According to the method of the communication we divide Landis&Gyr
regulators into two groups:
of the PRV1
types - communication by means of the PmChar
2nd Landis&Gyr of the PRU1, PRU2 and RWP types - communication by the internal Landis&Gyr protocol.
Both types of the communication have the following in common:
regulators are not addressable
, it goes about the point-to-point
communication type. But it is possible to place a special external converter prior to each Landis&Gyr
that provides addressing and the conversion of the line to the RS485 network communication
Communication is implemented over the programming PG port
. Data in the Landis&Gyr
have no fixed address and even on the relatively small change of the program in the Landis&Gyr
of variables in the Landis&Gyr are changed
. Communication messages that write
into the Landis&Gyr
, can then cause the crash of the program
in the Landis&Gyr
when even tiny changes in the Landis&Gyr
addresses layout are not accepted. This destruction can be non-reversible !!
and even the reset of the Landis&Gyr
will not help !! Thus it is important to know the exact
address layout in the Landis&Gyr
Communication by OPC server by the MC Control company
server from this company is communication driver for devices Landis&Gyr
of the type UNIGYR–RWP80
and PRU2 10.64b
. Regulators can be connected via the computer's serial port RS232
or via Ethernet. OPC
server installer is available on pages http://www.mccontrol.cz
server is protected by HW Key. Without HW Key is server limited for one station for one hour.
Data transfer via RS232 interface:
Data transfer RS232
allows connecting max one station RWP80
connected to serial port. Connecting other station requires new communication port.
Data transfer via Ethernet:
The station is connected through communication converter Ethernet/RS-232
. It is possible to connect more station to one TCP port, address is determined by IP address in the network.
Communication by OPC server for PROFIBUS
It is possible to insert the PROFIBUS
communication card into the controler of the PRU
type. By such controller it is possible to communicate, for example, by the OPC server by the Siemens company
Communication with PRV1 and PRV2 regulators
The communication with the Landis&Gyr
regulators of the PRV1
types is carried out in the PROMOTIC system by means of the PmChar
communication driver. For the network communication (over the RS485
) it is necessary to equip each Landis&Gyr
station by the addressable HW converter.
regulator can be programmed
as the communication Slave
(i.e. it waits for communication prompts=messages from the PC). This is the most often and recommended case how to implement the communication of an application with the Landis&Gyr
stations. The Landis&Gyr
regulator can be programmed as the Master
as well (it transmits data to the communication line itself); or it can go about the combination of both approaches.
As a demonstration of the point-to-point
communication example is available, where the PC is of the Master
type and the Landis&Gyr
station is of the Slave
type. See: Preconfiguration "PmChar - Communication with Landis&Gyr regulators PRV1"
. Example is implemented by the PmChar
with the Landis&Gyr
stations of the PRV1
types can be driven on the RS485
line by intelligent HW converters that provide:
- addressing of the Landis&Gyr regulators.
- security of the Landis&Gyr protocol by the check sum.
- conversion of the RS232 signal to the RS485 - it allows to link up up to 32 Landis&Gyr regulators to one RS485 communication line.
Communication with PRU1/PRU2/RWP regulators by means of DLL library
The communication with the Landis&Gyr
regulators of the PRU1
types is implemented over the RS485
industrial network interface by the addressable HW converter
and the SW communication driver
(DLL library) as follows:
On the Landis&Gyr
station side the communication is carried out over the PG port
). Prior to each Landis&Gyr
station the intelligent HW converter
must be located. The HW converter performs:
- additional addressing the Landis&Gyr stations.
- it ensures communication messages by the checksum.
- it periodically provides current data from the Landis&Gyr station for requests from the PC.
On the PC
side there is available the communication driver
(DLL library). The PROMOTIC system accesses the DLL library by the PmaDll
object and calls its functions (reading the data, data writing, etc.). The communication driver keeps the internal database of variables
. This provides quick answers to PROMOTIC application requests because it doesn't wait for reading the real value from the Landis&Gyr
but the value read from the internal database is returned. For the RS232/RS485 conversion
a suitable external HW converter or a HW card into the PC can be used. On using the HW communication card in the PC the condition of the functionality is the correct detection of the HW card in the Windows OS
(showing new COM
ports in the Windows OS
- The DLL library and the intelligent HW converter (The manufacturer: CODEA, spol. s r.o., Ostrava, Czechia)
- The usage of the PmaDll
object requires purchase of the "PmDllActiveX" licence
. When developing the application in the freeware mode PmFree
, or with development environment
and while testing it in runtime, this component is always functional.