of displays, the supply is complemented with the
necessary accessories.
3.1 Standard accessories
Type of display
Standard accessories
NDC 57/4
Power supply cable
flexible 1.5 m.
NDC 57/6
NDC 100/4
NDC 100/6
NDC 160/4
Connector for the
power supply cable.
(Cable is not supplied.)
NDC 160/6
NDC 212/4
NDC 212/6
3.2 Optional accessories
•
Handheld IR Remote Control – for setting clock parameters.
(Parameters such as time, date, on/off time period of each displayed value, brightness, etc.).
•
Temperature sensor – for displaying local or remote temperature (as per type ordered).
•
GPS Time Receiver – for automatic time/date synchronization with GPS
(GPS Timer Receiver cable length can be 5 m or 10 m max., depending on type ordered).
Several modules can be connected to NDC series clocks and to the NDC-net through a communication bus
based on RS485, which communicate with the NDC-protocol. The range of such modules is widened
continually.
