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Object PmaComm (Communication)

Description:
The object enables the communication with other computers (mostly with control computers of PLC type) via Ethernet or via the computer's serial port (COM1, COM2,...).
 
One or more objects PmaCommMsg or PmaCommGroup can be created in the PmaComm object.

This object can be created in objects: PmaRoot, PmaFolder, PmaPrototype. Multiple objects of this type can be created in such objects.

Usage of the PmaComm object requires purchase of the license for the appropriate communication driver - see List of communication drivers.

 
The PmaComm object can be used in the application more times, it can be even configured more times with the same protocol (driver).

For serial link each PmaComm object must have defined another communication port. For example, when one PmaComm object communicates through COM1, then next PmaComm object can communicate for example through COM2 (COM3,..) but it mustn't communicate through COM1.

 
The PmaComm object specifies what port and protocol will be used for the data transfer. Data required for the transfer are then defined in the PmaCommMsg or PmaCommGroup nested objects.
 
PmaCommMsg and PmaCommGroup objects comparation:
- The PmaCommMsg object:
- Is a "low level" object, meaning that the data format in this object is created depending on the communication message type, defined by corresponding protocol. If you want to receive, for example, both registers and counters, then two PmaCommMsg objects must be created because the current protocol does not support receiving both registers and counters in one message.
- Can be used for all drivers except for the PmS7 driver.
- The PmaCommGroup object:
- Compared to the PmaCommMsg object, it is on a higher level, because the data in this object are not depending on used protocol. It is possible, for example, to define data for both counters and registers and the object will intelligently assemble this data into communication messages.
- Can be used for following drivers: PmModbusMr, PmS7, PmSBUS, PmMBus, PmIEC8705, PmMelsecQA, PmMelsecFXS, PmABradleyDF1, PmFatek and PmTeco.

For some drivers the PmaCommGroup object cannot be used based on the principles (e.g. for the PmChar communication driver, because this user defined protocol does not have any general addressing and depends only on the user, what kind of message will be created by the PmaCommMsg object).

This object adopts properties and methods of object PmaObject.
Properties and methods:
ClosePort Close the serial/ethernet port
GetCount Returns the number of transmissions
GetProtParam Returns some values defined in configurators on PmaComm > Parameters page
IsConnected Detects whether Ethernet or serial link is connected
OpenPort Open the serial/ethernet port
SetProtParam Sets values in some configurators on the page PmaComm > Parameters
Properties only for serial link:
BaudRate The baud rate of the serial link
ByteSize The number of data bits of the serial link
Dtr Value of DTR signal of the serial link
Parity Value of the transfer parity of the serial link
Rts Value of RTS signal of the serial link
StopBits The number of stopbits of the serial link
Events:
onConnect Is triggered after the successful connection
onDisconnect Is triggered after the connection is closed
Configuration windows:
Object General information about the object
Content Content of the object in the XML form
Events Definition of object events algorithms
Parameters Communication protocol and parameter setting
Related objects:
PmaCommGroup(Communication data) Definition of the communication data group
PmaCommMsg(Communication message) Format definition of one communication message

History:
Pm9.00.00: Object name changed: PmComm -> PmaComm
PROMOTIC 9.0.4 SCADA system documentation - MICROSYS, spol. s r.o.

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