Varec 8300 series, Installation And Operation Manual, Page: 44 / 150

Software Description Tank Gate Interface
34 Installation and Operations Manual
Application
The EMUGW point is automatically created when the TankView (TSU Slave) protocol is initiated.
In order to use the TSU Slave protocol, set the Protocol parameter of the COM point to TSU Slave.
At that time, an EMUGW and an EMU point will be created to provide a user interface for
configuration and control of communications with TankView or System IV. The baud rate and
data link parameters are set in the COM point as well. The default is 9600, 8 data bits, No parity.
The EMUGW point keeps track of the number of requests and number of errors associated with
the EMU Slave protocol. The current tank number (ID) and the point associated with the tank
number (LevelRef) are updated as requests from TankView are processed. The PntRefs correlate
to the SYS ADR parameter in TankView or IDs in System IV.
4.4.6 Gateway Block (GWBLK)
The Gateway Block point is used for compatibility with Modbus Master devices.
Rather, you configure a GWBLK to function as a look-up table. The GWBLK point lets
you specify which point references will respond to data addresses in the request
from a Host. The GWBLK point contains a cross-reference table for database
parameters and data addresses.
Parameters
The database parameters used by the GWBLK point are listed and described below:
Elaspe Time of last request
PntCheckSum CRC-16 Checksum for point’s static Configuration Parameters.
Dynamic Parameters Function
Configuration Parameters Function
Tag A Tag can contain 15 bytes of data and can include any printable ASCII
character. Tags can be used to identify points indicating the use of the
point such as “Modbus Slave” or “Register Value1.”
The default tag is set to “GWBLK.00”.
Protocol Protocol that the GWBLK point is used with. Valid values are:
Modbus Slave
ComPort Bit mask to enable address referencing. If a bit corresponding to the com
port, then address referencing is enabled for the channel.
The default is 0xFF (all COM ports).
DataMode Integer HEX value that controls the data returned to a Modbus Host
0: Use parameter values
0x01: Convert to Integer
0x02: Return 0xFF if the data is invalid.
0x04: Convert to Integer using only the Scale
If the DataMode is 0x01, the PntRef data will be converted to an integer
using the Offset, Scale, ValueMin and ValueMax. If the DataMode is 0x04,
the Scale parameter is used to convert to an integer.
RegSet Register Set size
Offset Input range Offset used for scaling the output to an integer value when
DataMode=1.
Scale Input range Scale used for scaling the output to an integer value when
DataMode=1.