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HOPF 7515 communication protocol communicates with the card Mains Voltage Analysis Board 7515 card, which is an optional part of the GPS system HOPF System 7001. The 7515 card 7515 includes the system for measuring and monitoring of the network frequency (between 45 and 65 Hz). The communication is simplexonly one-way. Data are sent via serial line. These data are sent:

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  • Communication line category: Serial, SerialOverUDP Device Redundant, RFC2217 Client.
  • The parameters of the SerialOverUDP Device Redundant line are described here.
    Note: You can configure the IP address and port of the backup device and use the a redundant connection of two HOPF servers.
  • The parameters of the serial line:
    • Baud rate: 9600 Baud
    • Parity: None (none, otherwise according to the setting of the card 7515)
    • Number of data bits: 8
    • Handshaking: none
  • The defined parameters are standard. They may be changed by DIP switches on the a 7515 card 7515).
  • Card The 7515 card directly supports the output to a serial port, or you can use it is possible to use an RS422 interface together with the RS244/RS232 converter.

Kotva
komunikacna_stanica
komunikacna_stanica
Communication station configuration

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  • The communication protocol HOPF Communication protocol: HOPF 7515 Mains Voltage Analysis Board (the  the protocol is described in the instructions of HOPF Large Scale Display 4985 documentation).
  • The station address of station must be 0.


Station protocol parameters

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Table 1

AddressTypeMeaning
0allA The system time that is sent in the format hh:mm:ss format . Depending on the I/O tag type, it contains:
  • Ai, Ci - system time which is converted into seconds (hh*3600 + mm*60 + ss)
  • TiA - system time which also contains a current day, month, and year
  • TiR - system time as an interval
  • TxtI - system time as a received text
1allNetwork time that is sent in the format hh:mm:ss format. This time is calculated from the network frequency (if the frequency is optimal, i.e. 50Hz or 60 Hz, network time is equal to the system one). 
There are the same rules for both the system time and network time.
2TiR,TxtIDifference between the system time and network one.
3Ai,Ci,TxtINetwork frequency in Hz. Depending on the I/O tag type, it contains:
  • Ai - frequency as a decimal number (e.g. 49.998)
  • Ci  - frequency which is multiplied by 1000 as an integral number (e.g. 49998)
  • TxtI - frequency in the format xx,xxx Hz(e.g. 49,998 Hz)
7TiA,TxtISystem time and date that are is sent once a minute. Depending on the I/O tag type, it contains:
  • TiA - time and date
  • TxtI - a received text in the format SWhhmmssDDMMRRXxyy:
    • S - status
    • W - the day of a week
    • hh - hour
    • mm - minute
    • ss - second
    • DD - the day of a month
    • MM - month
    • RR - year
    • Xxyy - hours (Xx) and minutes (yy) of the time difference ( max. +/-12:59 ) between the sending time and UTC. Bit 4 (in tens of hours (X)) indicates a sign. If it is set, a local time overtakes runs ahead of UTC by the defined time difference, e.g. 8130 -> local time at 1:30 a.m. overtakes runs ahead of UTC, 0300 -> local time is 3 hours behind UTC.

    Meaning of the bit status S:

    • bit 1: if 1, announcement hour (the change of winter/summer time will come next)
    • bit 2: if 1, summer time
    • bit 3: if 1, announcement second
    • bit 4: if 1, the time is obtained from GPS; if 0, the time is obtained from an internal source

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