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5 Functions
5.1 Interfacing with Central control & monitoring system.
GMPC has RS-232 and RS-485 port which applies asynchronous mode for interfacing
with Central control & monitoring system. It is capable to set all parameters about
transmission such as transmission speed for RS-232 and RS-485 port. Because there is
a control signal for modem, it is possible to use external modem via RS-232 port. It is
electrically insulated between the external serial ports(RS-232 or RS-485 port etc.)
and internal electronic circuits to provide accurate environmental condition.
5.2 Interface for I-NET communication
- GMPC has two of serial ports which support multi-connection for I-Net
communication and it is possible to set I-Net address for each devices.
5.3 Synchronization
5.3.1 Synchronizing between GMPC and the remote control system.
GMPC which is set as Time Master receives information about time from the remote
control system and set the timer built-in for the time data received.
- For synchronization, it is capable to use 1[s] or 1[ms] unit one. For more detailed
information refer to section 7.4 “ Synchronization mode.”
5.3.2 Synchronizing between the GMPCs.
By means of broadcasting time data which is stored on the inside timer of Time-master
GMPC, synchronization is carried out among the slaves ones.
All of the slave GMPCs, not selected as the Time-Master, receive time data from the
Time-Master one and synchronize their own timer built-in. The accuracy of
synchronization is within 0.5ms when all of the GMPCs are connected directly.
- There is a separated serial port (RS-485 connection) on the GMPC for this
synchronization .
5.3.3 Synchronizing via I-Net communication
GMPC broadcasts the stored information about time via I-Net serial port frequently so
that it is possible to keep synchronizing all the devices connected on the I-Net network.
For more information about data frame for synchronization via I-Net communication,
refer to Chapter 9.
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