ProSoft Technology 5202-DFNT-GRCM4 - Manual (Page 4)

2 Functionality
This section describes the functionality of the GRCM driver.
2.1 Data Flow
The following diagram displays receive and transmit dataflow of the GRCM driver.
Data received from the GRC device is accepted by the receive driver and placed in the receive
database location. The receive driver starts saving the characters when a character is received.
The receive driver waits until a termination character is recognized while receiving the data before
placing the new data into the database.
The LF character is used as the termination condition for a received message. This signals the
end of the message. When the receive driver observes this character in the input stream, it takes
all received characters, processes them, and places them in the internal database according to
the command and parameters types returned.
The data flow for configuration data from an external device to the GRC device is also shown in
the previous diagram. When the configuration driver is triggered, it copies the data in the internal
database into the transmit buffer and sends the new data to the GRC device.
ProLinx Communication Gateways, Inc. 4
06.PLNX.GRCM.OO.01.EN
July 2003